说明：  红外测温，MLX90614的应用，用STM32F103芯片，IO摸拟I2C总线通讯；文件包有两个头文件及两个C文件；
(Infrared temperature measurement, MLX90614 application, using STM32F103 chip, IO simulation I2C bus communication; file package has two header files and two C files;)