CN107631787A - A kind of SCM Based electronic scale - Google Patents
A kind of SCM Based electronic scale Download PDFInfo
- Publication number
- CN107631787A CN107631787A CN201610562546.5A CN201610562546A CN107631787A CN 107631787 A CN107631787 A CN 107631787A CN 201610562546 A CN201610562546 A CN 201610562546A CN 107631787 A CN107631787 A CN 107631787A
- Authority
- CN
- China
- Prior art keywords
- present
- function
- circuit
- electronic scale
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
Abstract
Patent of the present invention is related to a kind of SCM Based electronic scale, the present invention is using AT89S52 single-chip microcomputers as main control chip, periphery is accompanied by weighing circuit, display circuit, warning circuit, keyboard circuit etc. and forms intelligent weighing system circuit board, so as to realize the function of weighing of automatic weighing system, warning function, data computing function and human-computer exchange function.According to the requirement of design function of the present invention, present invention design is broadly divided into five modules：Data acquisition module, signal amplification module, analog-to-digital conversion module, single chip control module, human-machine exchange module.This invention designs completed electronic scale and largely meets application demand.
Description
Technical field
Patent of the present invention is related to singlechip technology field, and in particular to a kind of SCM Based electronic scale.
Background technology
Traditional mechanical scale has disadvantages that, for example precision is not high, complicated, easy to aging, cost height etc..With society
Development, all kinds of portable small-sized scales of the more and more higher of requirement of the market to scale, especially human body balance, kitchen scale etc..Electronic scale
Had many advantages compared with traditional mechanical scale, it substitutes the spring of mechanical scale to substantially reduce the body of scale with pressure sensor
Product and manufacture difficulty, traditional dial is substituted to make profile more attractive in appearance with LCD or LED display, due to being internally integrated list
Piece machine and software systems, electronic scale also possess incomparable intelligent of tradition machinery scale.He can complete overload-alarm, always
Valency calculates, numerous functions such as data communication.
Weighing instrument currently used in the market, either complicated or operation is unreliable, and cost is high, and whole
Body level is not high, and part small business is of poor quality and technology is weak, and equipment is not complete, lacks the development ability of product, product quality
Low-level.Therefore, targetedly develop a set of electronic scale system with practical value, technically overcome on
Shortcomings are stated, improves the weak point in electronic scale application, there is realistic meaning.
Patent of invention content
Patent of the present invention is related to a kind of SCM Based electronic scale, and the present invention is using AT89S52 single-chip microcomputers as main control chip, periphery
It is accompanied by weighing circuit, display circuit, warning circuit, keyboard circuit etc. and forms intelligent weighing system circuit board, it is automatic so as to realize
Function of weighing, warning function, data computing function and the human-computer exchange function of weighing system.According to design function of the present invention
It is required that present invention design is broadly divided into five modules：Data acquisition module, signal amplification module, analog-to-digital conversion module, monolithic
Machine control module, human-machine exchange module.This invention designs completed electronic scale and largely meets application demand.
Brief description of the drawings
Fig. 1：Mentality of designing block diagram.
Fig. 2：Matrix keyboard figure.
Fig. 3：HJ12864ZW pictorial diagrams.
Embodiment
In order that the object, technical solution and advantage of patent of the present invention are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, patent of the present invention is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
Patent of the present invention, is not intended to limit the present invention patent.
Patent of the present invention is related to a kind of SCM Based electronic scale, of the invention using AT89S52 single-chip microcomputers as main control chip,
Periphery is accompanied by weighing circuit, display circuit, warning circuit, keyboard circuit etc. and forms intelligent weighing system circuit board, so as to realize
Function of weighing, warning function, data computing function and the human-computer exchange function of automatic weighing system.
