CN103424170A - Digital indicating balance with anti-cheating function - Google Patents
Digital indicating balance with anti-cheating function Download PDFInfo
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Abstract
The invention discloses a digital indicating balance with an anti-cheating function. The digital indicating balance comprises a circuit module which is connected with a weighing sensor, a 5X5 keyboard, a displayer, a buzzer, a 5.5V-9.6V direct-current electrical source. Voltage signals and data signals displaying weighing weight of the weighing sensor are collected and compared to data standard of an internal storage, cheating information of weight, unit price, money and time and ID number of the digital indicating balance are recorded and stored, the cheating information is transmitted in a wireless manner to realize remote and digital management, and thus, management level of the digital indicating balance is increased.
Description
Technical field
The present invention relates to digital self-indicating scale, be specifically related to that a kind of signal that LOAD CELLS is produced is amplified, A/D conversion, keyboard interface, data output interface, to the monitoring of weighing-up wave, to the cheating information of weighing analyzed, record, and can carry out the digital self-indicating scale of Wireless Data Transmission.
Background technology
At present, the numeral self-indicating scale has become one of modal trade settlement measurement instrument, on market the metering of digital self-indicating scale accurately whether, closely bound up with common people's daily life, yet many illegal retailers always run counter to sincere principle of managing, utilize the conventional digital self-indicating scale not there is the defect of anti-cheating function, use various fraudulent meanses, seek illegal profit.Common digital self-indicating scale cheat method mainly contains:
1, hide and show captions: general digital self-indicating scale has weight, unit price and three display windows of price, some retailers, deliberately with the commodity of stacking on stand, will cover over against client one side's display window, make client not see price, take advantage of client not note, input high unit price and carry out cheat customers; In order to prevent this cheat method, after client can only carefully see the demonstration of three display windows clearly, then settle accounts.
2, the power of impact borrowing is weighed: the retailer throws in the scale pan commodity are heavy, due to impulsive force, makes and shows that weight moment artificially amplifies, and does not wait and settles out, and client also during unsighted demonstration, just picks up commodity offering price; Prevent this cheat method, client can only require the retailer to handle with care, puts after steady and claims.
3, do not allowance for bark and weigh: while buying commodity, some retailer does not allowance for bark operation by digital self-indicating scale, utilizes client to neglect, and commodity are weighed together with the scale pan; Prevent this cheat method, client can only, after taking off commodity, watch the weight of digital self-indicating scale to show.
4, technology cheating method:
(1) the cheating switch is installed: the operator is installed a cheating switch additional in digital self-indicating scale bottom, opens the cheating switch and just becomes the scale of giving short weight; Close the cheating switch, weighing data just becomes normally;
(2) password is set: the operator, as long as press the numeral (password) of several prior settings on numeric keypad, just can make digital self-indicating scale realize normally weighing or giving short weight and weigh;
(3) installing remote device: by wireless remote control, make weighing increase emptily 10%, 20%, 30% and do not wait;
(4) change chip: utilize technological means to change the electronic chip of digital self-indicating scale inside, make the weight ratio actual weight weight weighed up.
The technology cheating is because disguise is strong, easy to operate, and the evidence obtaining difficulty, be the main cheat method of existing digital self-indicating scale.
In order effectively to prevent the cheating of illegal operators, the management method that quality supervision department now adopts mainly contains:
1, with relevant departments' interlock such as industrial and commercial, carry out the associating strike;
2, provide the right-safeguarding counterweight, allow supervision of the masses;
3, utilize instruments such as " anti-digital self-indicating scale remote control cheating devices ", prevent digital self-indicating scale remote control cheating;
4, strengthen digital self-indicating scale maintenance link management, in order to prevent that digital self-indicating scale is reequiped privately, quality supervision department's regulation numeral self-indicating scale must post sealing of quality supervision department, and the maintenace point maintenance of maintenance licence is being arranged;
5, strengthen digital self-indicating scale calibrating and supervision and management;
6, strengthen the professional ethics quality-oriented education to the practitioner, their service behavior of standard;
7, strengthen inspection, improve punishment.
Although administrative authoritys at different levels adopt multiple counter-measure, but because traditional digital self-indicating scale does not have the load cell signal analytic function, also do not have systematic digitizing and remote wireless management function, the minority illegal operators, in order to seek wrongful interests, always on digital self-indicating scale, adopt fraudulent means, administrative authority can not find in time, even there is the people to report, owing to there is no evidence, or the evidence obtaining difficulty, also can't effectively punish illegal operators.Therefore the phenomenon of utilizing the conventional digital self-indicating scale to carry out the technology cheating remains incessant after repeated prohibition, and how effectively to prevent the technology cheating of digital self-indicating scale, improves the management level of digital self-indicating scale, just becomes very urgent.
Summary of the invention
The object of the invention is to: a kind of digital self-indicating scale with anti-cheating function is provided, load cell signal is gathered and analyzed, solve the conventional digital self-indicating scale problem that the cheating information such as number of times, weight, unit price, the amount of money, time are recorded, preserve of can not weighing to cheating, make digital self-indicating scale there is the function of the technology of preventing cheating; In addition, the real-time information of digital self-indicating scale is carried out to wireless transmission, solve the conventional digital self-indicating scale and can not realize with the external world problem of exchanges data, realize long-range and function digital management.
The technology used in the present invention solution is: the signal processing circuit of digital self-indicating scale (the filter amplification circuit A1 of LOAD CELLS, A/D change-over circuit, digital filter circuit, single-chip microcomputer signal processing circuit), battery voltage supervisory circuit, weighing-up wave monitoring and analysis circuit, date time generating circuit, data wireless transmission circuit are made to a circuit module, the external LOAD CELLS of this circuit module, 5*5 keyboard, display, hummer, 5.5V ~ 9.6V direct supply, form the digital self-indicating scale with anti-cheating function.
The circuit of the circuit module of above-mentioned digital self-indicating scale connects as follows:
(A1) be the signal filtering amplifying circuit, enlargement factor is 128dB, external LOAD CELLS, and the voltage signal of input LOAD CELLS, the signal after amplification exports (A/D) D/A converting circuit to;
(A/D) be D/A converting circuit, simulating signal is converted into to digital signal, send (CPU1, CPU2) single-chip microcomputer to process and analyze;
(CPU1) be single chip circuit, external 5*5 keyboard, hummer and display, the keyboard input instruction such as receive unit price, zero clearing, allowance for bark, return, and export unit price, weight, unit, amount of money demonstration data by serial mode, send the verbal cue signal by hummer;
(CPU2) be single chip circuit, gather from the output weight signal of A/D D/A converting circuit and the weight display of CPU1 output, external wireless sending module (RF);
(RF) be wireless transceiver circuit, frequency of operation is 2.4GHz, the cheating information data that wireless sending (CPU2) transmitted, the supervisory instruction that the receiving management system sends;
The date circuit produces year, month, day, hour, min, second signal, meet CPU1, when cheating occurs, the date temporal information is transferred to (CPU2) through (CPU1), (CPU1) adopt the serial mode communication and (CPU2), the date and time of cheating occurs in record;
A2 is battery voltage detection circuit, input LOAD CELLS operating voltage, and the voltage of output is connected to (A/D) D/A converting circuit.
