CN206546200U

CN206546200U - A kind of SCM Based electronics scale control system

Info

Publication number: CN206546200U
Application number: CN201621473409.6U
Authority: CN
Inventors: 朱黎; 桂淮濛
Original assignee: Shaanxi Polytechnic Institute
Current assignee: Shaanxi Polytechnic Institute
Priority date: 2016-12-30
Filing date: 2016-12-30
Publication date: 2017-10-10
Anticipated expiration: 2026-12-30

Abstract

The utility model discloses a kind of SCM Based electronics scale control system, including：Minimum system plate, data acquisition device, human-computer interaction interface, integrated data-storage and singlechip controller on the minimum system plate, the data acquisition device includes level processor and A/D converter before pressure sensor, signal, and the human-computer interaction interface includes input through keyboard circuit and display circuit；The data storage is connected with singlechip controller, level processor before the output end connection signal of the pressure sensor, the output end connection A/D converter of level processor before the signal, the output end connection singlechip controller of the A/D converter, the output end connection singlechip controller of the input through keyboard circuit, the output end connection display circuit of the singlechip controller.The utility model is controlled using single-chip microcomputer to electronic scale, and circuit structure is simple, and cost is low.

Description

A kind of SCM Based electronics scale control system

Technical field

The utility model is related to weighing-appliance field, and in particular to a kind of SCM Based electronics scale control system.

Background technology

Electronic scale carries out more accurate weight measurement by electronic weight sensor, is commercially widely used.But mesh Preceding some electronic scale measurement accuracy on the market are not high, normally done business to user and bring problems.Some electronic scale products Complicated, maintenance trouble can influence daily business.

Utility model content

Technical problem to be solved in the utility model is, for above-mentioned deficiency of the prior art, to disclose a kind of base In the electronics scale control system of single-chip microcomputer.

The utility model solves the technical scheme that its technical problem used：

A kind of SCM Based electronics scale control system, including：Minimum system plate, data acquisition device, man-machine interaction Integrated data-storage and singlechip controller on interface, the minimum system plate, the data acquisition device are passed including pressure Level processor and A/D converter before sensor, signal, the human-computer interaction interface include input through keyboard circuit and display circuit；

The data storage is connected with singlechip controller, at the output end connection signal prime of the pressure sensor Manage the output end connection A/D converter of level processor before device, the signal, the output end connection single-chip microcomputer of the A/D converter Controller, the output end connection singlechip controller of the input through keyboard circuit, the output end connection of the singlechip controller Display circuit.

Further, the singlechip controller uses the single-chip microcomputer of AT89S51 models.

Further, the pressure sensor uses L-PSIII type sensors.

Further, level processor uses the amplifier of INA126 models or the amplification of INA121 models before the signal Device.

Further, the A/D converter uses biproduct parting A/D converter.

The beneficial effects of the utility model are：The utility model uses single-chip microcomputer for control core, realizes the base of electronic scale This control function.By setting the symmetrical heavy articles of pressure sensor to carry out Weight acquisition, by signal prime process circuit to adopting The pressure information of collection is amplified filtering, is then converted to digital letter by filtered analog signal is amplified by A/D converter Number it is conveyed in singlechip controller, weighing-up wave can be set by input through keyboard circuit, sets single according to product is corresponding Valency and weight of weighing obtain total price by singlechip controller, and the data message of acquisition is shown by display circuit Come, be easy to check, the utility model is controlled electronic scale using single-chip microcomputer, circuit structure is simple, and cost is low.

Brief description of the drawings

Fig. 1 be the utility model proposes a kind of SCM Based electronic scale control system architecture figure；

Fig. 2 be the utility model proposes the singlechip controller circuit diagram；

Fig. 3 be the utility model proposes the button inputting circuits figure；

Fig. 4 be the utility model proposes the signal preamplifying circuit figure；

Fig. 5 be the utility model proposes the A/D converter circuit diagram.

Embodiment

Below in conjunction with the accompanying drawings and embodiment describes the utility model embodiment：

Referring to Fig. 1 be the utility model proposes a kind of SCM Based electronic scale control system architecture figure.

As shown in figure 1, a kind of SCM Based electronics scale control system, including：Minimum system plate, data acquisition dress Put, human-computer interaction interface, integrated data-storage and singlechip controller, the data acquisition device on the minimum system plate Including level processor and A/D converter before pressure sensor, signal, the human-computer interaction interface includes input through keyboard circuit and aobvious Show circuit；

In the utility model embodiment, use single-chip microcomputer for control core, realize the basic control function of electronic scale.System Including minimum system plate, data acquisition, human-computer interaction interface three parts.Minimum system part, which is mainly, extends external data Memory, prime processing and A/D conversion portion of the part of data acquisition by pressure sensor, signal is constituted.

Man-machine interface part is that input through keyboard and 128 × 64 dot lcds are shown, can intuitively show Chinese, use It is convenient.The SCM Based electronics scale control system that the utility model is provided, it is possible to achieve basic function of weighing, accumulative meter Take function, peeling function and the function of showing shopping list, the unit price of 10 kinds of commodity can be set, because system resource is rich Richness, can also easily extend its application.