Further, it is broadly divided into five modules according to the requirement of design function of the present invention, present invention design：Data are adopted
Collect module, signal amplification module, analog-to-digital conversion module, single chip control module, human-machine exchange module.（Wherein human-computer exchange mould
Block includes：Sound and light alarm, LCD are shown, input through keyboard）System design overall plan block diagram is as shown in Figure 1.Measurement part is profit
Pressure signal is detected with weighing sensor, obtains faint electric signal（The present invention is designed as voltage signal）, and after through processing electricity
Road（Such as filter circuit, differential amplifier circuit,）After processing, A/D converter is sent, analog quantity is converted into digital output.Control
Device part receives the data signal from A/D converter output, by the computing of complexity, converts digital signals into the reality of object
Border weight signal, and be stored in memory cell.Controller can also be carried out by the control to expansion I/O to keyboard
Scanning, then dissipates carryover sequence by keyboard, whole system is controlled.Data display unit realizes display work(as needed
Energy.
Further, the present invention is designed due to requiring the master controller that single-chip microcomputer must be used as system, and with list
Piece machine is the design of master controller, easily can be combined together computer technology and survey control technology, and composition is new
Only need change " intelligent measurement control system " that software program can updates.This new intelligence instrument exists
The variation aspect of measurement process automation, the data processing of measurement result and function, all achieves huge progress.Moreover
Because system does not have the requirement of other high standards, according to the analysis of collectivity Scheme Design, such a simple system is designed,
The single-chip microcomputer with EPROM can be selected, because application program is little, application program is stored directly in piece, without expanding in outside
Memory is opened up, such circuit can also simplify.The 8051 of INTEL Corp. and 8751 all can be used, herein from ATMEL productions
AT89SXX series monolithics.AT89SXX series has two big advantages compared with MCS-51：First, on-chip memory is deposited using flash
Reservoir, make program write-in more convenient；Second, there is provided smaller size of chip, make whole hardware circuit volume smaller.In addition
MCPU cheap, performance comparision is stable, there are 8K × 8ROM, 256 × 8RAM, 3 16 bit timing counters, 48 I/
O Interface.These configurations can realize that the measurement of this instrument and control require well.
Further, in invention designs, sensor is a highly important element, therefore to the selection of sensor
Aobvious is special important, not only it is noted that its range and parameter, are also considered and the design of the various circuits of its phase configuration
Complexity and design cost performance etc..The selection of transducer range can the maximum capacity value according to scale, from sensor
The combined factors such as number, the conducting oneself with dignity of scale body, issuable maximum unbalance loading and dynamic load evaluations determines.In general, sensor
For range closer to the load for being assigned to each sensor, the degree of accuracy that it is weighed is higher.But in actual use, due to being added in
The load such as the deadweight of scale body, tare weight, unbalance loading and vibratory impulse also be present, therefore select in addition to weighed object in the load on sensor
During transducer range, all many factors are considered, ensure safety and the life-span of sensor.The calculation formula of transducer range
It is after each factor for influenceing scale body is fully taken into account, is determined by substantial amounts of test.To ensure that electronic scale weighs knot
The degree of accuracy of fruit, sensor is overcome the lower range section poor linearity the shortcomings that.In real work, it is desirable to which weighing sensor has
Range is imitated between 20%~80%, good linearity, precision height.Weight error should be controlled in ± 0.01Kg, it is also contemplated that weighing platform deadweight,
Vibration and impact component, will also avoid overweight damage sensor, so we determined that the rated load of sensor is 5Kg, it is allowed to
Overload for 150%F.S, precision 0.05%, error 0.01kg during maximum range.The required precision of the system can be met.It is comprehensive
Consider, the electronic scale to be realized of the design is absolute pressure value, while in order to simplify circuit, improves stability and anti-interference energy
Power, it is desirable to use the resistance strain type pressure sensor with temperature compensation capability.The design selects CZAF-602 pressure sensings
Device, its maximum range are 5 Kg.
Further, 0~2mV of weighing sensor output voltage amplitude range.And the input voltage requirement that A/D is changed is 0
~2V, therefore amplifying element will have 1000 times or so of gain.Requirement to amplifying element is adjustable gain（700~1500
Times）, 1000 times are set to according to the actual conditions gain of the design, the temperature drift and time drift pole of zero point and gain
It is small.According to input voltage 2mV, the situation that 20000 yards of resolution ratio, drift is less than 1 μ V.Because it has extremely low offset voltage
Temperature drift and when float（±1µV）, so as to ensure that requirement of the amplifying element to null offset.A remaining point drift relies on software
Automatic zero point tracking come thoroughly solve.Stable amount of gain can ensure the stability of its negative feedback loop, and preferably select
With the resistance and multiturn potentiometer of high value.
