CN109883574A - A device for measuring temperature characteristics of thermistor based on embedded system - Google Patents
A device for measuring temperature characteristics of thermistor based on embedded system Download PDFInfo
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- CN109883574A CN109883574A CN201910216206.0A CN201910216206A CN109883574A CN 109883574 A CN109883574 A CN 109883574A CN 201910216206 A CN201910216206 A CN 201910216206A CN 109883574 A CN109883574 A CN 109883574A
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Abstract
本发明涉及一种基于嵌入式系统的热敏电阻温度特性测量装置，包括壳体、主控芯片、采样电阻、拨挡开关、温度传感器、显示屏、12V直流电源、加热装置、3.3V稳压电源、12V电源插口、ADC模数转换器；ADC模数转换器内置于主控芯片，采样电阻与热敏电阻串联，可用拨挡开关选择不同的采样电阻与热敏电阻串联，温度传感器、显示屏与主控芯片连接，温度传感器与热敏电阻悬挂在加热装置内，12V直流电源通过设置在壳体的电源插口与3.3V稳压电源连接。优点是：以主控芯片为核心，显示器、温度传感器等电子器件为执行装置的嵌入式系统，结构简单、成本低廉、操作性强，可用于热敏电阻温度特性测量实验的教学实践。
The invention relates to a thermistor temperature characteristic measuring device based on an embedded system, comprising a casing, a main control chip, a sampling resistor, a shift switch, a temperature sensor, a display screen, a 12V DC power supply, a heating device, and a 3.3V voltage regulator. Power supply, 12V power socket, ADC analog-to-digital converter; ADC analog-to-digital converter is built in the main control chip, the sampling resistor is connected in series with the thermistor, and the dial switch can be used to select different sampling resistors in series with the thermistor, temperature sensor, display The screen is connected to the main control chip, the temperature sensor and the thermistor are suspended in the heating device, and the 12V DC power supply is connected to the 3.3V regulated power supply through the power socket set on the casing. The advantages are: the embedded system with the main control chip as the core and the display, temperature sensor and other electronic devices as the execution device has the advantages of simple structure, low cost and strong operability, and can be used for the teaching practice of the thermistor temperature characteristic measurement experiment.
Description
Technical field
The invention belongs to a kind of thermistor temp characteristic measuring instrument more particularly to a kind of temperature-sensitives based on embedded system
Resistance-temperature characteristic measuring device.
Background technique
With the development of science and technology the system of more and more electrical component compositions can substitute manual operation, embedded system
The sight of people is progressed into, embedded system (Embedded system) is that one kind " is completely embedded into inside controlled device, is
Specific application and the dedicated computer system designed ".Existing thermistor temp feature measurement experimental rig is using single armed electricity
Bridge measures thermistor resistance value, and the temperature of heat-conducting medium (tap water) is measured using traditional glass thermometer, in actual experiment
There is temporal error in the process, i.e. temperature and resistance value does not correspond to, and inaccurate using glass temperature meter reading.
Summary of the invention
In order to overcome the deficiencies of the prior art, the thermistor temperature based on embedded system that the object of the present invention is to provide a kind of
Characteristic measuring device is spent, Yi Shixian thermistor temp feature measurement, structure is simple, low in cost.
To achieve the above object, the invention is realized by the following technical scheme:
A kind of thermistor temp characteristic measuring device based on embedded system, including shell, main control chip, sampling electricity
Resistance, dial position switch, temperature sensor, display screen, 12V DC power supply, heating device, 3.3V regulated power supply, 12V outlet,
ADC analog-digital converter；
Main control chip, several sampling resistors, 3.3V regulated power supply are immobilized in the shell, and ADC analog-digital converter is built in master
Chip is controlled, sampling resistor is connected with thermistor, and different sampling resistors can be selected to connect with thermistor with position switch is dialled,
3.3V regulated power supply provides reference voltage for ADC analog-digital converter, and temperature sensor, display screen and main control chip connect, temperature
Sensor and thermistor are suspended in heating device, and 12V DC power supply passes through the outlet that shell is arranged in and 3.3V is steady
Voltage source connection, 12V DC electricity are converted into 3.3V direct current by 3.3V regulated power supply；It is marked with water in the heating device,
Temperature sensor, thermistor are respectively positioned under elevation of water at about 1/2, and are suspended from water, and water surface elevation is heating device
2/3。
The ADC analog-digital converter is for measuring wheatstone bridge potential value, reference voltage 3.3V.
The main control chip is STM32F103RCT6 chip.
The temperature sensor is DS18B20.
