CN109613862B - Commodity monitoring system - Google Patents
Commodity monitoring system Download PDFInfo
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- CN109613862B CN109613862B CN201811495657.4A CN201811495657A CN109613862B CN 109613862 B CN109613862 B CN 109613862B CN 201811495657 A CN201811495657 A CN 201811495657A CN 109613862 B CN109613862 B CN 109613862B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
Abstract
The invention discloses a commodity monitoring system, which is applied to a goods shelf and comprises: the device comprises a power supply module, a sensor module, a signal processing module, a control module and an external communication module; the sensor module is connected with the signal processing module, the signal processing module is connected with the control module, the control module is connected with the external communication module, and the power supply module is respectively connected with the sensor module, the signal processing module, the control module and the external communication module; the sensor module obtains pressure borne by the goods shelf and processes the pressure to output a voltage signal, the signal processing module converts the voltage signal into a frequency signal, the control module analyzes the frequency signal to obtain pressure variation and calculates the quantity variation of the goods on the goods shelf according to the pressure variation, and the external communication module transmits the quantity variation to external communication equipment. The invention can find the goods needing to be supplemented in time and realize the automatic monitoring of the goods in the supermarket.
Description
Technical Field
The invention relates to the technical field of automation, in particular to a commodity monitoring system.
Background
The supermarket is an operation state with the main characteristics of automatic goods taking and self service, and receives wide popularity of customers in a brand new mode of open sale and customer self-selection.
With the great popularization of automation technology and the rapid development of unmanned supermarkets, the operation mode types of most of the current unmanned supermarkets are mainly automatic selling and intelligent payment, the commodity selling condition and the automatic replenishment technology of the unmanned supermarkets are not mature, the commodity monitoring of the traditional supermarkets is mainly manually checked, the method is low in efficiency, the selling condition of the commodities cannot be monitored in time, the commodities needing replenishment cannot be found in time, and the overall economic benefit of the supermarkets is seriously influenced.
Disclosure of Invention
The embodiment of the invention provides a commodity monitoring system, and aims to solve the problem that the commodity condition on a supermarket commodity monitoring system cannot be automatically monitored in the prior art.
The embodiment of the invention provides a commodity monitoring system, which is applied to a goods shelf and comprises the following components: the device comprises a power supply module, a sensor module, a signal processing module, a control module and an external communication module;
the sensor module is connected with the signal processing module, the signal processing module is connected with the control module, the control module is connected with the external communication module, and the power supply module is respectively connected with the sensor module, the signal processing module, the control module and the external communication module;
the sensor module is installed on a goods shelf, the sensor module acquires pressure borne by the goods shelf and processes the pressure to output a voltage signal, the signal processing module converts the voltage signal into a frequency signal, the control module analyzes the frequency signal to obtain a pressure variation and calculates the quantity variation of goods on the goods shelf according to the pressure variation, and the external communication module transmits the quantity variation to external communication equipment.
In one embodiment, the sensor module comprises a measurement unit and an adjustment unit;
the first input end of the measuring unit is the first input end of the sensor module, the second input end of the measuring unit is the second input end of the sensor module, the first output end of the measuring unit is the first output end of the sensor module, the second output end of the measuring unit is the second output end of the sensor module, the input end of the adjusting unit is connected with the second input end of the measuring unit, the first end of the adjusting unit is connected with the first output end of the measuring unit, and the second end of the adjusting unit is connected with the second output end of the measuring unit;
the measuring unit outputs a voltage signal, and the adjusting unit is adjusted to adjust the output voltage range of the measuring unit.
In one embodiment, the measurement unit comprises a first resistive strain gauge, a second resistive strain gauge, a third resistive strain gauge and a fourth resistive strain gauge;
the second end of the first resistance strain gauge and the first end of the second resistance strain gauge are connected together to form a first output end of the measuring unit, the second end of the second resistance strain gauge and the first end of the third resistance strain gauge are connected together to form a second input end of the measuring unit, the second end of the third resistance strain gauge and the first end of the fourth resistance strain gauge are connected together to form a second output end of the measuring unit, and the first end of the first resistance strain gauge and the second end of the fourth resistance strain gauge are connected together to form a first input end of the measuring unit.
In one embodiment, the adjustment unit includes a sliding resistor R1 and a resistor R2;
the first end of the sliding resistor R1 is the first end of the adjusting unit, the second end of the sliding resistor R1 is the second end of the adjusting unit, the first end of the resistor R2 is the input end of the adjusting unit, and the second end of the resistor R2 is connected with the sliding end of the sliding resistor R1.
In one embodiment, the control module comprises a microcontroller, a crystal oscillator, a resistor R3, a capacitor C1, a capacitor C2, a capacitor C3, and a switch;
the XTA L0 pin of the microcontroller is connected to the first end of the capacitor C1 and the first end of the crystal oscillator, respectively, the second end of the capacitor C1 and the first end of the capacitor C2 are connected to ground, the XTA L1 pin of the microcontroller is connected to the second end of the capacitor C2 and the second end of the crystal oscillator, respectively, the RESET pin of the microcontroller is connected to the first end of the capacitor C3, the first end of the switch, and the first end of the resistor R3, the second end of the capacitor C3 and the second end of the switch are connected to a voltage source, the second end of the resistor R3 is connected to ground, and the P3.5 pin of the microcontroller is an input terminal of the control module.
