Design of Signal Acquisition and Processing System for Temperature Sensor Experiment Instrument

Author(s): Xiaoyan Gao, Guangyi Chen, Haoxuan Li

Temperature is one of the most basic and important parameters in industrial and agricultural production, scientific research and daily life. Therefore, how to realize accurate, rapid and even extreme temperature measurement is one of the important issues facing the society today. The temperature sensor experimental instrument in this project can realize the temperature detection of the current environment, and can realize the detection in different occasions and environments through the setting of upper and lower limits, and upload the measured data to the upper computer for display and storage. The purpose of this project is to design a temperature sensor experimental instrument. The experimental instrument is based on the STM32 single-chip microcomputer as the core, and uses the four-wire thermistor sensor to collect the current temperature value. Through the STM32 single-chip microcomputer, the analog value is converted into digital value, and the collected temperature is displayed on the digital tube. At the same time, the experimental instrument converts the temperature signal into thermoelectric emf signal through the k-type thermocouple, and converts the analog signal into digital signal output through the MAX6675 module. Finally, the data converted by MAX6675 is read through the SPI serial port. The operation results show that the temperature sensor can measure the temperature of the current environment, and the design scheme is reasonable and basically meets the design requirements.

STM32F103, Thermistor, Thermocouple, MAX6675