51单片机实现温度PID控制，显示模块为20S207DA4，AD芯片为TLC2543，温度传感器为PT1-51 single-chip implementation PID temperature control and display module for 20S207DA4, AD chips for the TLC2543, for PT100 Temperature Sensors

51单片机实现方波信号可调输出，显示输出频率和周期，按键设定方波周期，显示模块为20S207DA4-51 single-chip implementation adjustable output square wave signal, showing the output frequency and the cycle of square-wave cycle button settings, display module for 20S207DA4