In one embodiment, the power module includes a sensor power unit; the sensor power supply unit comprises a reference power supply, a first voltage-stabilizing subunit, a second voltage-stabilizing subunit and a filtering subunit;
the first input end of the first voltage-stabilizing subunit and the first input end of the second voltage-stabilizing subunit are connected with the output end of the reference power supply in a common way, the input end of the reference power supply, the second input end of the first voltage-stabilizing subunit and the second input end of the second voltage-stabilizing subunit are connected with a positive power supply in a common way, the third input end of the first voltage-stabilizing subunit and the third input end of the second voltage-stabilizing subunit are connected with a negative power supply in a common way, the output end of the first voltage-stabilizing subunit and the first input end of the filtering subunit are connected together to form a first output end of the sensor power supply unit, the output end of the second voltage-stabilizing subunit and the output end of the filtering subunit are connected together to form a second output end of the sensor power supply unit, and a second input end of the filtering subunit is connected with a signal end of the second voltage-stabilizing subunit.
In one embodiment, the first voltage-stabilizing subunit includes a first amplifier, a first transistor, a resistor R4, a resistor R5, a resistor R6, a resistor R7, and a resistor R20;
a first end of the resistor R4 is a first input end of the first voltage-stabilizing subunit, a second end of the resistor R4 is connected to a first input end of the first amplifier, a second input end of the first amplifier is connected to a first end of the resistor R5 and a first end of the resistor R20, a second end of the resistor R5 is grounded, a positive power terminal of the first amplifier and a collector of the first transistor are connected in common to form a second input end of the first voltage-stabilizing subunit, a negative power terminal of the first amplifier is a third input end of the first voltage-stabilizing subunit, an output end of the first amplifier is connected to a first end of the resistor R7, a second end of the resistor R7 is connected to a base of the first transistor, an emitter of the first transistor and a second end of the resistor R20 are connected in common to form an output end of the first voltage-stabilizing subunit, a controlled end of the resistor R6 is connected to a positive power terminal of the first amplifier, a first end of the resistor R6 is connected to the first connection terminal of the first amplifier, and a second end of the resistor R6 is connected to the second connection terminal of the first amplifier.
In one embodiment, the signal processing module includes a signal amplifying unit and a signal converting unit;
the first input end of the signal amplification unit is the first input end of the signal processing module, the second input end of the signal amplification unit is the second input end of the signal processing module, the output end of the signal amplification unit is connected with the input end of the signal conversion unit, and the output end of the signal conversion unit is the output end of the signal processing module;
the signal amplification unit amplifies the voltage signal, and the signal conversion unit converts the amplified voltage signal into a frequency signal.
In one embodiment, the signal amplifying unit includes a first signal amplifier, a second signal amplifier, a third signal amplifier, a fourth signal amplifier, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a capacitor C4, a capacitor C5, and a capacitor C6;
the first input end of the first signal amplifier is the first input end of the signal amplifying unit, the first input end of the second signal amplifier is the second input end of the signal amplifying unit, the second input end of the first signal amplifier is respectively connected with the second end of the resistor R9, the sliding end of the resistor R10 and the first end of the resistor R10, the output end of the first signal amplifier is respectively connected with the first end of the resistor R8 and the first end of the resistor R9, the second end of the resistor R10 is respectively connected with the first end of the resistor R11 and the second input end of the second signal amplifier, the output end of the second signal amplifier is respectively connected with the second end of the resistor R11 and the first end of the resistor R12, and the second end of the resistor R12 is respectively connected with the first end of the resistor R13 and the second input end of the third signal amplifier, the second end of the resistor R13 is grounded, the second end of the resistor R8 is respectively connected with the first input end of the third signal amplifier and the first end of the resistor R14, the output end of the third signal amplifier is respectively connected with the second end of the resistor R14 and the first end of the resistor R15, a second end of the resistor R15 is respectively connected with a first end of the resistor R16 and a first end of the capacitor C4, the second end of the capacitor C4 is grounded, the second end of the resistor R16 is respectively connected with the first end of the resistor R17 and the first end of the capacitor C5, a second terminal of the resistor R17 is connected to a first terminal of the capacitor C6 and a first input terminal of the fourth signal amplifier, the second terminal of the capacitor C6 is grounded, and the output terminal of the fourth signal amplifier, the second terminal of the capacitor C5, and the second input terminal of the fourth signal amplifier are commonly connected to the output terminal of the signal amplifying unit.
