超声波测距。将测得的距离通过计算并转化为字符， 通信传给上位机，显示在串口调试助手界面(Ultrasonic ranging. The measured distance is calculated and translated into characters, communicated to the host computer and displayed in the serial debugging assistant interface)

MSP430通过串口实现与上位机的通信。(MSP430 communication with the host computer through serial port)

1.zigbee编写语言为C语言，使用ZStack-CC2530-2.3.1-1.4.0协议栈； 2.APP使用eclipse eda安卓开发，采用sim900A连接外网，可简单修改连接esp8266wifi模块，从而连接外网，app能够实时显示采集zigbee采集的距离； 3.服务api采用的是淘宝云平台的api，服务器长期有效，无需修改； 4.通过cc2530之间通信，采集到rssi值，计算出距离，通过串口上传上位机，该程序能简单修改主函数，实现测距。(1.zigbee is writ

通过STM32F103单片机控制VL6180测距传感器测量距离，并通过串口将距离发送给上位机。本程序使用STM32片上外设IIC来通信，可以通过编程实现IO模拟IIC。(Control VL6180 to measure distance by using STM32F103, and send distance to host computer by USART. This Program using STM32's peripherals IIC for communication, we