The utility model handles electricity by setting the symmetrical heavy articles of pressure sensor to carry out Weight acquisition by signal prime Road is amplified filtering to the pressure information of collection, is then converted to by A/D converter by filtered analog signal is amplified Data signal is conveyed in singlechip controller, and weighing-up wave can be set by input through keyboard circuit, corresponding according to product Set unit price and weight of weighing to obtain total price by singlechip controller, and the data message of acquisition is shown by display circuit Show to come, be easy to check, the utility model collection single-chip microcomputer is controlled to electronic scale, and circuit structure is simple, and cost is low.

Referring to Fig. 2 to Fig. 5, wherein Fig. 2 be the utility model proposes the singlechip controller circuit diagram；Fig. 3 is this The shown button inputting circuits figure that utility model is proposed；Fig. 4 be the utility model proposes the signal preamplifying circuit figure； Fig. 5 be the utility model proposes the A/D converter circuit diagram.

As shown in Figures 2 to 5, singlechip controller uses the single-chip microcomputer of AT89S51 models；Pressure sensor uses L- PSIII type sensors；Level processor is using the amplifier of INA126 models or the amplifier of INA121 models before signal.

Pressure sensor is mainly made up of elastomer, resistance strain gage cable, and internal wiring uses Huygens's electric bridge, adopts Range 20Kg can be realized with L-PSIII types sensor, precision is 0.01%, error ± 0.002Kg during full scale.

The voltage signal of pressure sensor output is millivolt level, so very high is required to operational amplifier, it is new in this practicality In type embodiment, using meter specially amplifier chip, amplifier, the amplification of INA121 models of INA126 models can be used The amplifier of device or other models, such chip internal uses differential input, and common-mode rejection ratio is high, differential-mode input impedance is big, increase The beneficial high, linearity is good, and external interface circuit is simple.

Further, the A/D converter uses biproduct parting A/D converter.

In the utility model embodiment, A/D converter uses biproduct parting A/D converter, for example with ICL7135, greatly The big requirement for reducing filter circuit, with stronger antijamming capability and accurate Differential Input, price is low.

In the utility model embodiment, input through keyboard circuit uses Keyboard management chip 74C922, using the Keyboard management Chip, it is possible to achieve 16 key-press matrix groups on electronic scale are configured, wherein 0-9 numerical keys are used to input unit price and business Product code, DEL is emptied for unit price, is added up key and is added up for expense, peeling key is removed the peel for weight, in addition to a shift key And ESC Escape.

74C922 manufactures for CMOS technology technology, and operating voltage is 3-15V, and " two key locks " function, coding is output as three Core is exported, and directly can be connected with microprocessor data line, and internal oscillator completes 4 × 4 rectangle keyboard scans, when having button, DA Uprise, AT89C51 INT1 mouths are connected to by NOT gate, and set INT1 as edging trigger mode, when DA is uprised, by NOT gate It is changed into low transition and produces INT1 external interrupts, AT89S51 is read key value from data/address bus, judges key assignments to complete phase The program function answered.According to wiring diagram and 74C922 chip truth tables, we can by numerical key 0-9, key DEL, shift key, One-to-one relation, wiring diagram See Figure are set up in ESC Escape, accumulation key and peeling key and ABCD outputs (0000-1111).

The utility model preferred embodiment is explained in detail above in conjunction with accompanying drawing, but the utility model is not limited to Above-mentioned embodiment, in the knowledge that those of ordinary skill in the art possess, can also not depart from the utility model Made a variety of changes on the premise of objective.

Many other changes and remodeling can be made by not departing from spirit and scope of the present utility model.It should be appreciated that this reality Specific embodiment is not limited to new, scope of the present utility model is defined by the following claims.

Claims

1. a kind of SCM Based electronics scale control system, it is characterised in that including：Minimum system plate, data acquisition device, Integrated data-storage and singlechip controller on human-computer interaction interface, the minimum system plate, the data acquisition device bag Level processor and A/D converter before pressure sensor, signal are included, the human-computer interaction interface includes input through keyboard circuit and display Circuit；

The data storage is connected with singlechip controller, the output end connection signal prime processing of the pressure sensor The output end connection A/D converter of level processor before device, the signal, the output end connection single-chip microcomputer control of the A/D converter Device processed, the output end connection singlechip controller of the input through keyboard circuit, the output end connection of the singlechip controller is aobvious Show circuit；The singlechip controller uses the single-chip microcomputer of AT89S51 models.

2. a kind of SCM Based electronics scale control system according to claim 1, it is characterised in that the pressure is passed Sensor uses L-PSIII type sensors.

3. a kind of SCM Based electronics scale control system according to claim 1, it is characterised in that before the signal Level processor is using the amplifier of INA126 models or the amplifier of INA121 models.

4. a kind of SCM Based electronics scale control system according to claim 1, it is characterised in that the A/D turns Parallel operation uses biproduct parting A/D converter.