In one embodiment, the signal conversion unit includes a V/F converter, a flip-flop, an inverter, a resistor R18, a resistor R19;
the first end of the resistor R18 and the controlled end of the resistor R18 are connected in common to form the input end of the signal conversion unit, the second end of the resistor R18 is connected with the 2 pin of the V/F converter, the 4 pin of the V/F converter and the first end of the resistor R19 are connected in common to a positive power supply, the 6 pin of the V/F converter and the second end of the resistor R19 are connected in common to a negative power supply, the 8 pin of the V/F converter is connected with the sliding end of the resistor R19, the 7 pin of the V/F converter is connected with the input end of the trigger, the output end of the trigger is connected with the input end of the inverter, and the output end of the inverter is the output end of the signal conversion unit.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: according to the invention, the weight of the commodities on the supermarket goods sorting rack is acquired by the sensor module, the voltage change of the sensor module is caused by the weight change, and the control module can monitor the variation of the pressure borne by the supermarket goods sorting rack in real time by analyzing the voltage change and comparing the variation with the preset voltage, so that the change of the corresponding commodities on the supermarket goods sorting rack is obtained.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a block diagram of a merchandise monitoring system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a cantilever beam according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a circuit configuration of the sensor module of FIG. 1 according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a circuit structure of the control module shown in FIG. 1 according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a sensor power supply unit according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of the signal processing module in fig. 1 according to an embodiment of the present invention;
fig. 7 is a schematic circuit diagram of the external communication module in fig. 1 according to an embodiment of the present invention;
fig. 8 is a schematic circuit connection diagram of a sensor module, a sensor power supply unit and a signal processing module according to an embodiment of the present invention.
Wherein: 1. a fixing plate; 2. the plate was measured.
Detailed Description
In order to make the technical solution better understood by those skilled in the art, the technical solution in the embodiment of the present invention will be clearly described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present disclosure without any creative effort shall fall within the protection scope of the present disclosure.
The terms "include" and any other variations in the description and claims of this document and the above-described figures, mean "including but not limited to", and are intended to cover non-exclusive inclusions. Furthermore, the terms "first" and "second," etc. are used to distinguish between different objects and are not used to describe a particular order.
Implementations of the present invention are described in detail below with reference to the following detailed drawings:
fig. 1 illustrates a merchandise monitoring system according to an embodiment of the present invention, and for convenience of illustration, only the portions related to the embodiment of the present invention are shown, and the detailed description is as follows:
as shown in fig. 1, a commodity monitoring system provided by an embodiment of the present invention is applied to a shelf, and includes: a power module 110, a sensor module 120, a signal processing module 130, a control module 140 and an external communication module 150;
the sensor module 120 is connected to the signal processing module 130, the signal processing module 130 is connected to the control module 140, the control module 140 is connected to the external communication module 150, and the power supply module 110 is connected to the sensor module 120, the signal processing module 130, the control module 140, and the external communication module 150, respectively;
the sensor module 120 is installed on a shelf, the sensor module 120 obtains pressure borne by the shelf and processes the pressure to output a voltage signal, the signal processing module 130 converts the voltage signal into a frequency signal, the control module 140 analyzes the frequency signal to obtain a pressure variation and calculates a quantity change of goods on the shelf according to the pressure variation, and the external communication module 150 transmits the quantity change to external communication equipment.
In the present embodiment, the sensor module 120 is a resistance strain gauge sensor, and changes the resistance value of the resistance strain gauge sensor due to the change in the quality of the goods on the shelf, and further changes the output voltage of the resistance strain gauge sensor.
In this embodiment, the control module 140 stores information such as the voltage value corresponding to each commodity and the weight of each commodity in advance, and after receiving the frequency signal transmitted by the signal processing module 130, the control module 140 analyzes the frequency signal and converts the frequency signal into a voltage signal, and compares the voltage signal with a preset voltage signal to obtain the voltage variation.
In this embodiment, the external communication module 150 transmits the voltage variation obtained by the control module 140 to the external device, and the voltage variation is displayed by the external device.
In this embodiment, the external device may be a mobile phone, a computer, or the like.
In this embodiment, the commodity monitoring system may be applied to a supermarket shelf to monitor whether the commodities on the supermarket shelf need replenishment or not and to monitor the quantity of the commodities.
In the embodiment of the invention, the weight of the commodities on the supermarket sorting shelf, which is acquired by the sensor module 120, changes of voltage caused by the weight change are analyzed to obtain the change of the commodities on the supermarket sorting shelf, and the commodities needing to be supplemented with the commodities are found in time, so that the automatic monitoring of the commodities in the supermarket is realized.
As shown in fig. 2, in one embodiment of the present invention, the sensor module 120 is disposed on a cantilever beam that is affixed to a supermarket shelf.
In this embodiment, the cantilever beam is T shape structure, the cantilever beam includes fixed plate 1 and measuring board 2, on the fixed plate of measuring board one end, the 2 other ends of measuring board are unsettled, measuring board 2 is tubaeform, fixed plate 1 of cantilever beam is fixed on supermarket reason goods shelves, measuring board 2 corresponds the part with the commodity on the reason goods shelves and contacts, sensor module sets up on measuring the board, measuring the board and including upper plate and hypoplastron, the upper plate sets up on the hypoplastron, upper plate and hypoplastron coincidence set up, sensor module sets up between upper plate and hypoplastron, make the even atress of sensor module ability.
