[Sun Yat-sen University Competition] Portable temperature measurement system

Award information: Third prize in the electronic design competition at Sun Yat-sen University

Team member information: Captain: Liu Yonghui Player: Li Jinxuan

Brief description of the task title

Design and produce a portable temperature measurement system to realize low temperature reminder and high temperature alarm functions.

basic requirements

① Complete the temperature measurement system circuit design and board manufacturing and debugging. 

②When the buzzer temperature is higher than 30 degrees Celsius, an audible alarm will sound within 1 second. 

③Upload the temperature information to the computer for real-time viewing. 

play part

①Add an LCD or OLED screen to display the temperature. 

②Add a button to modify the temperature alarm threshold. 

③ Feel free to DIY a shell to make the system stable and beautiful.

Control section

From the perspective of function and versatility, we chose the STC89C51 chip as the interface chip to realize the core control function. In addition, because the 89C51 microcontroller has become very popular, its retail price is also very low, low cost and high performance.

Temperature collection

In the selection of temperature sensor, we use temperature chip DS18B20 to measure the temperature. The chip's physical and chemical properties are very stable, and it can be used as an industrial temperature measurement component, and the component has a good linear shape. At 0-100 degrees Celsius, the maximum linear deviation is less than 1 degree Celsius.

display module

In terms of display selection, we use OLED to display temperature and alarm thresholds.

block diagram