CN106228876A - A kind of high-precision pressure sensor experimental model and experimental technique thereof - Google Patents
A kind of high-precision pressure sensor experimental model and experimental technique thereof Download PDFInfo
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- CN106228876A CN106228876A CN201610914487.3A CN201610914487A CN106228876A CN 106228876 A CN106228876 A CN 106228876A CN 201610914487 A CN201610914487 A CN 201610914487A CN 106228876 A CN106228876 A CN 106228876A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
- G09B23/187—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for measuring instruments
Abstract
One high-precision pressure sensor experimental model of the present invention and experimental technique thereof relate to automatically detecting and field of sensing technologies, change more specifically to foil gauge pressure measxurement and high accuracy and display field, be a kind of sensor experiment model being easy to user disassembled and assembled freely and innovative design.Including base, support, cantilever beam and pan of a steelyard, support is arranged on the middle part of base, cantilever beam is arranged on cantilever tip, one end of cantilever beam is bolted on support formation cantilever beam structure, it is provided with suppending hole at the edge of the scale pan, through suppending hole, the scale pan is suspended on the other end of cantilever beam by thin cord, is provided with foil gauge on a cantilever beam；High-precision pressure sensor experimental model is additionally provided with independent detecting system, described detecting system includes shell and testing circuit plate, and testing circuit plate is provided with signal processing circuit, key circuit, single-chip microcomputer mini system circuit, display circuit, overload alarm circuit, serial communication circuit and power circuit.
Description
Technical field
One high-precision pressure sensor experimental model of the present invention and experimental technique thereof relate to automatically detecting and sensing technology
Field, changes more specifically to foil gauge pressure measxurement and high accuracy and display field, is that one is easy to user freely
Dismounting and the sensor experiment model of innovative design.
Background technology
In today that technology develops rapidly, in a complete automatic checkout system, sensor is requisite, and presses
Power detection is again an importance of automatic detection field.A lot of for the sensor of pressure detecting, strain-gauge transducer
It it is exactly typical case's force cell therein.
Will lecture in the course teaching of the specialty such as undergraduate course and Vocational colleges automation class, electronic information class at present should
Become the knowledge of sheet pressure detecting, and the experimental apparatus being supplied to colleges and universities on market is essentially all same scheme: foil gauge passes
Sensor module is fixed in laboratory table, and sensor measuring circuit template is also ready for, and it is complete that user has only to corresponding good interface
Become wiring, it is possible to carry out pressure measxurement.
The shortcoming of this scheme is:
1. commercial style weighing and force-measuring transducer selected by sensor, and wherein cantilever beam is standard type elastomeric material, and foil gauge is the most
Pasting on a cantilever beam, student cannot understand the force-sensitive property of different elastomeric material, also cannot go to attempt pasting voluntarily strain
Sheet.
2. measuring circuit template is ready for changing, and the circuit of selection is analog circuit, and circuit design is the most outmoded,
Certainty of measurement is low, is unfavorable for that student understands the advanced design method of current pressure sensor circuit.
Although 3. supporting numeric display unit in laboratory table, but only show the magnitude of voltage that measuring circuit exports, often
Magnitude of voltage is the most corresponding with force value (weight of object), and accuracy is poor.
The most whole sensor detecting system device and circuit are all fixing, it is impossible to provide change space, user without
Method carries out innovative design on the basis of original system.
Summary of the invention
It is an object of the invention to provide a kind of high-precision pressure sensor experimental model and in fact for above-mentioned weak point
Proved recipe method, this experimental model is a kind of easy-to-mount experimental model, and this model is combined by multiple standalone modules, builds one
The pressure transducer detecting system of individual advanced person, can realize high-acruracy survey in the range of 0 ~ 500g, and error is less than 0.3g.