In this embodiment, the section of the cantilever beam along the length direction of the beam changes according to a certain rule, and when the concentrated force F acts on the triangle vertex of the beam, the stress on the section at any distance from the acting point is equal, so the position of attaching the strain gauge in the direction corresponding to the length L is not strict.
As shown in FIG. 3, in one embodiment of the present invention, the inputs of the sensor module 120 include a first input and a second input, and the outputs of the sensor module 120 include a first output and a second output.
In one embodiment of the present invention, the sensor module 120 includes a measuring unit and an adjusting unit;
the first input end of the measurement unit is the first input end of the sensor module 120, the second input end of the measurement unit is the second input end of the sensor module 120, the first output end of the measurement unit is the first output end of the sensor module 120, the second output end of the measurement unit is the second output end of the sensor module 120, the input end of the adjustment unit is connected with the second input end of the measurement unit, the first end of the adjustment unit is connected with the first output end of the measurement unit, and the second end of the adjustment unit is connected with the second output end of the measurement unit;
the measuring unit outputs a voltage signal, and the adjusting unit is adjusted to adjust the output voltage range of the measuring unit.
In the embodiment, the resistance in the measuring unit is changed according to the weight change of the goods on the shelf, and the output voltage signal of the measuring unit is further changed.
In the present embodiment, the adjusting unit is designed to zero the measuring unit to overcome the incomplete symmetry of the manufacturing process, and also serves as a tare circuit. The input potential difference of the measuring unit can be 10V and the output voltage range is 0-15mV through the adjusting unit.
As shown in fig. 3, in one embodiment of the present invention, the measuring unit includes a first resistive strain gauge M1, a second resistive strain gauge M2, a third resistive strain gauge M3, and a fourth resistive strain gauge M4;
the second end of the first resistance strain gauge M1 and the first end of the second resistance strain gauge M2 are connected in common as the first output end of the measuring unit, the second end of the second resistance strain gauge M2 and the first end of the third resistance strain gauge M3 are connected in common as the second input end of the measuring unit, the second end of the third resistance strain gauge M3 and the first end of the fourth resistance strain gauge M4 are connected in common as the second output end of the measuring unit, and the first end of the first resistance strain gauge M1 and the second end of the fourth resistance strain gauge M4 are connected in common as the first input end of the measuring unit.
In the embodiment, the measuring unit adopts a four-arm differential bridge measuring circuit, and the output voltage of the measuring unit is increased by four times compared with that of a single-arm bridge circuit, and meanwhile, the sensitivity is also increased by four times.
In this embodiment, the first and third resistive strain gages M1 and M3 are on the lower surface of the upper plate of the cantilever beam, and the second and fourth resistive strain gages M2 and M4 are on the upper surface of the lower plate of the cantilever beam.
In this embodiment, if the first and fourth resistance strain gauges M1 and M4 are under tension, the second and third resistance strain gauges M2 and M3 will be under compression, and both will be under equal strain but opposite polarity.
As shown in fig. 3, in an embodiment of the present invention, the adjusting unit includes a sliding resistor R1 and a resistor R2;
the first end of the sliding resistor R1 is the first end of the adjusting unit, the second end of the sliding resistor R1 is the second end of the adjusting unit, the first end of the resistor R2 is the input end of the adjusting unit, and the second end of the resistor R2 is connected with the sliding end of the sliding resistor R1.
As shown in fig. 4, in an embodiment of the present invention, the control module 140 includes a microcontroller, a crystal oscillator Y1, a resistor R3, a capacitor C1, a capacitor C2, a capacitor C3, and a switch S1.
The microcontroller is described below with a single chip microcomputer as an example.
An XTA L0 pin of the single chip microcomputer is connected to the first end of the capacitor C1 and the first end of the crystal oscillator Y1, respectively, the second end of the capacitor C1 and the first end of the capacitor C2 are connected to ground, an XTA L1 pin of the single chip microcomputer is connected to the second end of the capacitor C2 and the second end of the crystal oscillator Y1, respectively, a RESET pin of the single chip microcomputer is connected to the first end of the capacitor C3, the first end of the switch S1 and the first end of the resistor R3, the second end of the capacitor C3 and the second end of the switch S1 are connected to a voltage source, the second end of the resistor R3 is connected to ground, and a P3.5 pin of the single chip microcomputer is an input terminal of the control module 140.
In this embodiment, the single chip microcomputer selects the single chip microcomputer of AT89C52 to operate in 11.0592MHZ clock, its P3.5 pin (which is a general function pin) is connected with the frequency signal, and counts the pulse sequence to obtain the frequency information, so as to convert it into the weight value. The P0.0 port and the P2.0 port of the single chip are output ends of the control module 140, wherein the P0.0 port is an 8-bit segment code, and the P2.0 port provides a 5-bit code (5-bit 7-segment digital display).
In this embodiment, the switch may be a reset switch.
As shown in fig. 5, in one embodiment of the present invention, the output terminal of the power module 101 includes a first output terminal and a second output terminal.