A kind of application method of the thermistor temp characteristic measuring device based on embedded system, comprising the following steps:
1) 12V DC power supply is the power supply of 3.3V regulated power supply, measures list through ADC analog-digital converter under 3.3V regulated power supply
The potential value of arm electric bridge, ADC analog-digital converter convert analog signals into digital signal, are transferred to main control chip；According to sampling
Resistance parameter calculates thermistor resistance value:
2) under the synchronization for executing step 1), temperature sensor measures the temperature of heat-conducting medium, due to thermistor
The potential value of resistance value and wheatstone bridge is in once linear relationship, directly according to the potential value of the resistance value of sampling resistor and wheatstone bridge
It is calculated in main control chip；The corresponding resistance value of thermograph returned according to temperature sensor；Finally thermistor is hindered
It is worth resistance value corresponding with the thermograph that temperature sensor returns to generate experimental data and show on a display screen.
Compared with prior art, the beneficial effects of the present invention are:
The present invention is using single-chip microcontroller as core, and the electronic devices such as display, temperature sensor are the embedded of executive device
System, of simple structure and low cost, strong operability can be directly used for the religion of thermistor temp feature measurement experiment
Practice is learned, the resistance value of thermistor and the relationship of temperature can be obtained by shirtsleeve operation, and be greatly saved in experiment
The invalid waiting time, effectively avoid unnecessary experimental error, can be promoted the use of in college physical experiment teaching course.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Fig. 2 is electrical schematic diagram of the invention.
Fig. 3 is circuit diagram of the invention.
In figure: 1- main control chip 2- sampling resistor 3- temperature sensor 4- display screen 5- shell 6-12V DC power supply
7- thermistor 8- heating device 9-3.3V regulated power supply 10- key 11- fork shift switch 12- thermistor interface 13-
Ship type switch 14-12V outlet 15-ADC analog-digital converter 16- wheatstone bridge 17- heater.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings of the specification, it should be noted that implementation of the invention is unlimited
In the following embodiments and the accompanying drawings.
See Fig. 1-Fig. 3, a kind of thermistor temp characteristic measuring device based on embedded system, including shell 5, master control
Chip 1, sampling resistor 2, temperature sensor 3, display screen 3,12V DC power supply 6, heating device 8,3.3V regulated power supply 9,12V
Outlet 14, ADC analog-digital converter 15；Main control chip 1, several sampling resistors 2,3.3V regulated power supply 9 are fixed on shell 5
Interior, ADC analog-digital converter 15 is built in main control chip 1, and 3.3V regulated power supply 9 is connect with ADC analog-digital converter 15, temperature sensing
Device 3, display and main control chip 1 connect, and temperature sensor 3, thermistor 7 are arranged in heating device 8,3.3V regulated power supply 9
For the power supply of main control chip 1,12V DC power supply 6 is connect by the way that the outlet of shell 5 is arranged in 3.3V regulated power supply 9.Heating
Water is marked in device 8, temperature sensor 3, thermistor 7 are arranged at the same horizontal position, and are suspended from water；Practical operation
When, lid can be set, and punch at the top of heating device 8 on it, be suspended on temperature sensor 3, thermistor 7 by line
In heating device 8.
Wherein, 12 ADC analog-digital converters 15 are for measuring 16 potential value of wheatstone bridge, reference voltage 3.3V.Master control core
Piece 1 is STM32F103RCT6 chip.Temperature sensor 3 is DS18B20, for measuring thermistor to be measured in wheatstone bridge 16
Under the synchronization of Rt, the temperature of heat-conducting medium is measured, need to be located at water surface elevation about 1/2 with thermistor 7, and cannot touch
Wall.It is equipped with heater 17 in heating device 8, for being heated to the water in heating device 8, is added water to before heating to heating device
At the 2/3 of 8.Display screen 3 is LCD display 3, and 12V DC power supply 6 is the DC power supply of 2A.Sampling resistor 2 can be used: RX70-
E (0.25W~1W, 1k Ω, 2k Ω), the sampling resistor 2 as ADC analog-digital converter 15.Shell 5 can be used transparent nonmetallic
Material production, such as: organic glass, screen are embedded in upper cover, are below main control chip 1 and its circuit.
See Fig. 1-Fig. 3, the application method of the thermistor temp characteristic measuring device based on embedded system, including it is following
Step:
1) 12V DC power supply 6 is the power supply of 3.3V regulated power supply, is surveyed under 3.3V regulated power supply 9 through ADC analog-digital converter 15
The potential value of wheatstone bridge 16 is obtained, ADC analog-digital converter 15 converts analog signals into digital signal, is transferred to main control chip 1；
7 resistance value of thermistor is calculated according to 2 parameter of sampling resistor:
Rt=(ADC_DMA_IN1*R/ (4095-ADC_DMA_IN1)) (1)
In formula (1), Rt: 7 resistance value of thermistor；ADC_DMA_IN1: institute's value is measured using digital-to-analogue conversion；R: sampling
2 resistance value of resistance.