The present invention takes techniques below scheme to realize:
High-precision pressure sensor experimental model includes base, support, cantilever beam and pan of a steelyard, and support is arranged on the middle part of base,
Cantilever beam is arranged on cantilever tip, and one end of cantilever beam is bolted on support formation cantilever beam structure, at the scale pan
Edge is provided with suppending hole, through suppending hole, the scale pan is suspended on the other end of cantilever beam by thin cord, is provided with on a cantilever beam
Foil gauge；
Described foil gauge uses commercially available resistance strain gage pressure transducer, and foil gauge is provided with four, four foil gauge head and the tail phases
Even composition full-bridge circuit, when placing object on the scale pan, the action of gravity of object makes elastic cantilever generation mechanically deform, cantilever beam
On foil gauge deform the most therewith, the deformation of foil gauge cause it resistance occur regular linear change, by foil gauge group
The full-bridge circuit become is converted into the change of foil gauge resistance the change of voltage；
High-precision pressure sensor experimental model is additionally provided with independent detecting system, for pressure measxurement and display etc.；
Described detecting system includes shell and testing circuit plate, and testing circuit plate is arranged in shell, is provided with power supply on shell
Switch, reset key, power supply indicator and display window, serial line interface is left in shell side；
Testing circuit plate is provided with signal processing circuit, key circuit, single-chip microcomputer mini system circuit, display circuit, overload alarm
Circuit, serial communication circuit and power circuit；
Described signal processing circuit, single-chip microcomputer mini system circuit and display circuit are sequentially connected；Key circuit and the little system of single-chip microcomputer
System circuit is connected；Single-chip microcomputer mini system circuit outbound course respectively with display circuit, overload alarm circuit and serial communication
Circuit is connected；Power circuit provides running voltage, on and off switch to be connected with power circuit with power supply indicator for detecting system, electricity
Source switch is for controlling the break-make of power supply, and power supply indicator is for showing the duty of power circuit；
Described signal processing circuit uses at A/D converter (A/D transducer), the outfan of described full-bridge circuit and signal
Reason circuit is connected, and voltage change sends to signal processing circuit, then will be amplified and after analog/digital conversion by signal processing circuit
Digital signal send single-chip microcomputer mini system circuit to, single-chip microcomputer mini system circuit is by information transmission such as the weight of object and prices
Show to display circuit, and by serial communication, the information such as the weight of described object and price are sent to host computer；Work as object
When weight is beyond measurement scope, triggering signal is sent to overload alarm circuit, overload alarm circuit by single-chip microcomputer mini system circuit
Carry out overload alarm.
Single-chip microcomputer mini system circuit uses single-chip microcomputer as core.
Described strain gauge adhesion is on a cantilever beam.
All 8 output pins are had with two thin copper wires as its output pin, four foil gauges on each foil gauge,
After being welded with pin by wire, output pin extended and be fixed on circuit board, on circuit boards defeated four foil gauges
Going out pin and connect into full-bridge circuit, the output pin of full-bridge circuit is connected with the input interface of signal processing circuit；Described full-bridge
Circuit sensitivity is high, and nonlinearity erron is little, and the pressure that the weight on the scale pan causes, through foil gauge full-bridge circuit, is converted into small
Voltage signal output.
Described A/D converter uses commercially available HX711 chip.
Described key circuit uses 4 × 4 matrix keyboard structures, in order to ensure the stablizing, at circuit of logic level in circuit
In with the addition of 4 pull-up resistors；Button on keyboard arranges 16 altogether, including 10 digital keys and 6 function keys, is used for setting
Put unit price, remove the peel, report to the police and the function such as serial communication；Button is arranged on shell with the pattern of matrix keyboard.
Described single-chip microcomputer mini system circuit includes single-chip microcomputer, reset circuit and clock circuit, and single-chip microcomputer is electric with reset respectively
Road is connected with clock circuit；Clock circuit provides accurate operating frequency to single-chip microcomputer；Reset circuit has reset key, resets
Circuit has electrification reset and two kinds of mode of operations of hand-reset, automatically makes monolithic processor resetting after detecting system start energising, single
Sheet machine work process can also make monolithic processor resetting by reset key；After single-chip microcomputer mini system circuit is to analog/digital conversion
Digital Signal Analysis processes, and draws the weight of accurate object.
Described display circuit uses LCDs, concatenates the contrast of potentiometer regulation display screen in LCDs
Degree.
Described overload alarm circuit includes PNP type triode, buzzer and LED, when weight of object is beyond measurement scope
Time (such as 500g), Micro Controller Unit (MCU) driving overload alarm circuit works, and buzzer is clamored and cried, simultaneously LED flicker.
Described cantilever beam uses strip metal material to make, and cantilever beam can freely be changed, and high-precision pressure sensor is real
The cantilever beam testing model is provided with 10, a length of 200-300mm.