As shown in fig. 5, in one embodiment of the present invention, the power module 101 includes a sensor power unit 101; the sensor power supply unit 101 comprises a reference power supply 1101, a first voltage regulation subunit 1102, a second voltage regulation subunit 1103 and a filtering subunit 1104;
a first input terminal of the first voltage regulation subunit 1102 and a first input terminal of the second voltage regulation subunit 1103 are commonly connected to an output terminal of the reference power supply 1101, the input terminal of the reference power source 1101, the second input terminal of the first voltage regulation subunit 1102 and the second input terminal of the second voltage regulation subunit 1103 are connected to a positive power source in common, the third input terminal of the first voltage regulation subunit 1102 and the third input terminal of the second voltage regulation subunit 1103 are commonly connected to a negative power supply, the output terminal of the first voltage-stabilizing subunit 1102 is commonly connected with the first input terminal of the filtering subunit 1104 to form a first output terminal of the sensor power supply unit 101, the output of the second voltage-stabilizing subunit 1103 and the output of the filtering subunit 1104 are connected together to form a second output of the sensor power supply unit 101, a second input terminal of the filtering subunit 1104 is connected to the signal terminal of the second voltage-stabilizing subunit 1103.
In this embodiment, the reference power source 1101 is of type MC1403, and the reference power source 1101 provides a stable, standard voltage source.
In this embodiment, the first voltage regulation subunit 1102 and the second voltage regulation subunit 1103 provide two stable voltage sources for the sensor module 120.
As shown in fig. 5, in an embodiment of the present invention, the first voltage regulation subunit 1102 includes a first amplifier, a first transistor, a resistor R4, a resistor R5, a resistor R6, a resistor R7, and a resistor R20;
a first end of the resistor R4 is a first input end of the first voltage-stabilizing subunit 1102, a second end of the resistor R4 is connected to a first input end of the first amplifier, a second input end of the first amplifier is connected to a first end of the resistor R5 and a first end of the resistor R20, a second end of the resistor R5 is grounded, a positive power terminal of the first amplifier and a collector of the first transistor are connected in common to form a second input end of the first voltage-stabilizing subunit 1102, a negative power terminal of the first amplifier is a third input end of the first voltage-stabilizing subunit 1102, an output end of the first amplifier is connected to a first end of the resistor R7, a second end of the resistor R7 is connected to a base of the first transistor, an emitter of the first transistor and a second end of the resistor R20 are connected in common to form an output end of the first voltage-stabilizing subunit 1102, a controlled end of the resistor R6 is connected to a positive power supply end of the first amplifier, a first end of the resistor R6 is connected to a first connection end of the first amplifier, and a second end of the resistor R6 is connected to a second connection end of the first amplifier.
In this embodiment, the first amplifier model may be OP-07. The first transistor may be of type D536. The resistor R6 is a sliding resistor.
As shown in fig. 5, in an embodiment of the present invention, the second regulator subunit 1103 includes a second amplifier, a second transistor, a resistor R41, a resistor R51, a resistor R61, and a resistor R71;
a first end of the resistor R41 is a first input end of the second regulator subunit 1103, a second end of the resistor R41 is connected to a first input end of the second amplifier, a second input end of the second amplifier is connected to a first end of the resistor R51, a second end of the resistor R51 is grounded, a positive power source end of the second amplifier is a second input end of the second regulator subunit 1103, an output end of the second amplifier is connected to a first end of the resistor R71, a second end of the resistor R71 is connected to a base of the second triode, a collector of the second triode is an output end of the second regulator subunit 1103, a negative power source end of the second amplifier is connected to an emitter of the second triode to form a third input end of the second regulator subunit 1103, a controlled end of the resistor R61 is connected to a positive power source of the second amplifier, a first end of the resistor R61 is connected to the first connection terminal of the second amplifier, and a second end of the resistor R61 is connected to the second connection terminal of the second amplifier.
In this embodiment, the second amplifier model may be OP-07. The second transistor may be of the type C608. The resistor R61 is a sliding resistor.
As shown in fig. 5, in one embodiment of the present invention, D536 and C608 are a pair of complementary pair transistors through which the negative feedback circuits of the first and second amplifiers respectively pass. When the temperature rises, the output voltage of the first amplifier rises, Vbe of D536 rises, and IAB of the measurement unit rises. The output voltage of the second amplifier also rises, which causes the Vbe voltage of C608 to drop, Rec to increase, causing IAB of the measurement unit to drop, and VAB of the measurement unit to be maintained.
As shown in fig. 5, in one embodiment of the present invention, the filtering subunit 1104 includes a resistor R21 and a capacitor C7.
The first terminal of the resistor R21 is the second input terminal of the filtering subunit 1104, the first terminal of the capacitor C7 is the first input terminal of the filtering subunit 1104, and the second terminal of the resistor R21 and the second terminal of the capacitor C7 are connected in common to form the output terminal of the filtering subunit 1104.
As shown in fig. 6, in one embodiment of the present invention, the input terminals of the signal processing module 130 include a first input terminal and a second input terminal.