The circuit module packing forms of above-mentioned digital self-indicating scale is dual-in-line, amounts to 24 pins, and pin 1 ~ 12 is I/O1, and pin 13 ~ 24 is I/O2, and I/O1, I/O2 the 1st pin is the DC power anode incoming end, for circuit module provides DC supply, external direct current power supply+5V end, inside connect chip U3 (HX711) the 16th pin, triode VT (8050) emitter, integrated three-terminal regulator block IC (LM1117) the 1st pin (Vin input end) and single-chip microcomputer U2 (EM78P153) the 5th pin, the 2nd pin is unsettled, the 3rd pin is LOAD CELLS DC power supply cathode output end, output+2.5V DC voltage, LOAD CELLS and A/D change-over circuit share a power supply, external LOAD CELLS power positive end, inside connect triode VT (8050) collector and chip U3 (HX711) the 3rd pin (A/D change-over circuit power input), the 4th pin, the 5th pin are respectively the positive and negative signal input part of LOAD CELLS, the voltage range of input is 0 ~ 20mV, the external LOAD CELLS positive signal of the 4th pin output terminal, inside connect chip U3 (HX711) the 8th pin (A channel positive input terminal), the external LOAD CELLS negative signal of the 5th pin output terminal, inside connect chip U3 (HX711) the 7th pin (A channel negative input end), the 6th pin is unsettled, the 7th pin, the 8th pin are battery voltage detection signal positive-negative input end, input voltage range is 0 ~ 40mV, the 7th pin external connection battery voltage detection signal positive pole, inside connect chip U3 (HX711) the 10th pin (B passage positive input terminal), the 8th pin external connection battery voltage detection signal negative pole, inside connect chip U3 (HX711) the 9th pin (B passage negative input end), the clock signal output terminal of the 9th pin for showing that data serial is exported, clocking, external display driver circuit clock signal input terminal, inside connect single-chip microcomputer U1 (PIC16LF873) the 3rd pin, the data output end of the 10th pin for showing that data serial is exported, the demonstration data of the weight after output is processed, unit price, the amount of money, temporal information, external display driver circuit serial data input end, inside connect single-chip microcomputer U1 (PIC16LF873) the 4th pin, the 11st pin is audio signal output terminal, the output language cue, and external buzzer, inside connect single-chip microcomputer U1 (PIC16LF873) the 2nd pin, the 12nd pin, the 13rd pin is earth terminal, make the circuit potential reference point, the negative pole of external power supply, interior connecting resistance R2 lower end, capacitor C 1 negative pole, capacitor C 2 negative poles, capacitor C 3 negative poles, capacitor C 4 negative poles, single-chip microcomputer U1 (PIC16LF873) the 8th pin (VSS), single-chip microcomputer U1 (PIC16LF873) the 19th pin (VSS), single-chip microcomputer U2 (EM78P153) the 11st pin (VSS), chip U3 (HX711) the 5th pin (AGND), chip U3 (HX711) the 14th pin (XI), chip U3 (HX711) the 15th pin (RATE), clock chip U4 (DS1302) the 4th pin (GND), radio receiving transmitting module RF (JF24D) the 10th pin (GND), the 14th pin is+the 3.3V output end of stabilized voltage supply, is provide+3.3V of external circuit power supply, inside connects integrated three-terminal regulator block IC (LM1117) the 3rd pin (output terminal), 15th, 16,17,18,19,20,21,22,23,24 pin totally 10 pins, form 5*5 keyboard signal input end, 15th, 16,17,18,19 pin are the capable signal input part of keyboard, inside connect the 11st, 12,13,14,15 pin that single-chip microcomputer U1 (PIC16LF873) is corresponding, 20th, 21,22,23,24 pin are keyboard column signal input end, inside connect the 16th, 17,18,21,22 pin that single-chip microcomputer U1 (PIC16LF873) is corresponding.
Triode VT (8050) forms series type direct current regulation source with resistance R 1, resistance R 2, capacitor C 1, for external LOAD CELLS provides direct-current working volts; Resistance R 1, resistance R 2 are sample resistance, determine the size of output voltage; Capacitor C 1 is the Voltage-output filter capacitor; Triode VT (8050) is power adjustment pipe, emitter connects the 1st pin of I/O1, input pin for external power supply, base stage connects chip U3 (HX711) the 2nd pin, the 3rd pin of collector connecting resistance R1 upper end, capacitor C 1 positive pole, chip U3 (HX711) the 3rd pin, I/O1, for stabilized voltage supply output pin, output dc voltage+2.5V.
Integrated three-terminal regulator block IC (LM1117) and capacitor C 3, capacitor C 4 form an integrated DC stabilized voltage supply, for single-chip microcomputer U1 (PIC16LF873), clock chip U4 (DS1302) and provide+3.3V of radio receiving transmitting module RF (JF24D) circuit DC voltage, integrated three-terminal regulator block IC (LM1117): the 1st pin (Vin) connects the 1st pin of I/O1; The 2nd pin (GND) is earth terminal, connects the 12nd pin of I/O1; The 3rd pin (Vout) is the regulator block output terminal, output+3.3V DC voltage, connect single-chip microcomputer U1 (PIC16LF873) the 1st pin (MCLR/VPP), single-chip microcomputer U1 (PIC16LF873) the 20th pin (VDD), clock chip U4 (DS1302) the 8th pin (VCC1), radio receiving transmitting module RF (JF24D) the 1st pin (VCC), I/O2 the 14th pin (+3.3V); Capacitor C 3, capacitor C 4 are power filtering capacitor, and capacitor C 3 positive poles connect integrated three-terminal regulator block IC (LM1117) the 1st pin, capacitor C 3 minus earths, and capacitor C 4 positive poles connect integrated three-terminal regulator block IC (LM1117) the 3rd pin, capacitor C 4 minus earths.
Chip U3 (HX711): the 1st pin (VSUP) is the digital power input end; The 16th pin (DVDD) is chip U3 (HX711) interior voltage-stabilized power supply input end, by I/O1 the 1st pin and external power are anodal, is connected; The 2nd pin (BASE) is chip U3 (HX711) interior voltage-stabilized power supply control output end, connects the base stage of triode VT (8050); The 3rd pin (AVDD) is the inner A/D analog power of chip U3 (HX711) input end, connects the collector of triode VT (8050), by I/O1 the 3rd pin, with LOAD CELLS, is connected, and makes A/D change-over circuit and LOAD CELLS use same power supply; The 4th pin (VFB) is chip U3 (HX711) interior voltage-stabilized power supply control input end, connecting resistance R1 lower end, resistance R 2 upper ends; The 5th pin (AGND) is the simulating signal earth terminal, ground connection; The 6th pin (VBG) is reference voltage output terminal, with capacitor C 2 positive poles, joins, and capacitor C 2 is power filtering capacitor, capacitor C 2 minus earths; The 7th pin (INA-), the 8th pin (INA+) be respectively the A channel differential signal-,+input end, connect the voltage signal of LOAD CELLS output by I/O1 the 4th pin and the 3rd pin; The 9th pin (INB-), the 10th pin (INB+) be respectively B channel difference sub-signal-,+input end, connect the voltage signal of battery voltage detection circuit output by I/O1 the 7th pin and the 6th pin; The 11st pin (PD_SCK), the 12nd pin (D_OUT) composition data serial output, the numerical data of weighing in chip U3 (HX711) is sent in single-chip microcomputer U1 (PIC16LF873), the 11st pin (PD_SCK) is clock line, connect single-chip microcomputer U1 (PIC16LF873) the 6th pin, the 12nd pin (D_OUT) is data line, the digital signal of weighing is exported in serial, connects single-chip microcomputer U1 (PIC16LF873) the 7th pin; The 13rd pin (XO), the 14th pin (XI) are the external crystal-controlled oscillation incoming end, and chip U3 (HX711) internal clocking oscillatory circuit need not external crystal oscillator, and the 13rd pin is unsettled, the 14th pin (XI) ground connection; The 15th pin (RATE) is the output data rate control input end, and message transmission rate is 10Hz, ground connection.
