CN105486392A - Small electronic weighing system based on single-chip microcomputer - Google Patents
Small electronic weighing system based on single-chip microcomputer Download PDFInfo
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- CN105486392A CN105486392A CN201610036017.1A CN201610036017A CN105486392A CN 105486392 A CN105486392 A CN 105486392A CN 201610036017 A CN201610036017 A CN 201610036017A CN 105486392 A CN105486392 A CN 105486392A
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- module
- chip microcomputer
- small electronic
- weighing system
- electronic weighing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/40—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight
- G01G19/413—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means
- G01G19/414—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means using electronic computing means only
Abstract
The invention discloses a small electronic weighing system based on a single-chip microcomputer. The small electronic weighing system comprises a display module, an A/D conversion module and a communication module which are connected with a single-chip microcomputer master controller. The A/D conversion module is connected with a pressure sensing module. The maximum output voltage of the pressure sensing module is 7-14mV. A conditioning circuit is connected between the A/D conversion module and the pressure sensing module. The display module is used for displaying weight information and fault information. The single-chip microcomputer master controller is also connected with an alarm module which is used for performing sound-light alarm when data acquired by the pressure sensing module is higher than a threshold or a fault occurs. The communication module is connected with an upper computer through wired or wireless connection and used for data transmission. The system is simple in structure, convenient to use and high in precision, and can meet weighing of small measuring range and can perform display of measured data information, weight overload alarm and long-distance data transmission.
Description
Technical field
The present invention relates to a kind of electronic weighing system, relate to the SCM Based small electronic weighing system that a kind of range is little, precision is high particularly.
Background technology
The 21 century of great achievement is obtained at electronic science and technology, electronic product becomes and becomes increasingly abundant, not only permeate the social every field such as agricultural, industry, business, communications and transportation, scientific research, and greatly promote the progress of social development and science and technology.Electronic scales is a kind of electronic scales of modern electronic product, is the electronic weighting equipment adopting Modern Sensor Technology, electronic technology and computer technology integration.The invention of electronic scales has immeasurable effect to scientific research, domestic and foreign trade, national economy, national defense construction, become indispensable metering outfit in these fields, also be widely used in supermarket, big and middle market, logistics distribution center, become requisite article in people's daily life, bring great convenience to the life of people, study, work.To 21 century, due to the development of digital integrated circuit technology and the continuous breakthrough of LOAD CELLS properties, solid foundation has been established in the development for electronic scales.Compare traditional mechanical type lever and the meausring apparatus of blade, electronic scale has that weighing precision is high, volume is little, applied range, be easy to operation, be convenient to the advantages such as valuation, overcome the out of true of traditional steelyard, platform scale and pan scale, speed slow, need the shortcoming that artificially valuate.
Chinese patent literature CN201532555 discloses a kind of monolithic processor controlled high-precision weighing control device, be interconnected by communication interface (1) and single-chip microcomputer (4), A/O converter (2) is connected to single-chip microcomputer (4), LOAD CELLS (3) is connected to A/O converter (2), keyboard (5) is connected to single-chip microcomputer (4), and single-chip microcomputer (4) is connected to liquid crystal display (6) and sound prompt device (7).Utilize the high-acruracy survey that single-chip microcomputer and sensor realize weight, but the range that this kind of weighing control device can only be measured generally must be very large, measure lightweight object, the non-constant of precision.
Summary of the invention
In order to solve the problems of the technologies described above, the present invention seeks to: a kind of SCM Based small electronic weighing system is provided, this system architecture is simple, easy to use, the weighing of small-range scope can be met, precision is high, can the data message of display measurement, weight is overweight warning, Long-range Data Transmission.