As shown in fig. 6, in an embodiment of the present invention, the signal processing module 130 includes a signal amplifying unit 301 and a signal converting unit 302;
a first input end of the signal amplifying unit 301 is a first input end of the signal processing module 130, a second input end of the signal amplifying unit 301 is a second input end of the signal processing module 130, an output end of the signal amplifying unit 301 is connected to an input end of the signal converting unit 302, and an output end of the signal converting unit 302 is an output end of the signal processing module 130;
the signal amplifying unit 301 amplifies the voltage signal, and the signal converting unit 302 converts the amplified voltage signal into a frequency signal.
As shown in fig. 6, in an embodiment of the present invention, the signal amplifying unit 301 includes a first signal amplifier, a second signal amplifier, a third signal amplifier, a fourth signal amplifier, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a capacitor C4, a capacitor C5, and a capacitor C6;
the first input end of the first signal amplifier is the first input end of the signal amplifying unit 301, the first input end of the second signal amplifier is the second input end of the signal amplifying unit 301, the second input end of the first signal amplifier is respectively connected to the second end of the resistor R9, the sliding end of the resistor R10, and the first end of the resistor R10, the output end of the first signal amplifier is respectively connected to the first end of the resistor R8 and the first end of the resistor R9, the second end of the resistor R10 is respectively connected to the first end of the resistor R11 and the second input end of the second signal amplifier, the output end of the second signal amplifier is respectively connected to the second end of the resistor R11 and the first end of the resistor R12, the second end of the resistor R12 is respectively connected to the first end of the resistor R13 and the second input end of the third signal amplifier, the second end of the resistor R13 is grounded, the second end of the resistor R8 is respectively connected with the first input end of the third signal amplifier and the first end of the resistor R14, the output end of the third signal amplifier is respectively connected with the second end of the resistor R14 and the first end of the resistor R15, a second end of the resistor R15 is respectively connected with a first end of the resistor R16 and a first end of the capacitor C4, the second end of the capacitor C4 is grounded, the second end of the resistor R16 is respectively connected with the first end of the resistor R17 and the first end of the capacitor C5, a second terminal of the resistor R17 is connected to a first terminal of the capacitor C6 and a first input terminal of the fourth signal amplifier, a second terminal of the capacitor C6 is grounded, and an output terminal of the fourth signal amplifier, a second terminal of the capacitor C5, and a second input terminal of the fourth signal amplifier are commonly connected to an output terminal of the signal amplifying unit 301.
In this embodiment, the first signal amplifier, the second signal amplifier, the third signal amplifier and the fourth signal amplifier may be all of the type IC L7650.
In the embodiment, the first signal amplifier and the second signal amplifier are used for amplifying the voltage signal output by the sensor module, and since the voltage signal output by the sensor module is a low-frequency signal, the first signal amplifier is required to amplify the low-frequency voltage signal; the voltage signal after the first-stage amplification is subjected to denoising, and then the signal is reduced, so a third signal amplifier is needed to amplify the signal; the signal amplified by the third signal amplifier is checked whether the signal meets the requirements or not by the fourth signal amplifier.
In the embodiment, double-end input is adopted to enter in the in-phase ends of the first signal amplifier and the second signal amplifier respectively, so that the input impedance is large, and the common-mode voltage interference is restrained.
As shown in fig. 6, in an embodiment of the present invention, the signal converting unit 302 includes a V/F converter, a flip-flop, an inverter, a resistor R18, and a resistor R19;
the first end of the resistor R18 and the controlled end of the resistor R18 are connected in common to form the input end of the signal conversion unit 302, the second end of the resistor R18 is connected to the 2-pin of the V/F converter, the 4-pin of the V/F converter and the first end of the resistor R19 are connected in common to a positive power supply, the 6-pin of the V/F converter and the second end of the resistor R19 are connected in common to a negative power supply, the 8-pin of the V/F converter is connected to the sliding end of the resistor R19, the 7-pin of the V/F converter is connected to the input end of the flip-flop, the output end of the flip-flop is connected to the input end of the inverter, and the output end of the inverter is the output end of the signal conversion unit 302.
In this embodiment, the V/F converter employs QD4703, the input voltage of the V/F converter is 0-5V, the output frequency is 0-50 KHz, and the nonlinear error is ± 0.02%. The signal conversion unit 302 may be conveniently connected to the microcontroller, occupying only one bit I O of the microcontroller. The output signal from the signal amplification unit 301 goes through a first-stage low-pass filter to filter the spike pulse of the amplifier, and then goes through V/F conversion, wherein V/F is an integration process for the input signal, and at the same time, integrates the interference signal entering the V/F input end, thereby smoothing the interference signal. The output end of the V/F converter outputs 0-5V standard rectangular wave frequency signals, interference signals on the transmission line can be superposed on the rectangular waves, so that the rectangular waves can only be deformed, the effective value of the waveform cannot be changed, the output frequency cannot be changed, and the long-distance transmission is facilitated. The conversion resolution of the V/F conversion is high, 5V 25KHz to 0.2mV/Hz, and the resolution of the 12-bit a/D is 5V4098 to 1.2 mV/Hz.
In the present embodiment, the resistor R18 is a full-scale potentiometer, and the resistor R19 is a zero potentiometer.
