超声波测距模块hc-sr04利用stm32编写，利用串口通信显示，精度高，方便移植。-Ultrasonic Ranging Module hc-sr04 use stm32 preparation, use of serial communication display, high precision, easy to transplant.

利用HC-SR04 超声波模块测距，通过UART发送给PC机的串口，通过串口调试助手查看距离数据。(Use HC-SR04 ultrasonic module ranging, sent to the PC through the UART serial port, through the serial debugging assistant to view distance data)

用于SR04超声波测距的STM32程序，使用定时器计算距离。串口打印输出距离值。(The STM32 program used for SR04 ultrasonic distance measurement is to use the timer to calculate the distance. Serial print output distance value.)