Technical scheme of the present invention is:
A kind of SCM Based small electronic weighing system, is characterized in that, comprise the display module, A/D modular converter and the communication module that are connected with single-chip microcomputer master controller; Described A/D modular converter Bonding pressure sensing module, the maximum voltage that described pressure sensor block exports is 7-14mV, described A/D modular converter is connected modulate circuit with between pressure sensor block, described display module is for showing weight information and failure message, described single-chip microcomputer master controller also connects alarm module, described alarm module is used for carrying out sound and light alarm when the data of pressure sensor block collection higher than threshold value or when breaking down, described communication module by wired or wireless connections host computer, for transmitting data.
Preferably, described modulate circuit comprises the first modulate circuit and the second modulate circuit.
Preferably, described alarm module comprises voice module and is arranged at the multi-colour LED of system surfaces.
Preferably, described single-chip microcomputer master controller connects electrochemical capacitor and resistance, and described electrochemical capacitor is 10 μ F, and resistance is 10k Ω.
Preferably, described single-chip microcomputer master controller connects reset circuit.
Preferably, described single-chip microcomputer master controller connects free-standing button or scan-type key circuit.
Preferably, also comprise power module, described power module adopts three terminal regulator, and described three terminal regulator connects at least one low frequency filtering electric capacity and high-frequency filter capacitor.
Compared with prior art, advantage of the present invention is:
1, this system architecture is simple, easy to use, and can meet the weighing of small-range scope, precision is high, can the data message, weight is overweight warning, Long-range Data Transmission etc. of display measurement.
2, use two modulate circuits the output signal of pressure sensor block can be amplified to controlled multiple, make measurement more accurate; When the data of pressure sensor block collection carry out sound and light alarm higher than threshold value or when breaking down, prevent instrument damage.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is the structured flowchart of the small electronic weighing system that the present invention is based on single-chip microcomputer;
Fig. 2 is the minimum system structure principle chart of single-chip microcomputer main control of the present invention;
Fig. 3 is the circuit theory diagrams of A/D converter in embodiment;
Fig. 4 is the circuit theory diagrams of the first modulate circuit in embodiment;
Fig. 5 is the circuit theory diagrams that in embodiment, hummer drives;
Fig. 6 is the circuit theory diagrams of communication module in embodiment;
Fig. 7 is the circuit theory diagrams of three terminal regulator in embodiment;
Fig. 8 is the circuit theory diagrams of DC-DC converter in embodiment;
Fig. 9 is the circuit theory diagrams of reference bit in embodiment.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment also with reference to accompanying drawing, the present invention is described in more detail.Should be appreciated that, these describe just exemplary, and do not really want to limit the scope of the invention.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present invention.
Embodiment:
As shown in Figure 1, a kind of SCM Based small electronic weighing system, comprises the display module, A/D modular converter and the communication module that are connected with single-chip microcomputer master controller; A/D modular converter Bonding pressure sensing module, the maximum voltage that pressure sensor block exports is 7mV, A/D modular converter is connected modulate circuit with between pressure sensor block, modulate circuit comprises the first modulate circuit and the second modulate circuit, first modulate circuit amplifies the signal that pressure sensor block exports, and the second modulate circuit carries out filtering or buffering to the signal exported.
Display module is for showing weight information and failure message, single-chip microcomputer master controller also connects alarm module, alarm module is used for carrying out sound and light alarm when the data of pressure sensor block collection higher than threshold value or when breaking down, communication module by wired or wireless connections host computer, for transmitting data.
Also comprise power module, power module adopts three terminal regulator, and three terminal regulator connects at least one low frequency filtering electric capacity and high-frequency filter capacitor.
As shown in Figure 2, single-chip microcomputer master controller adopts AT89S51 as master controller, the crystal oscillator of external 11.0592M.
Reset: adopt electrification reset mode or reset circuit.Be made up of 10 μ F/16V electrochemical capacitors and 10k/4W resistance.Necessary power-off restoration after single chip microcomputer halt, but just can power on after a period of time and capacitor discharge must be waited after power-off to complete.Namely the capacity of electric capacity must ensure discharge time.This part also can use special reset circuit module such as watchdog chip.After single-chip microcomputer enters deadlock state, house dog can force monolithic processor resetting, and house dog itself is a monostable time delay circuit, ensures monostable state.