In this embodiment, the inverter employs MC 14049. In order to increase the driving capability, 6 input terminals and 6 output terminals of the inverters are connected in parallel, respectively. The process that the analog signal of dozens of millivolts of the weighing sensor is changed into a standard frequency signal of 0-5V from the output end of six inversed phases through a series of measures is completed. The output signal may be sent directly to the microcontroller.
In the present embodiment, the flip-flop is a double J-K flip-flop 74HC 76.
As shown in fig. 7, in one embodiment of the present invention, the external communication module 150 may be a bluetooth communication module.
In this embodiment, the external communication module 150 employs a CONAT62B chip.
As shown in fig. 8, a schematic diagram of a specific connection structure of the sensor module 120, the sensor power supply unit 101, and the signal processing module 130 is given below for ease of understanding.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A merchandise monitoring system, for use with a shelf, comprising: the device comprises a power supply module, a sensor module, a signal processing module, a control module and an external communication module;
the sensor module is connected with the signal processing module, the signal processing module is connected with the control module, the control module is connected with the external communication module, and the power supply module is respectively connected with the sensor module, the signal processing module, the control module and the external communication module;
the sensor module is installed on a shelf, the sensor module acquires pressure borne by the shelf and processes the pressure to output a voltage signal, the signal processing module converts the voltage signal into a frequency signal, the control module analyzes the frequency signal to obtain a pressure variation and calculates the quantity variation of commodities on the shelf according to the pressure variation, and the external communication module transmits the quantity variation to external communication equipment;
the sensor module comprises a measuring unit and an adjusting unit;
the first input end of the measuring unit is the first input end of the sensor module, the second input end of the measuring unit is the second input end of the sensor module, the first output end of the measuring unit is the first output end of the sensor module, the second output end of the measuring unit is the second output end of the sensor module, the input end of the adjusting unit is connected with the second input end of the measuring unit, the first end of the adjusting unit is connected with the first output end of the measuring unit, and the second end of the adjusting unit is connected with the second output end of the measuring unit;
the measuring unit outputs a voltage signal, and the adjusting unit adjusts the output voltage range of the measuring unit.
2. The merchandise monitoring system of claim 1 wherein the measurement unit comprises a first resistive strain gage, a second resistive strain gage, a third resistive strain gage, and a fourth resistive strain gage;
the second end of the first resistance strain gauge and the first end of the second resistance strain gauge are connected together to form a first output end of the measuring unit, the second end of the second resistance strain gauge and the first end of the third resistance strain gauge are connected together to form a second input end of the measuring unit, the second end of the third resistance strain gauge and the first end of the fourth resistance strain gauge are connected together to form a second output end of the measuring unit, and the first end of the first resistance strain gauge and the second end of the fourth resistance strain gauge are connected together to form a first input end of the measuring unit.
3. The merchandise monitoring system of claim 1 wherein the adjustment unit includes a sliding resistor R1 and a resistor R2;
the first end of the sliding resistor R1 is the first end of the adjusting unit, the second end of the sliding resistor R1 is the second end of the adjusting unit, the first end of the resistor R2 is the input end of the adjusting unit, and the second end of the resistor R2 is connected with the sliding end of the sliding resistor R1.
4. The merchandise monitoring system of claim 1 wherein the control module comprises a microcontroller, a crystal oscillator, a resistor R3, a capacitor C1, a capacitor C2, a capacitor C3, and a switch;
the XTA L0 pin of the microcontroller is connected to the first end of the capacitor C1 and the first end of the crystal oscillator, respectively, the second end of the capacitor C1 and the first end of the capacitor C2 are connected to ground, the XTA L1 pin of the microcontroller is connected to the second end of the capacitor C2 and the second end of the crystal oscillator, respectively, the RESET pin of the microcontroller is connected to the first end of the capacitor C3, the first end of the switch, and the first end of the resistor R3, the second end of the capacitor C3 and the second end of the switch are connected to a voltage source, the second end of the resistor R3 is connected to ground, and the P3.5 pin of the microcontroller is an input terminal of the control module.
5. The item monitoring system of claim 1, wherein the power module comprises a sensor power unit; the sensor power supply unit comprises a reference power supply, a first voltage-stabilizing subunit, a second voltage-stabilizing subunit and a filtering subunit;
the first input end of the first voltage-stabilizing subunit and the first input end of the second voltage-stabilizing subunit are connected with the output end of the reference power supply in a common way, the input end of the reference power supply, the second input end of the first voltage-stabilizing subunit and the second input end of the second voltage-stabilizing subunit are connected with a positive power supply in a common way, the third input end of the first voltage-stabilizing subunit and the third input end of the second voltage-stabilizing subunit are connected with a negative power supply in a common way, the output end of the first voltage-stabilizing subunit and the first output end of the filtering subunit are connected together to form a first output end of the sensor power supply unit, the output end of the second voltage-stabilizing subunit and the second output end of the filtering subunit are connected together to form a second output end of the sensor power supply unit, and the input end of the filtering subunit is connected with the signal end of the second voltage-stabilizing subunit.