The experimental technique of high-precision pressure sensor experimental model, comprises the steps:
1) cantilever beam is chosen according to experiment demand；
2) foil gauge symmetry equal for four resistances being pasted on a cantilever beam, cantilever beam upper and lower surface respectively pastes two panels；
3) step 2) in paste cantilever beam one end of foil gauge and be fixed by bolts to cradle top, the other end hangs up the scale pan,
The pin of foil gauge is connected on circuit board form full-bridge circuit after wire extends；
4) successively single-chip microcomputer mini system circuit and full-bridge circuit, signal processing circuit, key circuit, display circuit, transfinite report
Alert circuit, serial communication circuit couple together, and complete the connection of detecting system；
5) it is energized to sensor experiment model, observes power supply indicator the most working properly, the download program write to single
In sheet machine, download program is complete, and display screen display weight of object is 0g；
6) experiment of weighing is started: on the scale pan, put the counterweight of standard weights successively, record the survey of display screen display simultaneously
Amount result, analyzes experimental result, computation and measurement error；
7) valuation functions experiment: first put counterweight on the scale pan, record the weight of the object of systematic survey, then pass through button
Arranging object unit price, after pressing acknowledgement key confirmation, record the object total price of system-computed, after pressing preservation function key, system is protected
Deposit data；Reappose new counterweight again, unit price be set, observed and recorded weight of object and total price, analyze judge currently displaying
Whether object total price is all total prices being weighed object；
8) peeling functional experiment: place the object less than 100g weight on the scale pan, presses peeling function key and carries out peeling operation,
The weight of record display screen display, and measurement result is compared with 0g, analyze measurement error；
9) overload alarm functional experiment: place on the scale pan more than the object of 500g weight, in overview alarm circuit buzzer and
LED working condition, is named if buzzer is clamored, and LED flashes, and warning function is normal；
10) serial communication experiment: above-mentioned steps 6) ~ 9) experiment complete after, by transmitting function key current experiment data pass
Give host computer.
Described host computer is PC.
Experimental model of the present invention both can allow user learn to the design of pressure transducer detecting system and build, and again may be used
With auxiliary user, system is carried out innovative design or transformation.Experimental model itself is easily decomposes and dismounts, and user can root
Need to change accessory and circuit module according to the design of oneself, again build a pressure transducer measurement apparatus, and actual test
Demonstrate,proving its design the most correct, whether precision reaches requirement.Concrete advantage is as follows:
1, the experimental model of the present invention is all prone to dismounting from frame for movement to Circuits System, it is provided that the biggest change space, suitable
Share in student experimenting, applicable user carries out innovative design.
2, the experimental model of the present invention provides the technical scheme that a set of high-precision pressure is measured, and solves traditional experiment platform
Measuring inaccurate problem, except pressure measxurement, experimental model can also realize more additional function, helps user to remove decompression
The advanced design method of force transducer and more tonometric knowledge.
3, the experimental model low cost of the present invention, commercial style pressure transducer price is higher in the market, and the present invention
The cantilever beam of middle employing is common metal bar, and cost is the lowest, and the stickup of foil gauge is operated by user oneself, the most both makes
User is taken exercise, and also reduces cost.
Accompanying drawing explanation
Below with reference to accompanying drawing, the invention will be further described:
Fig. 1 is the structural representation of high-precision pressure sensor experimental model of the present invention；
Fig. 2 is the composition frame chart of detecting system in high-precision pressure sensor experimental model of the present invention；
Fig. 3 is the foil gauge catenation principle figure of high-precision pressure sensor experimental model of the present invention；
Fig. 4 is the circuit connection diagram of the signal processing circuit of the embodiment of the present invention；
Fig. 5 is the circuit connection diagram of the key circuit of the embodiment of the present invention；
Fig. 6 is the key arrangement schematic diagram of the embodiment of the present invention；
Fig. 7 is the circuit connection diagram of the single-chip microcomputer mini system circuit of the embodiment of the present invention；
Fig. 8 is the circuit connection diagram of the display circuit of the embodiment of the present invention.
Wherein: 1, base, 2, support, 3, bolt, 4, cantilever beam, 5, foil gauge, 6, the scale pan, 7, detection system circuit board
(band shell).
Detailed description of the invention
Referring to the drawings 1 ~ 8, high-precision pressure sensor experimental model of the present invention includes base, support, cantilever beam and pan of a steelyard,
Support is arranged on the middle part of base, and cantilever beam is arranged on cantilever tip, and one end of cantilever beam is bolted on shape on support
Become cantilever beam structure, be provided with suppending hole at the edge of the scale pan, through suppending hole, the scale pan is suspended on cantilever beam by thin cord
The other end, is provided with foil gauge on a cantilever beam；High-precision pressure sensor experimental model is additionally provided with independent detecting system, is used for
Pressure measxurement and display；Strain-ga(u)ge transducer is connected with detecting system, sends pressure change signal to detecting system, by detecting
Signal is analyzed processing and showing or report to the police by system.