Single-chip microcomputer U1 (PIC16LF873): the 1st pin, the 20th pin connect direct supply+3.3V end, the 2nd pin is made output pin, and the output voice signal, by I/O1 the 11st pin external buzzer, the 3rd pin and the 4th pin are made output pin, and the serial ports output information of weighing shows data, and the 3rd pin output clock synchronizing signal, connect I/O1 the 9th pin, and the 4th pin serial output data signal connects I/O1 the 10th pin, by I/O1 the 9th pin, the 10th pin, external display driver circuit, the 5th pin is unsettled, the 6th pin and the 7th pin are made input pin, the digital signal of weighing of receiving chip U3 (HX711) output, the 6th pin is the digital signal serial input terminal of weighing, and connects chip U3 (HX711) the 12nd pin, the 7th pin is the serial synchronous input end of clock, connects chip U3 (HX711) the 11st pin, the 8th pin (VSS) and the 19th pin (VSS) ground connection, the 9th pin (OSC1) and the 10th pin (OSC2) they are the external crystal-controlled oscillation incoming end, internal oscillator (4MHz), and the 9th pin (OSC1) and the 10th pin (OSC2) are unsettled, 11st, 12,13,14,15,16,17,18,21,22 pin are made input pin, with I/O2 the 15th, 16,17,18,19,20,21,22,23,24 pin, join respectively, 11st, 12,13,14,15 pin are keyboard column signal input end, 16th, 17,18,21,22 pin are the capable signal input part of keyboard, external 5*5 keyboard, receive keyboard input signal, 23rd, 25,26 pin connect respectively clock chip U4 (DS1302) the 7th, 6,5 pin, form bidirectional linked list communication between single-chip microcomputer U1 (PIC16LF873) and clock chip U4 (DS1302), the 23rd pin is the synchronizing clock signals output terminal, the 25th pin is the bidirectional data transfers end, the 26th pin is Enable Pin, when the 26th pin (RB5=1) is high level, date, time data that receive clock chip U4 (DS1302) produces, when the 26th pin (RB5=0) is low level, to the data of clock chip U4 (DS1302) tranmitting data register chip U4 (DS1302) initialization, date, time adjustment, the 24th pin is unsettled, the 27th, 28 pin connect respectively single-chip microcomputer U2 (EM78P153) the 14th pin and the 11st pin, form the both-way communication between single-chip microcomputer U1 (PIC16LF873) and single-chip microcomputer U2 (EM78P153), the 27th pin is the synchronizing clock signals line, the 28th pin is the bidirectional data transfers line, data between single-chip microcomputer U1 (PIC16LF873) and single-chip microcomputer U2 (EM78P153) are received, send out and controlled by single-chip microcomputer U2 (EM78P153), when the 27th pin (RB6=0) is electronegative potential, when the 28th pin (RB7=1) is noble potential, receive the supervisory instruction that single-chip microcomputer U2 (EM78P153) forwards, when the 27th pin (RB6=1) is noble potential, when the 28th pin (RB7=0) is electronegative potential, send the information of weighing of practising fraud.
Single-chip microcomputer U2 (EM78P153): the 4th pin (VDD) connects I/O1 the 1st pin, with external power+5V end, is connected; The 11st pin (VSS) ground connection; The 12nd pin and the 13rd pin are made input pin, the input signal of weighing that serial received chip U3 (HX711) produces, the 12nd pin is the digital signal serial input terminal of weighing, connect chip U3 (HX711) the 12nd pin, the 13rd pin is the serial synchronous input end of clock, connects chip U3 (HX711) the 11st pin; The 2nd pin and the 3rd pin are made input pin, the weigh demonstration output signal of serial received after single-chip microcomputer U2 (EM78P153) processes, the 2nd pin shows the digital signal serial input terminal for weighing, connect single-chip microcomputer U1 (PIC16LF873) the 3rd pin, the 3rd pin is the serial synchronous input end of clock, connects single-chip microcomputer U1 (PIC16LF873) the 4th pin; The 1st pin, the 14th pin connect respectively single-chip microcomputer U1 (PIC16LF873) the 28th pin
,The 27th pin, form two-way data communication with single-chip microcomputer U1 (PIC16LF873), receives the cheating information that single-chip microcomputer U1 (PIC16LF873) sends, and to single-chip microcomputer U1 (PIC16LF873), sends supervisory instruction; 5th, 6,7,8,9,10 pins are controlled the sending and receiving of radio receiving transmitting module RF (JF24D) wireless data, and the 5th pin connects radio receiving transmitting module RF (JF24D) the 6th pin (CS); The 6th pin connects radio receiving transmitting module RF (JF24D) the 5th pin (MOSI); The 7th pin connects radio receiving transmitting module RF (JF24D) the 4th pin (SCK); The 8th pin connects radio receiving transmitting module RF (JF24D) the 3rd pin (CE); The 9th pin connects radio receiving transmitting module RF (JF24D) the 2nd pin (MISO); The 10th pin connects radio receiving transmitting module RF (JF24D) the 8th pin (IRQ).
Clock chip U4 (DS1302): the 8th pin (VCC1) is the primary power input end, connects I/O2 the 14th pin (+3.3V); The 1st pin (VCC2) is the standby power supply input end, by resistance R 3, connects I/O2 the 14th pin (+3.3V); The 2nd pin and the 3rd pin are the crystal oscillator incoming end, meet crystal oscillator Y1, and crystal oscillator frequency is 32.768KHz; The 4th pin (VSS) ground connection; The 5th pin (CE) is the function end, controls the data transmission of clock chip U4 (DS1302), and the transmission of data is controlled by single-chip microcomputer U1 (PIC16LF873), connects the 26th pin of single-chip microcomputer U1 (PIC16LF873); The 6th pin is (I/O) data transmission terminal, realizes and single-chip microcomputer U1 (PIC16LF873) bidirectional data transfers, connects the 25th pin of single-chip microcomputer U1 (PIC16LF873); The 7th pin (SCLK) is the synchronizing clock signals input end, connects the 23rd pin of single-chip microcomputer U1 (PIC16LF873).
Radio receiving transmitting module RF (JF24D): the 1st pin (VCC) connects I/O2 the 14th pin (+3.3V); The 2nd pin (MISO) is for receiving data output end, and the supervisory instruction that digital self-indicating scale management platform is sent receives and be transferred to single-chip microcomputer U2 (EM78P153), connects single-chip microcomputer U2 (EM78P153) the 9th pin; The 3rd pin (CE) is the function end, controls radio receiving transmitting module RF (JF24D) sending and receiving, and the sending and receiving state is controlled by single-chip microcomputer U2 (EM78P153), connects single-chip microcomputer U2 (EM78P153) the 8th pin; The 4th pin (SCK) is clock signal input terminal, connects single-chip microcomputer U2 (EM78P153) the 7th pin; The 5th pin (MOSI) is for sending data input pin, and cheating information, battery ANOMALOUS VARIATIONS information that the data of input are single-chip microcomputer U2 (EM78P153) record and preservation, connect single-chip microcomputer U2 (EM78P153) the 6th pin; The 6th pin (CS) is the bus Enable Pin, controlled by single-chip microcomputer U2 (EM78P153), connects single-chip microcomputer U2 (EM78P153) the 5th pin; The 7th pin (NC) is unsettled; The 8th pin (IRQ) is the sending and receiving state flag bit, and when the sending and receiving signal is arranged, single-chip microcomputer U2 (EM78P153) produces interruption, enters wireless data sending and receiving program, connects single-chip microcomputer U2 (EM78P153) the 10th pin; The 9th pin (NC) is unsettled; The 10th pin (GND) ground connection.
The present invention has the following advantages:
1, there is conventional digital self-indicating scale original function;
2, have LOAD CELLS input and output weight information is gathered and analytic function automatically;
3, there is the weigh function of information (cheating weigh number of times, time, weight, digital self-indicating scale numbering) of the cheating of recording and preserve;
4, each digital self-indicating scale has unique No. ID;
5, the function that there is Wireless Data Transmission.
Apply digital self-indicating scale of the present invention and can automatically record and preserve weight, unit price, the amount of money, the cheating information such as time and digital self-indicating scale No. ID, and the information exchange of record is crossed to the short distance wireless communication module send to the data relay platform, the data relay platform is crossed this information exchange network communication (GPRS) again and is transmitted to digital self-indicating scale comprehensive management platform, the numeral self-indicating scale, data relay platform and comprehensive management platform form a complete dynamic digital self-indicating scale management system, and (data relay platform and digital self-indicating scale comprehensive management platform be not in the present invention, therefore be not described).
The accompanying drawing explanation
The circuit module principle of work block diagram that Fig. 1 is digital self-indicating scale of the present invention.
The circuit module outline dimensional drawing that Fig. 2 is digital self-indicating scale of the present invention.
The circuit module pin arrangements figure that Fig. 3 is digital self-indicating scale of the present invention.
The electronic circuit schematic diagram of the circuit module that Fig. 4 is digital self-indicating scale of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, in empty frame be the circuit module principle of work block diagram with digital self-indicating scale of anti-cheating function of the present invention.
