采用DS18B20温度传感器和AT89C51单片机实现温度的检测，并结合MAX232的电路实现与PC机进行数据通信。另外在拨码开关的结合下进行电路的工作模式切换，可实现电子秒表和电子时钟的附加功能。-Using DS18B20 temperature sensors and AT89C51 MCU temperature detection and integrated circuit MAX232 Implementation and PC machine data communications. Also in the combination of DIP switches under the mode of the circuit switching can be realized and electronic clock electronic stopwatch additional functionality.