Described foil gauge uses commercially available resistance strain gage pressure transducer, and foil gauge is provided with four, four foil gauge head
Tail is connected to form full-bridge circuit, and when placing object on the scale pan, the action of gravity of object makes elastic cantilever generation mechanically deform, outstanding
Foil gauge on arm beam deforms the most therewith, and the deformation of foil gauge causes its resistance regular linear change to occur, by straining
The full-bridge circuit of sheet composition is converted into the change of foil gauge resistance the change of voltage；The output voltage of full-bridge circuit is less, logical
Crossing a, b, c, d pin accesses signal processing circuit (such as Fig. 3).
High-precision pressure sensor experimental model is additionally provided with independent detecting system, for pressure measxurement and display etc.；
Described detecting system includes shell and testing circuit plate, and testing circuit plate is arranged in shell, is provided with power supply on shell
Switch, reset key, power supply indicator and display window, serial line interface is left in shell side；
Testing circuit plate is provided with signal processing circuit, key circuit, single-chip microcomputer mini system circuit, display circuit, overload alarm
Circuit, serial communication circuit and power circuit；
Described signal processing circuit, single-chip microcomputer mini system circuit and display circuit are sequentially connected；Key circuit and the little system of single-chip microcomputer
System circuit is connected；Single-chip microcomputer mini system circuit outbound course respectively with display circuit, overload alarm circuit and serial communication
Circuit is connected；Power circuit provides running voltage, on and off switch to be connected with power circuit with power supply indicator for detecting system, electricity
Source switch is for controlling the break-make of power supply, and power supply indicator is for showing the duty of power circuit；
Described signal processing circuit uses A/D converter, and the outfan of described full-bridge circuit is connected with signal processing circuit,
Voltage change is sent to signal processing circuit, then will be amplified by signal processing circuit and carry out the numeral after analog/digital conversion
Signal sends single-chip microcomputer mini system circuit to, and single-chip microcomputer mini system circuit sends the information such as the weight of object and price to display
Circuit shows, and by serial communication, the information such as the weight of described object and price is sent to host computer；When weight of object surpasses
When going out to measure scope, triggering signal is sent to overload alarm circuit by single-chip microcomputer mini system circuit, and overload alarm circuit surpasses
Limit is reported to the police.
Single-chip microcomputer mini system circuit uses single-chip microcomputer as core.
Described strain gauge adhesion is on a cantilever beam.
Described cantilever beam uses strip metal material to make, and described metal material includes common iron plate, steel plate, aluminum
Plate, copper coin, zine plate etc., sheet metal thickness about 3mm, it is about 200-300mm through being mechanically cut into, the strip material of wide about 15mm
Material, uses as cantilever beam；Cantilever beam is drawn materials easily, and cost is the lowest, supporting 5 kinds of materials, 10 gold in this experimental model
Belong to cantilever beam, select for user.
Single-chip microcomputer mini system circuit is as the control core of detecting system, and it is by single-chip microcomputer and reset circuit, clock circuit
Collectively constituting, its working method is software and hardware combining, on the one hand, strain-ga(u)ge transducer and signal processing circuit are the pressure of change
Power is converted into significant digits signal and inputs to single-chip microcomputer, and on the other hand, user passes through to input corresponding key assignments on key circuit,
Just can send work order to single-chip microcomputer, after single-chip microcomputer receives instruction, therein under the assistance of program, real-time reception be arrived
Digital signal be analyzed process, calculate weight of object accurately, simultaneously Single-chip Controlling LCD display circuit, show in real time
Showing the gravimetric value of object, if gravimetric value transfinites (such as upper weight limit is set to 500g), single-chip microcomputer just drives warning circuit to enter
Row sound and light alarm.