(A1) be the signal filtering amplifying circuit, enlargement factor is 128dB, external LOAD CELLS, and the voltage signal of input LOAD CELLS, the signal after amplification exports (A/D) D/A converting circuit to;
(A/D) be D/A converting circuit, simulating signal is converted into to digital signal, send (CPU1, CPU2) single-chip microcomputer to process and analyze;
(CPU1) be single chip circuit, external 5*5 keyboard, hummer and display, the keyboard input instruction such as receive unit price, zero clearing, allowance for bark, return, and export unit price, weight, unit, amount of money demonstration data by serial mode, send the verbal cue signal by hummer, realize traditional digital self-indicating scale function;
(CPU2) be single chip circuit, gather from the output weight signal of A/D D/A converting circuit and the weight display of CPU1 output, external wireless sending module (RF), function has: 1, to input, output signal collection and the comparison of weighing; 2, when being arranged, cheating records and preserves cheating information; 3, send cheating information by wireless sending module (RF); 4, receive the supervisory instruction that (RF) management system sends, and realize different management functions according to instruction;
(RF) be wireless transceiver circuit, frequency of operation is 2.4GHz, the cheating information data that wireless sending (CPU2) transmitted, and the supervisory instruction that the receiving management system sends, realize the wireless transmission of data and instruction;
The date circuit produces year, month, day, hour, min, second signal, meet CPU1, when cheating occurs when, the date temporal information is transferred to (CPU2) through (CPU1), (CPU1) adopt the serial mode communication and (CPU2), for recording the date and time that cheating occurs;
A2 is battery voltage detection circuit, is input as the LOAD CELLS operating voltage, and the voltage of output is connected to (A/D) D/A converting circuit.
As shown in Figure 2
,Circuit module outline dimensional drawing for digital self-indicating scale of the present invention.
As shown in Figure 3, be the circuit module pin arrangements figure of digital self-indicating scale of the present invention, pin function is as shown in table 1.
Table 1 has the pin function of the digital self-indicating scale circuit module of anti-cheating function
As shown in Figure 4, be the circuit module electronic circuit schematic diagram of digital self-indicating scale of the present invention, circuit connection and working method are as follows:
I/O1, I/O2 the 1st pin is the DC power anode incoming end, for circuit module provides DC supply, external direct current power supply+5V end, inside connect chip U3 (HX711) the 16th pin, triode VT (8050) emitter, integrated three-terminal regulator block IC (LM1117) the 1st pin (Vin input end) and single-chip microcomputer U2 (EM78P153) the 5th pin, the 2nd pin is unsettled, the 3rd pin is LOAD CELLS DC power supply cathode output end, output+2.5V DC voltage, LOAD CELLS and A/D change-over circuit share a power supply, external LOAD CELLS power positive end, inside connect triode VT (8050) collector and chip U3 (HX711) the 3rd pin (A/D change-over circuit power input), the 4th pin, the 5th pin are respectively the positive and negative signal input part of LOAD CELLS, the voltage range of input is 0 ~ 20mV, the external LOAD CELLS positive signal of the 4th pin output terminal, inside connect chip U3 (HX711) the 8th pin (A channel positive input terminal), the external LOAD CELLS negative signal of the 5th pin output terminal, inside connect chip U3 (HX711) the 7th pin (A channel negative input end), the 6th pin is unsettled, the 7th pin, the 8th pin are battery voltage detection signal positive-negative input end, input voltage range is 0 ~ 40mV, the 7th pin external connection battery voltage detection signal positive pole, inside connect chip U3 (HX711) the 10th pin (B passage positive input terminal), the 8th pin external connection battery voltage detection signal negative pole, inside connect chip U3 (HX711) the 9th pin (B passage negative input end), the clock signal output terminal of the 9th pin for showing that data serial is exported, clocking, external display driver circuit clock signal input terminal, inside connect single-chip microcomputer U1 (PIC16LF873) the 3rd pin, the data output end of the 10th pin for showing that data serial is exported, the demonstration data of the weight after output is processed, unit price, the amount of money, temporal information, external display driver circuit serial data input end, inside connect single-chip microcomputer U1 (PIC16LF873) the 4th pin, the 11st pin is audio signal output terminal, the output language cue, and external buzzer, inside connect single-chip microcomputer U1 (PIC16LF873) the 2nd pin, the 12nd pin, the 13rd pin is earth terminal, make the circuit potential reference point, the negative pole of external power supply, interior connecting resistance R2 lower end, capacitor C 1 negative pole, capacitor C 2 negative poles, capacitor C 3 negative poles, capacitor C 4 negative poles, single-chip microcomputer U1 (PIC16LF873) the 8th pin (VSS), single-chip microcomputer U1 (PIC16LF873) the 19th pin (VSS), single-chip microcomputer U2 (EM78P153) the 11st pin (VSS), chip U3 (HX711) the 5th pin (AGND), chip U3 (HX711) the 14th pin (XI), chip U3 (HX711) the 15th pin (RATE), clock chip U4 (DS1302) the 4th pin (GND), radio receiving transmitting module RF (JF24D) the 10th pin (GND), the 14th pin is+the 3.3V output end of stabilized voltage supply, is provide+3.3V of external circuit power supply, inside connects integrated three-terminal regulator block IC (LM1117) the 3rd pin (output terminal), 15th, 16,17,18,19,20,21,22,23,24 pin totally 10 pins, form 5*5 keyboard signal input end, 15th, 16,17,18,19 pin are the capable signal input part of keyboard, inside connect the 11st, 12,13,14,15 pin that single-chip microcomputer U1 (PIC16LF873) is corresponding, 20th, 21,22,23,24 pin are keyboard column signal input end, inside connect the 16th, 17,18,21,22 pin that single-chip microcomputer U1 (PIC16LF873) is corresponding,
Triode VT (8050) forms series type direct current regulation source with resistance R 1, resistance R 2, capacitor C 1, for external LOAD CELLS provides direct-current working volts; Resistance R 1, resistance R 2 are sample resistance, determine the size of output voltage; Capacitor C 1 is the Voltage-output filter capacitor; Triode VT (8050) is power adjustment pipe, emitter connects the 1st pin of I/O1, input pin for external power supply, base stage connects chip U3 (HX711) the 2nd pin, the 3rd pin of collector connecting resistance R1 upper end, capacitor C 1 positive pole, chip U3 (HX711) the 3rd pin, I/O1, for stabilized voltage supply output pin, output dc voltage+2.5V;
Integrated three-terminal regulator block IC (LM1117) and capacitor C 3, capacitor C 4 form an integrated DC stabilized voltage supply, are single-chip microcomputer U1 (PIC16LF873), clock chip U4 (DS1302) and provide+3.3V of radio receiving transmitting module RF (JF24D) circuit DC voltage; Integrated three-terminal regulator block IC (LM1117): the 1st pin (Vin) connects the 1st pin of I/O1; The 2nd pin (GND) is earth terminal, connects the 12nd pin of I/O1; The 3rd pin (Vout) is the regulator block output terminal, output+3.3V DC voltage, connect single-chip microcomputer U1 (PIC16LF873) the 1st pin (MCLR/VPP), single-chip microcomputer U1 (PIC16LF873) the 20th pin (VDD), clock chip U4 (DS1302) the 8th pin (VCC1), radio receiving transmitting module RF (JF24D) the 1st pin (VCC), I/O2 the 14th pin (+3.3V); Capacitor C 3, capacitor C 4 are power filtering capacitor, and capacitor C 3 positive poles connect integrated three-terminal regulator block IC (LM1117) the 1st pin, capacitor C 3 minus earths, and capacitor C 4 positive poles connect integrated three-terminal regulator block IC (LM1117) the 3rd pin, capacitor C 4 minus earths;
U3 (HX711) is a 24 A/D converter chips that design for LOAD CELLS, and inside comprises stabilized voltage supply, on-chip clock oscillator, two low-noise programmable amplifying circuits; The pga circuit A channel is as LOAD CELLS voltage input channel (A1), gain is set to 128dB, full scale differential input signal amplitude is ± 20mV, pga circuit B passage is as battery voltage detection input channel (A2), gain is 64dB, and full scale differential input signal amplitude is ± 40mV; Voltage digital signal and the single-chip microcomputer of pga circuit A channel, the output of B passage adopt serial communication, and communication speed is set to 10Hz; Integrated three-terminal regulator block IC (LM1117) function is exactly that voltage signal that LOAD CELLS is produced is amplified and to the detection of cell voltage, and carrying out the A/D conversion, single-chip microcomputer U1 (PIC16LF873) is exported in the voltage digital signal serial after conversion;