P0 mouth connects key circuit, and key circuit can be free-standing button and scan-type button.Stand alone type button connects at most 8 buttons, and scan-type connects at most 16 buttons.P0 mouth is the state that a drain electrode opens leakage, causes P0 mouth to export high level.So P0 mouth connects, A103G exclusion is upper arrives VCC.
Display module adopts lattice lcd LCM12864 display.The information such as the image of maximum 128 × 64, Chinese character, character can be shown.It is specifically intended that backlight electric power 19 and 20 pin of liquid crystal.19 resistance meeting 100 Ω meet VCC, 20 pin ground connection.If connect anti-, then the Soft Roll chip after LCM12864 can be very boiling hot, even burns.
As shown in Figure 3, A/D converter part adopts 16 ∑-△ type AD type AD converter AD7705.Adopt 5 line connected modes.P2.0, P2.1, P2.2, P2.3, P2.4, P2.5 of single-chip microcomputer are connected with DIN, the DOUT of AD7705 ,/REDY, SCLK ,/CS ,/RESET respectively.External 4.9512M crystal oscillator.REF(+) IN and REF(-) IN connect respectively power supply+5V and ground.
As shown in Figure 4, the first modulate circuit use AD620AN, AD620AN to be enlargement factor 1 ~ 1000 low power consumption high-precision measuring amplifier.Its enlargement factor is controlled by an external precision resistance.
As shown in Figure 5, voice module can be hummer, and the control of hummer adopts P12 pin to control, and principle of work is: when P12 connects high level, NPN base potential is pronounced higher than emitter triode ON hummer.
As shown in Figure 6, communication module is that light isolates 485 circuit SP485, for data are passed to host computer, is convenient to upper computer software processing single chip information.
As shown in Figure 7 ,+5V part adopts three terminal regulator 7805 to provide.+ 5V can give single-chip microcomputer and other chip power supplies, and-5V mainly powers to AD620, and amplifier adopts dual power supply.Three terminal regulator both sides respectively low frequency filtering electric capacity C11 and C13, C11 and C13 in parallel to be respectively alminium electrolytic condenser better to low frequency part filtering, because alminium electrolytic condenser is that aluminium foil rolls and forms, there is certain capacitive reactance.Undesirable to high-frequency effect filtering.So each bulky capacitor back is with a little ceramic disc capacitor or mica capacitor C10 and C12, reach the better filter effect of high and low frequency.D1 is the power supply instruction of+5V.Resistance R8 plays the effect of dividing potential drop current limliting.As shown in Figure 8, DC-DC converter ICL7660S is adopted to provide-5V voltage, for amplifier is powered.
As shown in Figure 9, " " be exactly the reference point of 0 current potential.It is the common port in forming circuit loop.It has again digitally and in analog point.What is called is in analog: 0 potential reference point of amplifier and sampling holder and comparer, A/D converter.What is called is digitally: also crying logically, is digital circuit potential reference point.Digitally and in analog must separate in high request circuit.A bit two kinds of ground are coupled together in system.
Realize one point earth method and have multiple method:
1) connect with magnetic bead: only have squelch effect to certain frequency band.
2) connect with electric capacity: stopping direct current is logical to be exchanged, and easily causes floating ground.
3) connect with inductance: volume is large, unstable.
4) connect with 0 Ohmage.0 Ohmage is used to realize single-point grounding in this circuit.0 Europe resistance is equivalent to very narrow current path, effectively can limit loop current, and noise is inhibited.Resistance has attenuation on all frequency bands.
Should be understood that, above-mentioned embodiment of the present invention only for exemplary illustration or explain principle of the present invention, and is not construed as limiting the invention.Therefore, any amendment made when without departing from the spirit and scope of the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.In addition, claims of the present invention be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.