As shown in Figure 7 in embodiment, described single-chip microcomputer uses the MSP430F149 single-chip microcomputer that cost performance is higher, and it is 16
Super low-power consumption processor, fast response time, and have abundant peripheral module, facilitate writing of program, its house dog electricity
Road greatly reduces the error rate of program, and more I/O mouth can extend more function, and MSP430 single-chip microcomputer both facilitated
Writing of program, also simplify the design of hardware circuit；The clock circuit crystal oscillator by a 8MHz and the capacitance group of two panels 30pF
Becoming, it provides accurate operating frequency to single-chip microcomputer；Reset circuit is by a 10k resistance, 0.1u electric capacity, a diode
4148 and a reset key formed by connection in series-parallel, described reset key is arranged in reset circuit of SCM, reset circuit
There are electrification reset and two kinds of mode of operations of hand-reset, after detecting system start energising, automatically make monolithic processor resetting, single-chip microcomputer
Work process can also make monolithic processor resetting by reset key；Single-chip microcomputer mini system circuit is to the numeral after analog/digital conversion
Signal analysis and processing, draws accurate result (weight of object), and single-chip microcomputer mini system circuit is by the weight of object and price etc.
Information sends display circuit to and shows, and is sent to upper by serial communication by information such as the weight of described object and price
Machine；When mass of object is beyond measurement scope, triggering signal is sent to overload alarm circuit, transfinites by single-chip microcomputer mini system circuit
Warning circuit carries out overload alarm.
Selected single-chip microcomputer has 64 pins, and response is fast, low in energy consumption, and its 52, No. 53 pins connect outer clock circuit,
Outer clock circuit is made up of the crystal oscillator of 8MHz and the electric capacity of two panels 30pF, and clock circuit provides, to single-chip microcomputer, the frequency that works accurately
Rate；Its No. 58 pins connect reset circuit, and reset circuit comprises electrification reset and hand-reset both of which, it is achieved single-chip microcomputer
Reset function.P3.2 and the P3.3 foot of single-chip microcomputer is connected with signal processing circuit, receives the digital signal after analog/digital conversion,
8 pins of its P1 mouth are connected with key circuit, form 4 × 4 matrix keyboards, have 16 function buttons, by button electricity
Road both can arrange the upper limit value and lower limit value of object unit price and weight of object, it is also possible to single-chip microcomputer is sent instruction.The P2 mouth of single-chip microcomputer
Being connected with LCD display circuit with P6.3 ~ P6.6 totally 12 pins, its P3.4 foot is connected with overload alarm circuit.Selected monolithic
Machine is also had more than needed some functional pins, in case using during functions expanding.
As shown in Figure 4 in embodiment, A/D converter uses commercially available HX711 chip, and HX711 chip is special high-precision
Degree A/D converter, it is the core devices of signal processing circuit, and it has been internally integrated regulated power supply, on-chip clock oscillator
Deng peripheral circuit, having signal concurrently and amplify and the function of 24 analog/digital conversions, signal gain is maximum up to 128, have precision high,
The advantages such as response is fast, strong interference immunity；Owing to integrated level is higher, the periphery of HX711 chip have only to a PNP type triode and
A small amount of electric capacity, resistive element just can normally work；The analogue signal exported by foil gauge full-bridge circuit is through signal processing
The input interface JC8 of circuit gives the A channel (7,8 pin) of HX711 chip, the signal processing circuit analogue signal to receiving
Being amplified, the multiple of amplification is 128, then the signal after amplifying is carried out 24 analog/digital conversions, the serial digital after conversion
Signal is exported to the single-chip microcomputer of single-chip microcomputer mini system circuit, signal by the standard interface JC9 being arranged in signal processing circuit
11,12 pins of standard interface JC9 and the HX711 chip processing circuit are connected.The signal processing circuit of the present embodiment connects
In figure, including HX711 chip and other peripheral components, 2 foot BASE of HX711 chip are that mu balanced circuit controls output pin, it
Being connected with the base stage of PNP triode 8550, transistor emitter connects 5V power supply, the colelctor electrode of audion and the 3 of HX711 chip
Foot AVDD connects, and the 5 foot AGND through electric capacity C7 and HX711 chip are connected simultaneously, then through electric capacity C8 and HX711 chip
6 foot VBG connect, and are linked together by resistance R12 between the 3 foot AVDD and 4 foot VFB of HX711 chip, 4 foot VFB and 5 feet
Linked together by resistance R13 between AGND.Because being integrated with regulated power supply in HX711 chip, so being connected by above
Implementation, it is possible to allow the regulated power supply of chip internal direct out the analog in portion's strain-ga(u)ge transducer circuit and chip
Transducer provides running voltage.In circuit, the most corresponding foil gauge full-bridge circuit of the 1 of input interface JC8,2,3,4 pins is defeated
Going out and hold a, b, c, d to connect, 1 foot of interface JC8 is also connected with the 3 foot AVDD of HX711,2 foot ground connection, and 3,4 pins pass through electric capacity C4
It is connected with 7 foot INA-, the 8 foot INA+ of resistance R8 with HX711, thus the analogue signal of foil gauge full-bridge circuit output is given
Analog channel A of HX711, the maximum gain of passage A is 128.The 14 foot X1 and 15 foot RATE of HX711 are shorted to ground, i.e.