Chip U3 (HX711): the 1st pin (VSUP) is the digital power input end; The 16th pin (DVDD) is chip U3 (HX711) interior voltage-stabilized power supply input end, by I/O1 the 1st pin and external power are anodal, is connected; The 2nd pin (BASE) is chip U3 (HX711) interior voltage-stabilized power supply control output end, connects the base stage of triode VT (8050); The 3rd pin (AVDD) is the inner A/D analog power of chip U3 (HX711) input end, connects the collector of triode VT (8050), by I/O1 the 3rd pin, with LOAD CELLS, is connected, and makes A/D change-over circuit and LOAD CELLS use same power supply; The 4th pin (VFB) is chip U3 (HX711) interior voltage-stabilized power supply control input end, connecting resistance R1 lower end, resistance R 2 upper ends; The 5th pin (AGND) is the simulating signal earth terminal, ground connection; The 6th pin (VBG) is reference voltage output terminal, with capacitor C 2 positive poles, joins, and capacitor C 2 is power filtering capacitor, capacitor C 2 minus earths; The 7th pin (INA-), the 8th pin (INA+) be respectively the A channel differential signal-,+input end, connect the voltage signal of LOAD CELLS output by I/O1 the 4th pin and the 3rd pin; The 9th pin (INB-), the 10th pin (INB+) be respectively B channel difference sub-signal-,+input end, connect the voltage signal of battery voltage detection circuit output by I/O1 the 7th pin and the 6th pin; The 11st pin (PD_SCK), the 12nd pin (D_OUT) composition data serial output, the numerical data of weighing in chip U3 (HX711) is sent in single-chip microcomputer U1 (PIC16LF873), the 11st pin (PD_SCK) is clock line, connect single-chip microcomputer U1 (PIC16LF873) the 6th pin, the 12nd pin (D_OUT) is data line, the digital signal of weighing is exported in serial, connects single-chip microcomputer U1 (PIC16LF873) the 7th pin; The 13rd pin (XO), the 14th pin (XI) are the external crystal-controlled oscillation incoming end, adopt chip U3 (HX711) the internal clocking oscillatory circuit need not external crystal oscillator, and the 13rd pin is unsettled, the 14th pin (XI) ground connection; The 15th pin (RATE) is the output data rate control input end, and message transmission rate is 10Hz, ground connection;
Single-chip microcomputer U1 (PIC16LF873) is 8 CMOS flash memory single-chip microcomputers, the inner 48KHz oscillator with high precision 4MHz oscillator and low-power consumption, the I/O pin, 4K byte flash memory program storage, 192 byte SRAM, 128 byte EEROM, 1 serial communication end, 28 bit timings/counters, 1 the 16 bit timings/counter that have 22 independent, direction to control, operating voltage is 2.0 ~ 3.6V, with different sequence numbers, each device is programmed, make each device there is unique sequence number, EEROM has the power failure data hold function, makes the cheating information-storing device;
Single-chip microcomputer U1 (PIC16LF873): the 1st pin, the 20th pin connect direct supply+3.3V end, the 2nd pin is made output pin, and the output voice signal, by I/O1 the 11st pin external buzzer, the 3rd pin and the 4th pin are made output pin, and the serial ports output information of weighing shows data, and the 3rd pin output clock synchronizing signal, connect I/O1 the 9th pin, and the 4th pin serial output data signal connects I/O1 the 10th pin, by I/O1 the 9th pin, the 10th pin, external display driver circuit, the 5th pin is unsettled, the 6th pin and the 7th pin are made input pin, the digital signal of weighing of receiving chip U3 (HX711) output, the 6th pin is the digital signal serial input terminal of weighing, and connects chip U3 (HX711) the 12nd pin, the 7th pin is the serial synchronous input end of clock, connects chip U3 (HX711) the 11st pin, the 8th pin (VSS) and the 19th pin (VSS) ground connection, the 9th pin (OSC1) and the 10th pin (OSC2) are the external crystal-controlled oscillation incoming end, adopt internal oscillator (4MHz) not use external crystal-controlled oscillation, and the 9th pin (OSC1) and the 10th pin (OSC2) are unsettled, 11st, 12,13,14,15,16,17,18,21,22 pin are made input pin, with I/O2 the 15th, 16,17,18,19,20,21,22,23,24 pin, join respectively, 11st, 12,13,14,15 pin are keyboard column signal input end, 16th, 17,18,21,22 pin are the capable signal input part of keyboard, external 5*5 keyboard, receive keyboard input signal, 23rd, 25,26 pin connect respectively clock chip U4 (DS1302) the 7th, 6,5 pin, form bidirectional linked list communication between single-chip microcomputer U1 (PIC16LF873) and clock chip U4 (DS1302), the 23rd pin is the synchronizing clock signals output terminal, the 25th pin is the bidirectional data transfers end, the 26th pin is Enable Pin, when the 26th pin (RB5=1) is high level, date, time data that receive clock chip U4 (DS1302) produces, when the 26th pin (RB5=0) is low level, to the data of clock chip U4 (DS1302) tranmitting data register chip U4 (DS1302) initialization, date, time adjustment, the 24th pin is unsettled, the 27th, 28 pin connect respectively single-chip microcomputer U2 (EM78P153) the 14th pin and the 11st pin, form the both-way communication between single-chip microcomputer U1 (PIC16LF873) and single-chip microcomputer U2 (EM78P153), the 27th pin is the synchronizing clock signals line, the 28th pin is the bidirectional data transfers line, data between single-chip microcomputer U1 (PIC16LF873) and single-chip microcomputer U2 (EM78P153) are received, send out and controlled by single-chip microcomputer U2 (EM78P153), when the 27th pin (RB6=0) is electronegative potential, when the 28th pin (RB7=1) is noble potential, receive the supervisory instruction that single-chip microcomputer U2 (EM78P153) forwards, when the 27th pin (RB6=1) is noble potential, when the 28th pin (RB7=0) is electronegative potential, send the information of weighing of practising fraud,
The function that single-chip microcomputer U1 (PIC16LF873) realizes has:
(1) digital signal that receiving chip U3 (HX711) weighs, according to the information (unit price) of keyboard input, calculate the amount of money, is processed into and shows data output, produces the voice suggestion signal simultaneously;
(2) when cheating occurs, by single-chip microcomputer U2 (EM78P153), send instruction, record actual weight, show the cheating information such as weight, the amount of money, time;
(3) certainly imitate accurate function: before the use that comes into the market, by wireless instructions, realized weighing and the check and correction shown, this function will be closed after using first;
(4) to clock chip U4 (DS1302) initialization;
Single-chip microcomputer U2 (EM78P153) is a 8 single-chip microcomputers, operating voltage 2.5 ~ 5.5V, inner with high precision 4MHz oscillator, 14 I/O pins, 512*13 bit slice internal program storer, 32 byte SRAM, 18 bit timings/counter, 3 interrupt sources;
Single-chip microcomputer U2 (EM78P153): the 4th pin (VDD) connects I/O1 the 1st pin, with external power+5V end, is connected; The 11st pin (VSS) ground connection; The 12nd pin and the 13rd pin are made input pin, the input signal of weighing that serial received chip U3 (HX711) produces, the 12nd pin is the digital signal serial input terminal of weighing, connect chip U3 (HX711) the 12nd pin, the 13rd pin is the serial synchronous input end of clock, connects chip U3 (HX711) the 11st pin; The 2nd pin and the 3rd pin are made input pin, the weigh demonstration output signal of serial received after single-chip microcomputer U2 (EM78P153) processes, the 2nd pin shows the digital signal serial input terminal for weighing, connect single-chip microcomputer U1 (PIC16LF873) the 3rd pin, the 3rd pin is the serial synchronous input end of clock, connects single-chip microcomputer U1 (PIC16LF873) the 4th pin; The 1st pin, the 14th pin connect respectively single-chip microcomputer U1 (PIC16LF873) the 28th pin