Further, present invention selection is amplified by signal of the differential amplifier that base amplifier is formed as the design
Circuit.
Further, present invention employs 12 A/D converter ADC0832.ADC0832 is that 8 bit resolution A/D change core
Piece, its highest are differentiated up to 256 grades, are adapted in general analog quantity conversion requirements.Its internal electric source inputs and reference voltage
Multiplexing so that the analog voltage of chip is inputted between 0 ~ 5V.Chip conversion time is only 32 μ S, can according to there is Double Data to export
As data check, to reduce data error, conversion speed is fast and stability is strong.The enabled input of independent chip, makes more devices
Part mounts and what processor control became more facilitates.By DI data input pins, the selection of channel function can be easily realized.
Further, the present invention uses matrix keyboard：The characteristics of matrix keyboard is that detection line is divided into two groups, one group
For line, one group of alignment, button is placed on the crosspoint of line and alignment.Fig. 2 gives the matrix keyboard structure of one 4 × 4
Keyboard interface circuit, each button in figure is connected this by different line and alignment with main frame.4 × 4 matrix forms
Keyboard can install 16 keys altogether, but only need 8 p-wires.When the quantity of keyboard is more than 8, matrix form key is typically all used
Disk.With reference to the actual requirement of the design, using 4 × 4 matrix keyboards.
Further, data show be electronic scale a critical function, be human-computer exchange chief component, it can
Intuitively shown after microprocessor processes with the data for measuring measuring circuit.Data display unit can have following
Two schemes are selective.The composition of display has following two schemes available：First, LED charactrons are shown, second, LCD liquid crystal
Two kinds of selections of display.LCD liquid crystal displays are a kind of extremely low power dissipation displays, from electronic watch to calculator, from it is pocket when instrument
Liquid crystal display is all make use of extensively to portable microcomputer and some word processors.The present invention design using
HJ12864ZW liquid crystal displays.Its pictorial diagram is as shown in Figure 3.
Further, intelligence instrument typically all has warning function, and alarm is mainly used in system operation error, when measurement
Data are set when exceeding instrument range either more than the bound of user's setting for prompting user.In the present system, set
The purpose of alarm is exactly when can not normally be shown beyond electronic scale measurement range and total price, sends sound and light alarm signal, carries
Show user, prevent from damaging instrument.
Further, overload alarm circuit is controlled by the I/O mouths of single-chip microcomputer, when weighting objects weight exceedes system
The allowed weight of design, makes the I/O values of single-chip microcomputer be low level by program, so as to triode ON, makes buzzer
SPEAKER sends alarm, while the I/O of connection alarm lamp is set to low level, then LEDs ON, diode hair
Light.The polarity of light emitting diode must be paid attention in the design process, and otherwise, Light-Emitting Diode is will not normal luminous.
The preferred embodiment of patent of the present invention is the foregoing is only, is not intended to limit the invention patent, it is all at this
All any modification, equivalent and improvement made within the spirit and principle of patent of invention etc., should be included in patent of the present invention
Protection domain within.
Claims (3)
- A kind of 1. SCM Based electronic scale, it is characterised in that patent of the present invention is related to a kind of SCM Based electronic scale, For the present invention using AT89S52 single-chip microcomputers as main control chip, periphery is accompanied by weighing circuit, display circuit, warning circuit, keyboard circuit etc. Form intelligent weighing system circuit board, so as to realize the function of weighing of automatic weighing system, warning function, data computing function with And human-computer exchange function.
- 2. a kind of SCM Based electronic scale according to claim 1, it is characterised in that present invention design can substantially divide For five modules：Data acquisition module, signal amplification module, analog-to-digital conversion module, single chip control module, human-computer exchange mould Block.