14 feet and 15 feet all connect low level, select the clock oscillator in chip, and the output of chip when representing HX711 work
Data rate is 10Hz.The digital signal that signal processing circuit finally exports is 11 by HX711 and 12 feet transmit,
Wherein 11 foot PD_SCK are as serial ports clock input pin, receive the clock signal that single-chip microcomputer sends over；12 foot DOUT conducts
Serial data output pin, the timeticks Serial output that the digital signal needing output is sended over according to single-chip microcomputer is to monolithic
Machine, 11 and 12 feet respectively with standard interface JC9 2,3 feet connect.
Fig. 5 show the key circuit connection figure of the embodiment of the present invention, and key circuit is defeated with single-chip microcomputer mini system circuit
Entering end to be connected, key circuit includes that button and resistance, described button include digital keys and function key, is used for arranging unit price, going
The functions such as skin, warning and serial communication；Button is arranged on shell with the pattern of matrix keyboard.Key-press module arrange altogether 16 by
Key, including 10 numeral keys and 6 function keys, with the addition of key circuit (with reference to the key arrangement schematic diagram of Fig. 6), experimental model
The function that just can claim with simulation electronic, including arranging unit price, calculating total value, peeling, arranges warning, serial communication etc., makes pressure
The function of force transducer experimental model is more comprehensive；
After experimental model has been built, user can carry out confirmatory experiment function by button, first presses " Q " key, and system is just entered
Row " peeling " operation, LCD display shows weight is 0g, next places object on the scale pan, display screen can show in real time
Show the weight of current object, object unit price (unit: unit/gram) is set now by " 0 ~ 9 " and ". " key, after setting up unit price
Pressing " # " key, setting completed to show unit price, and display screen will demonstrate current object unit price at the second row, system basis simultaneously
Unit price and weight calculate the total price of object and show in real time at the third line.The folded of multiple object total price also supported by experimental model
Add, on the scale pan, such as to reappose an object, at this moment need first to press " J " key, system can preserve before data, then
Weighing new object and calculate, finally the third line at display screen demonstrates the most all total prices being weighed object
Lattice, additionally press " C " key, can when unit price input error to input value delete, press " T " key begin to serial ports lead to
Letter.
Fig. 8 is the circuit connection diagram of the display circuit of the embodiment of the present invention, and described LCDs uses LCD12864 liquid
Crystal display screen, LCD12864 liquid crystal display screen cost is relatively low, it is adaptable to the display of small-sized measurement system；No. 3 pins at LCD12864
The potentiometer of VO one 10k of connection is used for regulating the contrast of display screen, and these 8 pins of the DB0 ~ DB7 of LCD12864 are displays
8 position datawires of device, are connected with the P2 mouth of single-chip microcomputer, and these 4 feet of RS, WR, EN, CS1 of LCD12864 are to control pin, with
P6.3 ~ the P6.6 of single-chip microcomputer connects, and for the ease of observing, display screen is arranged on the display window on shell, at display screen
Upper main weight (unit g), unit price, total price and the amount of money showing object.
When high-precision pressure sensor experimental model is tested, applicable material and length can be chosen according to experiment demand
The cantilever beam of degree；Tested as follows by model:
1, carry out experiment of weighing, the scale pan is put the counterweight of standard weights successively, records the survey of display screen display simultaneously
Amount result, analyzes experimental result, computation and measurement error；
2, valuation functions experiment, first puts counterweight on the scale pan, records the weight of the object of systematic survey, then pass through button
Arranging object unit price, after pressing the confirmation of " # " key, record the object total price of system-computed, after pressing " J " key, system preserves number
According to, then reappose new counterweight, unit price is set, observed and recorded weight of object and total price, analyze and judge currently displaying object
Whether total price is all total prices being weighed object；
3, peeling functional experiment: place the object (peeling scope 0 ~ 100g) less than 100g weight on the scale pan, press " Q " key and enter
Row " peeling " operation, whether the weight observing display screen display is 0g；
4, overload alarm functional experiment: place on the scale pan more than the object of 500g weight, in overview alarm circuit buzzer and
LED working condition, is named if buzzer is clamored, and LED flashes, and warning function is normal；
After above-mentioned experiment completes, press " T " key, current experiment data are sent to host computer.