,The 27th pin, form two-way data communication with single-chip microcomputer U1 (PIC16LF873), receives the cheating information that single-chip microcomputer U1 (PIC16LF873) sends, and to single-chip microcomputer U1 (PIC16LF873), sends supervisory instruction; 5th, 6,7,8,9,10 pins are controlled the sending and receiving of radio receiving transmitting module RF (JF24D) wireless data, and the 5th pin connects radio receiving transmitting module RF (JF24D) the 6th pin (CS); The 6th pin connects radio receiving transmitting module RF (JF24D) the 5th pin (MOSI); The 7th pin connects radio receiving transmitting module RF (JF24D) the 4th pin (SCK); The 8th pin connects radio receiving transmitting module RF (JF24D) the 3rd pin (CE); The 9th pin connects radio receiving transmitting module RF (JF24D) the 2nd pin (MISO); The 10th pin connects radio receiving transmitting module RF (JF24D) the 8th pin (IRQ);
The function that single-chip microcomputer U2 (EM78P153) realizes has:
(1) receive weigh input, output signal, analysis judges whether to have cheating, when cheating is arranged, send instruction through the 1st pin and the 14th pin to single-chip microcomputer U1 (PIC16LF873), and receive the cheating information such as weight that single-chip microcomputer U1 (PIC16LF873) beams back, unit price, the amount of money, time, preserve and pass through radio receiving transmitting module RF (JF24D) by the cheating information such as weight, unit price, the amount of money, time and send to digital self-indicating scale management platform for No. ID;
(2) the monitoring cell voltage changes, and when the cell voltage variation abnormality, by radio receiving transmitting module RF (JF24D), the cell voltage change information is wirelessly transmitted to digital self-indicating scale management platform;
(3) wireless receiving and dispatching data management, keep being connected by Wireless Data Transmission mode and management platform, realizes real-time, system management to digital self-indicating scale;
Clock chip U4 (DS1302) is a kind of high-performance of releasing of U.S. DALLAS company, low-power consumption, with the real-time timepiece chip of RAM, operating voltage is 2.5V～5.5V, adopt three-wire interface and CPU to carry out synchronous communication, it can to year, month, day, week, the time, minute, second carries out timing, has the leap year compensate function.Clock chip U4 (DS1302) and crystal oscillator Y1, resistance R 3 form date, time circuit in the present invention, produce date, time signal;
Clock chip U4 (DS1302): the 8th pin (VCC1) is the primary power input end, connects I/O2 the 14th pin (+3.3V); The 1st pin (VCC2) is the standby power supply input end, by resistance R 3, connects I/O2 the 14th pin (+3.3V); The 2nd pin and the 3rd pin are the crystal oscillator incoming end, meet crystal oscillator Y1, and crystal oscillator frequency is 32.768KHz; The 4th pin (VSS) ground connection; The 5th pin (CE) is the function end, controls the data transmission of clock chip U4 (DS1302), and the transmission of data is controlled by single-chip microcomputer U1 (PIC16LF873), connects the 26th pin of single-chip microcomputer U1 (PIC16LF873); The 6th pin is (I/O) data transmission terminal, realizes and single-chip microcomputer U1 (PIC16LF873) bidirectional data transfers, connects the 25th pin of single-chip microcomputer U1 (PIC16LF873); The 7th pin (SCLK) is the synchronizing clock signals input end, connects the 23rd pin of single-chip microcomputer U1 (PIC16LF873);
Clock chip U4 (DS1302) function produce exactly year, month, day, week, the time, the minute, second time signal, when cheating occurs when, under single-chip microcomputer U1 (PIC16LF873) controls, clock chip U4 (DS1302) sends to single-chip microcomputer U1 (PIC16LF873) by the time signal of generation;
RF (JF24D) is the wireless data transceiving two-way modules, and frequency of operation is 2.4GHz, is operated in the open ISM band in the whole world, exempt from licence and use, radio receiving transmitting module RF (JF24D) has 81 passages, can arrange arbitrarily and does not interfere with each other, transfer rate is 1MHz
Receiving sensitivity is-85dB, and maximum transmission distance is 100m, and DLL (dynamic link library) is the SPI digital interface;
Radio receiving transmitting module RF (JF24D): the 1st pin (VCC) connects I/O2 the 14th pin (+3.3V); The 2nd pin (MISO) is for receiving data output end, and the supervisory instruction that digital self-indicating scale management platform is sent receives and be transferred to single-chip microcomputer U2 (EM78P153), connects single-chip microcomputer U2 (EM78P153) the 9th pin; The 3rd pin (CE) is the function end, controls radio receiving transmitting module RF (JF24D) sending and receiving, and the sending and receiving state is controlled by single-chip microcomputer U2 (EM78P153), connects single-chip microcomputer U2 (EM78P153) the 8th pin; The 4th pin (SCK) is clock signal input terminal, connects single-chip microcomputer U2 (EM78P153) the 7th pin; The 5th pin (MOSI) is for sending data input pin, and cheating information, battery ANOMALOUS VARIATIONS information that the data of input are single-chip microcomputer U2 (EM78P153) record and preservation, connect single-chip microcomputer U2 (EM78P153) the 6th pin; The 6th pin (CS) is the bus Enable Pin, controlled by single-chip microcomputer U2 (EM78P153), connects single-chip microcomputer U2 (EM78P153) the 5th pin; The 7th pin (NC) is unsettled; The 8th pin (IRQ) is the sending and receiving state flag bit, and when the sending and receiving signal is arranged, single-chip microcomputer U2 (EM78P153) produces interruption, enters wireless data sending and receiving program, connects single-chip microcomputer U2 (EM78P153) the 10th pin; The 9th pin (NC) is unsettled; The 10th pin (GND) ground connection;
The major function of radio receiving transmitting module RF (JF24D) is exactly the sending and receiving of instruction and data, realize being connected between digital self-indicating scale and digital self-indicating scale management platform by wireless mode, realize that management platform carries out real-time monitoring and management to digital self-indicating scale.
The circuit module assembling process is as follows:
1, press Fig. 4 principle diagram design pcb board, pcb board is of a size of 40mm*30mm*1.2mm;
2, press specification and the parameter buying components and parts of the components and parts of Fig. 4 schematic diagram;
3, coding, programming single-chip microcomputer PLC16LF873, single-chip microcomputer EM78P153;
4, components and parts are welded to pcb board;
5, use the epoxy encapsulation circuit, make digital self-indicating scale circuit module of the present invention, as shown in Figure 2, pin arrangements as shown in Figure 3 for physical dimension.
Claims (9)
1. the digital self-indicating scale that there is anti-cheating function, it is characterized in that: will there is voltage amplification, battery voltage detection, the A/D conversion, the keyboard signal input, the amount of money calculates, show data output, the voice suggestion signal produces, cheating data analysis judgement, the cheating information recording, accurate from effect, wireless data transceiving, the management of wireless data transceiving, the circuit that time on date produces function is welded on a pcb board, make a circuit module, the external LOAD CELLS of this circuit module, the 5*5 keyboard, display, hummer, 5.5V ~ 9.6V direct supply, form the digital self-indicating scale with anti-cheating function, the circuit of the circuit module of numeral self-indicating scale connects as follows:
(1) voltage signal of external LOAD CELLS inputs to signal filtering amplifying circuit (A1), and the signal after amplification exports D/A converting circuit (A/D) to;
(2) simulating signal of input is converted into digital signal through D/A converting circuit (A/D), send (CPU1, CPU2) single-chip microcomputer to process and analyze;
(3) single chip circuit (CPU1) receives unit price, zero clearing, allowances for bark, returns keyboard input instruction, and exports unit price, weight, unit, amount of money demonstration data by serial mode;
(4) single chip circuit (CPU2) gathers the output weight signal of D/A converting circuit (A/D) and the weight display of CPU1 output;
(5) wireless transceiver circuit (RF) sends the cheating information data be kept in (CPU2), the supervisory instruction that the receiving management system sends, and deposit in (CPU2);
(6) the date circuit produces year, month, day, hour, min, second signal, exports (CPU1) to;
(7) power supply 1 is primary power, is input as 5.5 ~ 9.6V DC voltage, be output as+3.3V DC voltage;
(8) power supply 2 is the LOAD CELLS power source special, external LOAD CELLS power end;
(9) operating voltage of LOAD CELLS inputs to battery voltage detection circuit A2, and the output voltage of A2 is connected to D/A converting circuit (A/D).