- 3. a kind of SCM Based electronic scale according to claim 1, it is characterised in that the present invention selects CZAF-602 Pressure sensor, its maximum range are 5 Kg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610562546.5A CN107631787A (en) | 2016-07-18 | 2016-07-18 | A kind of SCM Based electronic scale |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610562546.5A CN107631787A (en) | 2016-07-18 | 2016-07-18 | A kind of SCM Based electronic scale |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107631787A true CN107631787A (en) | 2018-01-26 |
Family
ID=61112797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610562546.5A Pending CN107631787A (en) | 2016-07-18 | 2016-07-18 | A kind of SCM Based electronic scale |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107631787A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202304982U (en) * | 2011-10-12 | 2012-07-04 | 长安大学 | Electronic balance |
| CN202433069U (en) * | 2011-12-26 | 2012-09-12 | 广东够快物流信息科技有限公司 | Electronic scale |
| CN202485766U (en) * | 2011-12-20 | 2012-10-10 | 福建新大陆电脑股份有限公司 | Electronic scale |
| CN102798454A (en) * | 2012-08-14 | 2012-11-28 | 昆山大百科实验室设备工程有限公司 | Miniature electronic balance |
| CN203100841U (en) * | 2012-12-06 | 2013-07-31 | 长安大学 | Electronic weighing apparatus |
-
2016
- 2016-07-18 CN CN201610562546.5A patent/CN107631787A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202304982U (en) * | 2011-10-12 | 2012-07-04 | 长安大学 | Electronic balance |
| CN202485766U (en) * | 2011-12-20 | 2012-10-10 | 福建新大陆电脑股份有限公司 | Electronic scale |
| CN202433069U (en) * | 2011-12-26 | 2012-09-12 | 广东够快物流信息科技有限公司 | Electronic scale |
| CN102798454A (en) * | 2012-08-14 | 2012-11-28 | 昆山大百科实验室设备工程有限公司 | Miniature electronic balance |
| CN203100841U (en) * | 2012-12-06 | 2013-07-31 | 长安大学 | Electronic weighing apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205664912U (en) | Digit electronic scale based on strain bridge sensor | |
| CN105928600A (en) | Weight measurement method and device | |
| CN203100841U (en) | Electronic weighing apparatus | |
| CN105092007A (en) | Weight measuring instrument | |
| CN208968648U (en) | A kind of high-precision electronic claims | |
| CN202903312U (en) | Weighing device with wireless transmission function | |
| CN101187677A (en) | Multifunctional electrical parameter measuring instrument | |
| CN105973445A (en) | Intelligent electronic scale system based on cloud service | |
| CN203719620U (en) | Portable low-power static state resistance strain gauge | |
| CN201215505Y (en) | Digital weighing controller | |
| CN203148559U (en) | Novel intelligent weighing system | |
| CN107631787A (en) | A kind of SCM Based electronic scale | |
| CN104359533A (en) | Mini jewelry electronic scale | |
| CN104655255A (en) | Electronic scale capable of carrying out network communication | |
| CN213515963U (en) | Intelligent precision electronic balance | |
| CN205262596U (en) | Exempt from electronic scale of calibration technology function behind height above sea level altitude variation | |
| CN206804131U (en) | A kind of small weighbridge instrument of New-type mould revolution | |
| CN102261946A (en) | Weight sampler and electronic product capable of weighing | |
| CN205506182U (en) | That uses in tobacco flue -curing is weighed carries out data transmission's electronic platform scale based on bluetooth protocol | |
| CN206804120U (en) | A kind of accurate electronic scale device of intelligent portable | |
| CN106092281A (en) | A kind of intelligent electronic-scale system | |
| CN206134060U (en) | Sensor signal detects transition experiment case and sensor holds case | |
| CN203011610U (en) | Novel digital altimeter based on AVR one-chip microcomputer | |
| CN203672371U (en) | Quartz flexure accelerometer based dipmeter | |
| CN104359535A (en) | Portable electronic scale |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180126 |
|
| WD01 | Invention patent application deemed withdrawn after publication |