The present invention, from frame for movement to Circuits System, uses low cost, easy-to-dismount structure or module, pressure transducer
The signal gathered is through module synthesis analyzing and processing such as single-chip microcomputers, it is achieved high-precision pressure is measured and more additional function, logical
Cross standard interface to connect, so each element circuit can be changed, it is provided that the space of the biggest innovative design.
Claims (10)
1. a high-precision pressure sensor experimental model, it is characterised in that: include base, support, cantilever beam and pan of a steelyard, support
Being arranged on the middle part of base, cantilever beam is arranged on cantilever tip, and it is outstanding that one end of cantilever beam is bolted on support formation
Arm girder construction, is provided with suppending hole at the edge of the scale pan, through suppending hole, the scale pan is suspended on another of cantilever beam by thin cord
End, is provided with foil gauge on a cantilever beam；
Described foil gauge uses resistance strain gage pressure transducer, and foil gauge is provided with four, and four foil gauges join end to end composition
Full-bridge circuit, when placing object on the scale pan, the action of gravity of object makes elastic cantilever generation mechanically deform, answering on cantilever beam
Become sheet deform the most therewith, the deformation of foil gauge cause it resistance occur regular linear change, by foil gauge form complete
Bridge circuit is converted into the change of voltage the change of foil gauge resistance；
High-precision pressure sensor experimental model is additionally provided with independent detecting system, for pressure measxurement and display；
Described detecting system includes shell and testing circuit plate, and testing circuit plate is arranged in shell, is provided with power supply on shell
Switch, reset key, power supply indicator and display window, serial line interface is left in shell side；
Testing circuit plate is provided with signal processing circuit, key circuit, single-chip microcomputer mini system circuit, display circuit, overload alarm
Circuit, serial communication circuit and power circuit；
Described signal processing circuit, single-chip microcomputer mini system circuit and display circuit are sequentially connected；Key circuit and the little system of single-chip microcomputer
System circuit is connected；Single-chip microcomputer mini system circuit outbound course respectively with display circuit, overload alarm circuit and serial communication
Circuit is connected；Power circuit provides running voltage, on and off switch to be connected with power circuit with power supply indicator for detecting system, electricity
Source switch is for controlling the break-make of power supply, and power supply indicator is for showing the duty of power circuit；
Described signal processing circuit uses A/D converter, and the outfan of described full-bridge circuit is connected with signal processing circuit, will
Voltage change sends signal processing circuit, then the digital signal biography will amplified and after analog/digital conversion by signal processing circuit to
Giving single-chip microcomputer mini system circuit, weight and the pricing information of object are sent to display circuit and show by single-chip microcomputer mini system circuit
Show, and by serial communication, weight and the pricing information of described object are sent to host computer；When mass of object is beyond measuring model
When enclosing, triggering signal is sent to overload alarm circuit by single-chip microcomputer mini system circuit, and overload alarm circuit carries out overload alarm.
High-precision pressure sensor experimental model the most according to claim 1, it is characterised in that: described strain gauge adhesion exists
On cantilever beam.
High-precision pressure sensor experimental model the most according to claim 1, it is characterised in that: the most attached on described foil gauge
Two thin copper wires are had to have 8 output pins, by defeated after being welded with pin by wire as its output pin, four foil gauges
Go out pin extend and be fixed on circuit board, on circuit boards the output pin of four foil gauges is connected into full-bridge circuit, entirely
The output pin of bridge circuit is connected with the input interface of signal processing circuit.
High-precision pressure sensor experimental model the most according to claim 1, it is characterised in that: described A/D converter
Use HX711 chip.
High-precision pressure sensor experimental model the most according to claim 1, it is characterised in that: described key circuit uses
4 × 4 matrix keyboard structures, in order to ensure the stablizing of logic level in circuit, with the addition of 4 pull-up resistors in circuit；Keyboard
On button arrange 16 altogether, including 10 digital keys and 6 function keys, be used for arranging unit price, remove the peel, report to the police and serial ports leads to
Telecommunication function；Button is arranged on shell with the pattern of matrix keyboard.