2. the digital self-indicating scale with anti-cheating function according to claim 1, it is characterized in that: the circuit module of above-mentioned digital self-indicating scale adopts the dip form, amount to 24 pins, pin 1 ~ 12 is I/O1, pin 13 ~ 24 is I/O2, I/O1, I/O2 the 1st pin is the DC power anode incoming end, for circuit module provides DC supply, external direct current power supply+5V end, inside connect chip U3 (HX711) the 16th pin, triode VT (8050) emitter, integrated three-terminal regulator block IC (LM1117) the 1st pin (Vin input end) and single-chip microcomputer U2 (EM78P153) the 5th pin, the 2nd pin is unsettled, the 3rd pin is LOAD CELLS DC power supply cathode output end, output+2.5V DC voltage, LOAD CELLS and A/D change-over circuit share a power supply, external LOAD CELLS power positive end, inside connect triode VT (8050) collector and chip U3 (HX711) the 3rd pin (A/D change-over circuit power input), the 4th pin, the 5th pin are respectively the positive and negative signal input part of LOAD CELLS, the voltage range of input is 0 ~ 20mV, the external LOAD CELLS positive signal of the 4th pin output terminal, inside connect chip U3 (HX711) the 8th pin (A channel positive input terminal), the external LOAD CELLS negative signal of the 5th pin output terminal, inside connect chip U3 (HX711) the 7th pin (A channel negative input end), the 6th pin is unsettled, the 7th pin, the 8th pin are battery voltage detection signal positive-negative input end, input voltage range is 0 ~ 40mV, the 7th pin external connection battery voltage detection signal positive pole, inside connect chip U3 (HX711) the 10th pin (B passage positive input terminal), the 8th pin external connection battery voltage detection signal negative pole, inside connect chip U3 (HX711) the 9th pin (B passage negative input end), the clock signal output terminal of the 9th pin for showing that data serial is exported, clocking, external display driver circuit clock signal input terminal, inside connect single-chip microcomputer U1 (PIC16LF873) the 3rd pin, the data output end of the 10th pin for showing that data serial is exported, the demonstration data of the weight after output is processed, unit price, the amount of money, temporal information, external display driver circuit serial data input end, inside connect single-chip microcomputer U1 (PIC16LF873) the 4th pin, the 11st pin is audio signal output terminal, the output language cue, and external buzzer, inside connect single-chip microcomputer U1 (PIC16LF873) the 2nd pin, the 12nd pin, the 13rd pin is earth terminal, make the circuit potential reference point, the negative pole of external power supply, interior connecting resistance R2 lower end, capacitor C 1 negative pole, capacitor C 2 negative poles, capacitor C 3 negative poles, capacitor C 4 negative poles, single-chip microcomputer U1 (PIC16LF873) the 8th pin (VSS), single-chip microcomputer U1 (PIC16LF873) the 19th pin (VSS), single-chip microcomputer U2 (EM78P153) the 11st pin (VSS), chip U3 (HX711) the 5th pin (AGND), chip U3 (HX711) the 14th pin (XI), chip U3 (HX711) the 15th pin (RATE), clock chip U4 (DS1302) the 4th pin (GND), radio receiving transmitting module RF (JF24D) the 10th pin (GND), the 14th pin is+the 3.3V output end of stabilized voltage supply, is provide+3.3V of external circuit power supply, inside connects integrated three-terminal regulator block IC (LM1117) the 3rd pin (output terminal), 15th, 16,17,18,19,20,21,22,23,24 pin totally 10 pins, form 5*5 keyboard signal input end, 15th, 16,17,18,19 pin are the capable signal input part of keyboard, inside connect the 11st, 12,13,14,15 pin that single-chip microcomputer U1 (PIC16LF873) is corresponding, 20th, 21,22,23,24 pin are keyboard column signal input end, inside connect the 16th, 17,18,21,22 pin that single-chip microcomputer U1 (PIC16LF873) is corresponding.
3. the digital self-indicating scale with anti-cheating function according to claim 2 is characterized in that: triode VT (8050) forms series type direct current regulation source with resistance R 1, resistance R 2, capacitor C 1, for external LOAD CELLS provides direct-current working volts; Resistance R 1, resistance R 2 are sample resistance, determine the size of output voltage; Capacitor C 1 is the Voltage-output filter capacitor; Triode VT (8050) is power adjustment pipe, emitter connects the 1st pin of I/O1, input pin for external power supply, base stage connects chip U3 (HX711) the 2nd pin, the 3rd pin of collector connecting resistance R1 upper end, capacitor C 1 positive pole, chip U3 (HX711) the 3rd pin, I/O1, for stabilized voltage supply output pin, output dc voltage+2.5V.
4. the digital self-indicating scale with anti-cheating function according to claim 2, it is characterized in that: integrated three-terminal regulator block IC (LM1117) and capacitor C 3, capacitor C 4 form an integrated DC stabilized voltage supply, for single-chip microcomputer U1 (PIC16LF873), clock chip U4 (DS1302) and provide+3.3V of radio receiving transmitting module RF (JF24D) circuit DC voltage, integrated three-terminal regulator block IC (LM1117): the 1st pin (Vin) connects the 1st pin of I/O1; The 2nd pin (GND) is earth terminal, connects the 12nd pin of I/O1; The 3rd pin (Vout) is the regulator block output terminal, output+3.3V DC voltage, connect single-chip microcomputer U1 (PIC16LF873) the 1st pin (MCLR/VPP), single-chip microcomputer U1 (PIC16LF873) the 20th pin (VDD), clock chip U4 (DS1302) the 8th pin (VCC1), radio receiving transmitting module RF (JF24D) the 1st pin (VCC), I/O2 the 14th pin (+3.3V); Capacitor C 3, capacitor C 4 are power filtering capacitor, and capacitor C 3 positive poles connect integrated three-terminal regulator block IC (LM1117) the 1st pin, capacitor C 3 minus earths, and capacitor C 4 positive poles connect integrated three-terminal regulator block IC (LM1117) the 3rd pin, capacitor C 4 minus earths.
5. the digital self-indicating scale with anti-cheating function according to claim 2, it is characterized in that: chip U3 (HX711): the 1st pin (VSUP) is the digital power input end; The 16th pin (DVDD) is chip U3 (HX711) interior voltage-stabilized power supply input end, by I/O1 the 1st pin and external power are anodal, is connected; The 2nd pin (BASE) is chip U3 (HX711) interior voltage-stabilized power supply control output end, connects the base stage of triode VT (8050); The 3rd pin (AVDD) is the inner A/D analog power of chip U3 (HX711) input end, connects the collector of triode VT (8050), by I/O1 the 3rd pin, with LOAD CELLS, is connected, and makes A/D change-over circuit and LOAD CELLS use same power supply; The 4th pin (VFB) is chip U3 (HX711) interior voltage-stabilized power supply control input end, connecting resistance R1 lower end, resistance R 2 upper ends; The 5th pin (AGND) is the simulating signal earth terminal, ground connection; The 6th pin (VBG) is reference voltage output terminal, with capacitor C 2 positive poles, joins, and capacitor C 2 is power filtering capacitor, capacitor C 2 minus earths; The 7th pin (INA-), the 8th pin (INA+) be respectively the A channel differential signal-,+input end, connect the voltage signal of LOAD CELLS output by I/O1 the 4th pin and the 3rd pin; The 9th pin (INB-), the 10th pin (INB+) be respectively B channel difference sub-signal-,+input end, connect the voltage signal of battery voltage detection circuit output by I/O1 the 7th pin and the 6th pin; The 11st pin (PD_SCK), the 12nd pin (D_OUT) composition data serial output, the numerical data of weighing in chip U3 (HX711) is sent in single-chip microcomputer U1 (PIC16LF873), the 11st pin (PD_SCK) is clock line, connect single-chip microcomputer U1 (PIC16LF873) the 6th pin, the 12nd pin (D_OUT) is data line, the digital signal of weighing is exported in serial, connects single-chip microcomputer U1 (PIC16LF873) the 7th pin; The 13rd pin (XO), the 14th pin (XI) are the external crystal-controlled oscillation incoming end, and chip U3 (HX711) internal clocking oscillatory circuit need not external crystal oscillator, and the 13rd pin is unsettled, the 14th pin (XI) ground connection; The 15th pin (RATE) is the output data rate control input end, and message transmission rate is 10Hz, ground connection.