6. The merchandise monitoring system of claim 5 wherein the first voltage regulation subunit comprises a first amplifier, a first transistor, a resistor R4, a resistor R5, a resistor R6, a resistor R7, and a resistor R20;
a first end of the resistor R4 is a first input end of the first voltage-stabilizing subunit, a second end of the resistor R4 is connected to a first input end of the first amplifier, a second input end of the first amplifier is connected to a first end of the resistor R5 and a first end of the resistor R20, a second end of the resistor R5 is grounded, a positive power terminal of the first amplifier and a collector of the first transistor are connected in common to form a second input end of the first voltage-stabilizing subunit, a negative power terminal of the first amplifier is a third input end of the first voltage-stabilizing subunit, an output end of the first amplifier is connected to a first end of the resistor R7, a second end of the resistor R7 is connected to a base of the first transistor, an emitter of the first transistor and a second end of the resistor R20 are connected in common to form an output end of the first voltage-stabilizing subunit, a controlled end of the resistor R6 is connected to a positive power terminal of the first amplifier, a first end of the resistor R6 is connected to the first connection terminal of the first amplifier, and a second end of the resistor R6 is connected to the second connection terminal of the first amplifier.
7. The merchandise monitoring system of claim 1 wherein the signal processing module comprises a signal amplification unit and a signal conversion unit;
the first input end of the signal amplification unit is the first input end of the signal processing module, the second input end of the signal amplification unit is the second input end of the signal processing module, the output end of the signal amplification unit is connected with the input end of the signal conversion unit, and the output end of the signal conversion unit is the output end of the signal processing module;
the signal amplification unit amplifies the voltage signal, and the signal conversion unit converts the amplified voltage signal into a frequency signal.
8. The merchandise monitoring system of claim 7 wherein the signal amplification unit comprises a first signal amplifier, a second signal amplifier, a third signal amplifier, a fourth signal amplifier, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a capacitor C4, a capacitor C5, a capacitor C6;
the first input end of the first signal amplifier is the first input end of the signal amplifying unit, the first input end of the second signal amplifier is the second input end of the signal amplifying unit, the second input end of the first signal amplifier is respectively connected with the second end of the resistor R9, the sliding end of the resistor R10 and the first end of the resistor R10, the output end of the first signal amplifier is respectively connected with the first end of the resistor R8 and the first end of the resistor R9, the second end of the resistor R10 is respectively connected with the first end of the resistor R11 and the second input end of the second signal amplifier, the output end of the second signal amplifier is respectively connected with the second end of the resistor R11 and the first end of the resistor R12, and the second end of the resistor R12 is respectively connected with the first end of the resistor R13 and the second input end of the third signal amplifier, the second end of the resistor R13 is grounded, the second end of the resistor R8 is respectively connected with the first input end of the third signal amplifier and the first end of the resistor R14, the output end of the third signal amplifier is respectively connected with the second end of the resistor R14 and the first end of the resistor R15, a second end of the resistor R15 is respectively connected with a first end of the resistor R16 and a first end of the capacitor C4, the second end of the capacitor C4 is grounded, the second end of the resistor R16 is respectively connected with the first end of the resistor R17 and the first end of the capacitor C5, a second terminal of the resistor R17 is connected to a first terminal of the capacitor C6 and a first input terminal of the fourth signal amplifier, the second terminal of the capacitor C6 is grounded, and the output terminal of the fourth signal amplifier, the second terminal of the capacitor C5, and the second input terminal of the fourth signal amplifier are commonly connected to the output terminal of the signal amplifying unit.
9. The merchandise monitoring system of claim 7 wherein the signal conversion unit comprises a V/F converter, a flip-flop, an inverter, a resistor R18, a resistor R19;
the first end of the resistor R18 and the controlled end of the resistor R18 are connected in common to form the input end of the signal conversion unit, the second end of the resistor R18 is connected with the 2 pin of the V/F converter, the 4 pin of the V/F converter and the first end of the resistor R19 are connected in common to a positive power supply, the 6 pin of the V/F converter and the second end of the resistor R19 are connected in common to a negative power supply, the 8 pin of the V/F converter is connected with the sliding end of the resistor R19, the 7 pin of the V/F converter is connected with the input end of the trigger, the output end of the trigger is connected with the input end of the inverter, and the output end of the inverter is the output end of the signal conversion unit.
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| CN102623061A (en) * | 2012-03-27 | 2012-08-01 | 上海宏力半导体制造有限公司 | Voltage stabilizing circuit for inhibition voltage of storage |
| BR102013017272A2 (en) * | 2013-07-04 | 2015-08-25 | Marcelo Nunes Bastos | Content / product monitoring and management system, packed and loaded by transport vehicles |
| CN103398807B (en) * | 2013-08-12 | 2016-04-20 | 中交一公局土木工程建筑研究院有限公司 | A kind of novel three-dimensional stress measurement sensor |
| KR102568097B1 (en) * | 2015-06-22 | 2023-08-18 | 삼성전자 주식회사 | Electronic device and method for displaying related information of parsed data |
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