High-precision pressure sensor experimental model the most according to claim 1, it is characterised in that: described overload alarm circuit
Including buzzer and LED, when weight of object is beyond measurement scope, overload alarm circuit works, and buzzer is clamored and cried, simultaneously
LED flashes.
High-precision pressure sensor experimental model the most according to claim 1, it is characterised in that: described single-chip microcomputer mini system
Circuit includes single-chip microcomputer, reset circuit and clock circuit, and single-chip microcomputer is connected with reset circuit and clock circuit respectively；Reset circuit
Having reset key, reset circuit has electrification reset and two kinds of mode of operations of hand-reset, after detecting system start energising certainly
Move and make monolithic processor resetting, single-chip microcomputer work process makes monolithic processor resetting by reset key；Single-chip microcomputer mini system circuit to mould/
Digital Signal Analysis after number conversion processes, and draws the weight of object.
High-precision pressure sensor experimental model the most according to claim 1, it is characterised in that: described display circuit uses
LCDs, concatenates the contrast of potentiometer regulation display screen in LCDs.
High-precision pressure sensor experimental model the most according to claim 1, it is characterised in that: described cantilever beam uses long
Sheet metal material, cantilever beam can freely be changed.
10. the experimental technique of the high-precision pressure sensor experimental model described in claim 1, it is characterised in that include as follows
Step:
1) cantilever beam is chosen according to experiment demand；
2) foil gauge symmetry equal for four resistances being pasted on a cantilever beam, cantilever beam upper and lower surface respectively pastes two panels；
3) step 2) in paste cantilever beam one end of foil gauge and be fixed by bolts to cradle top, the other end hangs up the scale pan,
The pin of foil gauge is connected on circuit board form full-bridge circuit after wire extends；
4) successively single-chip microcomputer mini system circuit and full-bridge circuit, signal processing circuit, key circuit, display circuit, transfinite report
Alert circuit, serial communication circuit couple together, and complete the connection of detecting system；
5) it is energized to sensor experiment model, observes power supply indicator the most working properly, the download program write to single
In sheet machine, download program is complete, and display screen display weight of object is 0g；
6) experiment of weighing is started
The scale pan is put the counterweight of standard weights successively, records the measurement result of display screen display simultaneously, analyze experiment
As a result, computation and measurement error；
7) valuation functions experiment
First on the scale pan, put counterweight, record the weight of the object of systematic survey, then object unit price is set by button, presses
After lower acknowledgement key confirms, recording the object total price of system-computed, after pressing preservation function key, system preserves data；Relay again
Put new counterweight, unit price is set, observed and recorded weight of object and total price, analyze and judge whether currently displaying object total price is institute
There is the total price being weighed object；
8) peeling functional experiment
The scale pan is placed the object less than 100g weight, presses peeling function key and carry out peeling operation, aobvious on record display screen
The weight shown, and measurement result is compared with 0g, analyze measurement error；
9) overload alarm functional experiment
Placing the object more than 500g weight on the scale pan, buzzer and LED working condition in overview alarm circuit, such as fruit wasp
Ring device is clamored and is cried, and LED flashes, and warning function is normal；
10) serial communication experiment
Above-mentioned steps 6) ~ 9) experiment complete after, by transmitting function key, current experiment data are sent to host computer；
Described host computer is PC.
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Cited By (6)
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| CN107157455A (en) * | 2017-06-26 | 2017-09-15 | 四川脉卫科技有限公司 | It is a kind of to intend true terminal with the pulse condition that fingering is gathered |
| CN109238410A (en) * | 2018-09-06 | 2019-01-18 | 芜湖职业技术学院 | A kind of high-precision electronic weighing device |
| CN109316730A (en) * | 2017-08-01 | 2019-02-12 | 向股份有限公司 | Force measuring system for sports equipment |
| CN110772747A (en) * | 2019-10-29 | 2020-02-11 | 润泰救援科技有限公司 | State monitoring and display system for cab of fire engine |
| CN110954252A (en) * | 2019-11-20 | 2020-04-03 | 上海理工大学 | Pelvis force measuring method combining finite element and strain gauge force measurement mutual verification |
| CN112232685A (en) * | 2020-10-20 | 2021-01-15 | 汤涛 | Engineering quality supervision acceptance real-time detection analysis management system based on big data |
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Application publication date: 20161214 |