2) in execution step 1) under synchronization, temperature sensor 3 measures the temperature of heat-conducting medium, due to temperature-sensitive electricity
The potential value of 7 resistance values and wheatstone bridge 16 is hindered in a linear dependence；The thermograph returned according to temperature sensor 3 is corresponding
Resistance value；The corresponding resistance value of thermograph that 7 resistance value of thermistor and temperature sensor 3 return finally is generated into experimental data and is shown
Show on the screen.
Key 10, fork shift switch 11, ship type switch 13,12V outlet 14.Key 10 is connect with numerical control chip, is used for
Operate equipment.Ship type switch 13 is used to control the connection on-off of 12V power supply Yu 3.3V regulated power supply 9.12V outlet 14 is used for
Connect external 12V power supply.
4mm banana connector is inserted at 7 the two poles of the earth of thermistor, and banana connector is fixed in the above plate, nonpolarity differentiation.Ship type
Switch 13 is installation's power source master switch, and 3.3V power supply can also be cut off after closing.Fork shift switch 11 (being S1 in the following figure) is sampling electricity
2 selection switch of resistance, improves 7 resistance value measurement accuracy of thermistor.
In use, specifically includes the following steps:
1) 12V power supply line insertion jack is turned on the power switch.
2) it is inserted into thermistor 7 and thermistor 7 and temperature sensor 3 is placed in heating device 8, in heating device 8
Water at room temperature is added.
3) according to line options sampling resistor 2 in the resistance value of thermistor 7, the upper limit is more than 10k Ω selection 10k Ω, is lower than 10k
Ω selects 1k Ω.
4) heater 17 reaches set temperature, and experimental data will be automatically generated and will be shown on LCD display.
6) experimental data is recorded, closing device terminates to test.
As during the experiment because human factor leads to experimental error, needs to change the water in heating device 8 and press reset
Button restarts to test.If experimental data is more than desired extent, it need to check that each section connection is wanted with whether position meets experiment
It asks.
Claims (5)
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| Application Number | Priority Date | Filing Date | Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112763092A (en) * | 2021-01-08 | 2021-05-07 | 维尔斯电子(昆山)有限公司 | Thermistor testing system |
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| CN201021906Y (en) * | 2006-11-21 | 2008-02-13 | 大连大学 | Thermistor Thermometer |
| CN201946185U (en) * | 2010-03-30 | 2011-08-24 | 浙江师范大学 | Thermal resistor experimental instrument |
| CN102800226A (en) * | 2012-07-10 | 2012-11-28 | 沈阳大学 | Digital display temperature resistance magnetic force heating stirrer for experiment |
| CN202939862U (en) * | 2012-11-20 | 2013-05-15 | 张有敬 | Temperature sensing principle demonstration instrument |
| CN204102398U (en) * | 2014-06-24 | 2015-01-14 | 安徽农业大学 | For the experimental box of the volt-ampere characteristic and resistance-temperature characteristic of studying thermistor |
| US20150079579A1 (en) * | 2013-09-13 | 2015-03-19 | Ian James Oliver | Integrated physical sensor grid and lesson system |
| CN209706981U (en) * | 2019-03-21 | 2019-11-29 | 辽宁科技大学 | A kind of thermistor temp characteristic measuring device based on embedded system |
-
2019
- 2019-03-21 CN CN201910216206.0A patent/CN109883574A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201021906Y (en) * | 2006-11-21 | 2008-02-13 | 大连大学 | Thermistor Thermometer |
| CN201946185U (en) * | 2010-03-30 | 2011-08-24 | 浙江师范大学 | Thermal resistor experimental instrument |
| CN102800226A (en) * | 2012-07-10 | 2012-11-28 | 沈阳大学 | Digital display temperature resistance magnetic force heating stirrer for experiment |
| CN202939862U (en) * | 2012-11-20 | 2013-05-15 | 张有敬 | Temperature sensing principle demonstration instrument |
| US20150079579A1 (en) * | 2013-09-13 | 2015-03-19 | Ian James Oliver | Integrated physical sensor grid and lesson system |
| CN204102398U (en) * | 2014-06-24 | 2015-01-14 | 安徽农业大学 | For the experimental box of the volt-ampere characteristic and resistance-temperature characteristic of studying thermistor |
| CN209706981U (en) * | 2019-03-21 | 2019-11-29 | 辽宁科技大学 | A kind of thermistor temp characteristic measuring device based on embedded system |
Cited By (1)
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| CN112763092A (en) * | 2021-01-08 | 2021-05-07 | 维尔斯电子(昆山)有限公司 | Thermistor testing system |
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Inventor after: Su Qifeng Inventor after: Xu Chong Inventor after: Wang Shuo Inventor after: Jiang Xiancheng Inventor after: Yuan Xinming Inventor after: Jia Hongbao Inventor before: Xu Chong Inventor before: Su Qifeng Inventor before: Wang Shuo Inventor before: Jiang Xiancheng Inventor before: Yuan Xinming Inventor before: Jia Hongbao |
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Application publication date: 20190614 |