针对市面儿童防丢器功能单一的情况，设计一款智能儿童防丢器满足人们需求。儿童防丢器的终端包含主控 STM32F103C 及外设部分和SIM900A 模块。主要实现当终端识别主控端发送的AT 指令信息，执行基站定位并将位置信息发 送给主控端或拨打主控端电话等相关功能。

Aiming at the single function of children anti-loss device in the market, a smart children anti-loss device is designed to meet with people's needs. The terminal contains the main control STM32F103C, the peripheral part and the SIM900A module. The main function is to realize station location and send the location information to the main control terminal or call the main control terminal when the terminal identifies the AT command sending by the main control terminal.