6. the digital self-indicating scale with anti-cheating function according to claim 2 is characterized in that: single-chip microcomputer U1 (PIC16LF873): the 1st pin, the 20th pin connect direct supply+3.3V end, the 2nd pin is made output pin, and the output voice signal, by I/O1 the 11st pin external buzzer, the 3rd pin and the 4th pin are made output pin, and the serial ports output information of weighing shows data, and the 3rd pin output clock synchronizing signal, connect I/O1 the 9th pin, and the 4th pin serial output data signal connects I/O1 the 10th pin, by I/O1 the 9th pin, the 10th pin, external display driver circuit, the 5th pin is unsettled, the 6th pin and the 7th pin are made input pin, the digital signal of weighing of receiving chip U3 (HX711) output, the 6th pin is the digital signal serial input terminal of weighing, and connects chip U3 (HX711) the 12nd pin, the 7th pin is the serial synchronous input end of clock, connects chip U3 (HX711) the 11st pin, the 8th pin (VSS) and the 19th pin (VSS) ground connection, the 9th pin (OSC1) and the 10th pin (OSC2) they are the external crystal-controlled oscillation incoming end, internal oscillator (4MHz), and the 9th pin (OSC1) and the 10th pin (OSC2) are unsettled, 11st, 12,13,14,15,16,17,18,21,22 pin are made input pin, with I/O2 the 15th, 16,17,18,19,20,21,22,23,24 pin, join respectively, 11st, 12,13,14,15 pin are keyboard column signal input end, 16th, 17,18,21,22 pin are the capable signal input part of keyboard, external 5*5 keyboard, receive keyboard input signal, 23rd, 25,26 pin connect respectively clock chip U4 (DS1302) the 7th, 6,5 pin, form bidirectional linked list communication between single-chip microcomputer U1 (PIC16LF873) and clock chip U4 (DS1302), the 23rd pin is the synchronizing clock signals output terminal, the 25th pin is the bidirectional data transfers end, the 26th pin is Enable Pin, when the 26th pin (RB5=1) is high level, date, time data that receive clock chip U4 (DS1302) produces, when the 26th pin (RB5=0) is low level, to the data of clock chip U4 (DS1302) tranmitting data register chip U4 (DS1302) initialization, date, time adjustment, the 24th pin is unsettled, the 27th, 28 pin connect respectively single-chip microcomputer U2 (EM78P153) the 14th pin and the 11st pin, form the both-way communication between single-chip microcomputer U1 (PIC16LF873) and single-chip microcomputer U2 (EM78P153), the 27th pin is the synchronizing clock signals line, the 28th pin is the bidirectional data transfers line, data between single-chip microcomputer U1 (PIC16LF873) and single-chip microcomputer U2 (EM78P153) are received, send out and controlled by single-chip microcomputer U2 (EM78P153), when the 27th pin (RB6=0) is electronegative potential, when the 28th pin (RB7=1) is noble potential, receive the supervisory instruction that single-chip microcomputer U2 (EM78P153) forwards, when the 27th pin (RB6=1) is noble potential, when the 28th pin (RB7=0) is electronegative potential, send the information of weighing of practising fraud.
7. the digital self-indicating scale with anti-cheating function according to claim 2, it is characterized in that: single-chip microcomputer U2 (EM78P153): the 4th pin (VDD) connects I/O1 the 1st pin, with external power+5V end, is connected; The 11st pin (VSS) ground connection; The 12nd pin and the 13rd pin are made input pin, the input signal of weighing that serial received chip U3 (HX711) produces, the 12nd pin is the digital signal serial input terminal of weighing, connect chip U3 (HX711) the 12nd pin, the 13rd pin is the serial synchronous input end of clock, connects chip U3 (HX711) the 11st pin; The 2nd pin and the 3rd pin are made input pin, the weigh demonstration output signal of serial received after single-chip microcomputer U2 (EM78P153) processes, the 2nd pin shows the digital signal serial input terminal for weighing, connect single-chip microcomputer U1 (PIC16LF873) the 3rd pin, the 3rd pin is the serial synchronous input end of clock, connects single-chip microcomputer U1 (PIC16LF873) the 4th pin; The 1st pin, the 14th pin connect respectively single-chip microcomputer U1 (PIC16LF873) the 28th pin
,The 27th pin, form two-way data communication with single-chip microcomputer U1 (PIC16LF873), receives the cheating information that single-chip microcomputer U1 (PIC16LF873) sends, and to single-chip microcomputer U1 (PIC16LF873), sends supervisory instruction; 5th, 6,7,8,9,10 pins are controlled the sending and receiving of radio receiving transmitting module RF (JF24D) wireless data, and the 5th pin connects radio receiving transmitting module RF (JF24D) the 6th pin (CS); The 6th pin connects radio receiving transmitting module RF (JF24D) the 5th pin (MOSI); The 7th pin connects radio receiving transmitting module RF (JF24D) the 4th pin (SCK); The 8th pin connects radio receiving transmitting module RF (JF24D) the 3rd pin (CE); The 9th pin connects radio receiving transmitting module RF (JF24D) the 2nd pin (MISO); The 10th pin connects radio receiving transmitting module RF (JF24D) the 8th pin (IRQ).
8. the digital self-indicating scale with anti-cheating function according to claim 2, it is characterized in that: clock chip U4 (DS1302): the 8th pin (VCC1) is the primary power input end, connects I/O2 the 14th pin (+3.3V); The 1st pin (VCC2) is the standby power supply input end, by resistance R 3, connects I/O2 the 14th pin (+3.3V); The 2nd pin and the 3rd pin are the crystal oscillator incoming end, meet crystal oscillator Y1, and crystal oscillator frequency is 32.768KHz; The 4th pin (VSS) ground connection; The 5th pin (CE) is the function end, controls the data transmission of clock chip U4 (DS1302), and the transmission of data is controlled by single-chip microcomputer U1 (PIC16LF873), connects the 26th pin of single-chip microcomputer U1 (PIC16LF873); The 6th pin is (I/O) data transmission terminal, realizes and single-chip microcomputer U1 (PIC16LF873) bidirectional data transfers, connects the 25th pin of single-chip microcomputer U1 (PIC16LF873); The 7th pin (SCLK) is the synchronizing clock signals input end, connects the 23rd pin of single-chip microcomputer U1 (PIC16LF873).
9. the digital self-indicating scale with anti-cheating function according to claim 2, it is characterized in that: radio receiving transmitting module RF (JF24D): the 1st pin (VCC) connects I/O2 the 14th pin (+3.3V); The 2nd pin (MISO) is for receiving data output end, and the supervisory instruction that digital self-indicating scale management platform is sent receives and be transferred to single-chip microcomputer U2 (EM78P153), connects single-chip microcomputer U2 (EM78P153) the 9th pin; The 3rd pin (CE) is the function end, controls radio receiving transmitting module RF (JF24D) sending and receiving, and the sending and receiving state is controlled by single-chip microcomputer U2 (EM78P153), connects single-chip microcomputer U2 (EM78P153) the 8th pin; The 4th pin (SCK) is clock signal input terminal, connects single-chip microcomputer U2 (EM78P153) the 7th pin; The 5th pin (MOSI) is for sending data input pin, and cheating information, battery ANOMALOUS VARIATIONS information that the data of input are single-chip microcomputer U2 (EM78P153) record and preservation, connect single-chip microcomputer U2 (EM78P153) the 6th pin; The 6th pin (CS) is the bus Enable Pin, controlled by single-chip microcomputer U2 (EM78P153), connects single-chip microcomputer U2 (EM78P153) the 5th pin; The 7th pin (NC) is unsettled; The 8th pin (IRQ) is the sending and receiving state flag bit, and when the sending and receiving signal is arranged, single-chip microcomputer U2 (EM78P153) produces interruption, enters wireless data sending and receiving program, connects single-chip microcomputer U2 (EM78P153) the 10th pin; The 9th pin (NC) is unsettled; The 10th pin (GND) ground connection.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104121978A (en) * | 2014-07-25 | 2014-10-29 | 中山佳维电子有限公司 | Tamper-resistant electronic price scale |
| CN105527009A (en) * | 2014-09-29 | 2016-04-27 | 徐工集团工程机械股份有限公司 | Weighing system and weighing method having self-calibration function |
| CN105588634A (en) * | 2015-11-30 | 2016-05-18 | 蚌埠大洋传感系统工程有限公司 | Power-saving wireless transmitter for weighing sensor |
| CN103995779B (en) * | 2014-05-29 | 2016-11-30 | 广州市中兴电子衡器厂 | A kind of anti-cheating method of electronic scale |
| CN107063408A (en) * | 2016-11-12 | 2017-08-18 | 淮阴工学院 | A kind of multifunctional digital electronic scale |
| CN109724680A (en) * | 2019-01-18 | 2019-05-07 | 深圳市计量质量检测研究院（国家高新技术计量站、国家数字电子产品质量监督检验中心） | Weighing anti-cheating method in market |
| CN110301793A (en) * | 2019-07-23 | 2019-10-08 | 奉志强 | A kind of health is drunk the intelligent wineglass and its implementation of management |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916495A (en) * | 2019-01-18 | 2019-06-21 | 深圳市计量质量检测研究院（国家高新技术计量站、国家数字电子产品质量监督检验中心） | Electronic scale monitoring method and system |
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| CN103424170B (en) | 2015-11-25 |
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