Claims (7)
1. a SCM Based small electronic weighing system, is characterized in that, comprises the display module, A/D modular converter and the communication module that are connected with single-chip microcomputer master controller; Described A/D modular converter Bonding pressure sensing module, the maximum voltage that described pressure sensor block exports is 7-14mV, described A/D modular converter is connected modulate circuit with between pressure sensor block, described display module is for showing weight information and failure message, described single-chip microcomputer master controller also connects alarm module, described alarm module is used for carrying out sound and light alarm when the data of pressure sensor block collection higher than threshold value or when breaking down, described communication module by wired or wireless connections host computer, for transmitting data.
2. SCM Based small electronic weighing system according to claim 1, is characterized in that, described modulate circuit comprises the first modulate circuit and the second modulate circuit.
3. SCM Based small electronic weighing system according to claim 1, is characterized in that, described alarm module comprises voice module and is arranged at the multi-colour LED of system surfaces.
4. SCM Based small electronic weighing system according to claim 1, is characterized in that, described single-chip microcomputer master controller connects electrochemical capacitor and resistance, and described electrochemical capacitor is 10 μ F, and resistance is 10k Ω.
5. SCM Based small electronic weighing system according to claim 1, is characterized in that, described single-chip microcomputer master controller connects reset circuit.
6. SCM Based small electronic weighing system according to claim 1, is characterized in that, described single-chip microcomputer master controller connects free-standing button or scan-type key circuit.
7. SCM Based small electronic weighing system according to claim 1, is characterized in that, also comprise power module, and described power module adopts three terminal regulator, and described three terminal regulator connects at least one low frequency filtering electric capacity and high-frequency filter capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610036017.1A CN105486392A (en) | 2016-01-20 | 2016-01-20 | Small electronic weighing system based on single-chip microcomputer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610036017.1A CN105486392A (en) | 2016-01-20 | 2016-01-20 | Small electronic weighing system based on single-chip microcomputer |
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| CN105486392A true CN105486392A (en) | 2016-04-13 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106052830A (en) * | 2016-08-17 | 2016-10-26 | 合肥耀贝软件开发有限公司 | High-precision electronic scale based on AVR single-chip microcomputer |
| CN107491004A (en) * | 2017-08-09 | 2017-12-19 | 北京特种机械研究所 | Intelligent weighing tester and its application method |
| CN108414353A (en) * | 2018-01-15 | 2018-08-17 | 沈阳兴华航空电器有限责任公司 | Force-sensing circuit |
| CN110604387A (en) * | 2019-02-26 | 2019-12-24 | 蚌埠学院 | Pressure detection reminding comb |
| CN110604500A (en) * | 2019-03-19 | 2019-12-24 | 蚌埠学院 | Back of body of bathing of voiced sound suggestion is brushed |
| CN112556816A (en) * | 2020-12-10 | 2021-03-26 | 深圳市道中创新科技有限公司 | Weighing system and weighing method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106052830A (en) * | 2016-08-17 | 2016-10-26 | 合肥耀贝软件开发有限公司 | High-precision electronic scale based on AVR single-chip microcomputer |
| CN107491004A (en) * | 2017-08-09 | 2017-12-19 | 北京特种机械研究所 | Intelligent weighing tester and its application method |
| CN108414353A (en) * | 2018-01-15 | 2018-08-17 | 沈阳兴华航空电器有限责任公司 | Force-sensing circuit |
| CN110604387A (en) * | 2019-02-26 | 2019-12-24 | 蚌埠学院 | Pressure detection reminding comb |
| CN110604500A (en) * | 2019-03-19 | 2019-12-24 | 蚌埠学院 | Back of body of bathing of voiced sound suggestion is brushed |
| CN112556816A (en) * | 2020-12-10 | 2021-03-26 | 深圳市道中创新科技有限公司 | Weighing system and weighing method |
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Application publication date: 20160413 |
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