利用GSM的GPRS功能，使用AT指令进行短信发送，实现温度监控、超标报警，有串口传输功能，有一定单片机项目参考价值(The use of GSM GPRS function, the use of AT instructions to send text messages to achieve temperature monitoring, excessive alarm, a serial transmission function, there is a certain reference

GSM通信系统的软件设计,通过发送AT指令完成短信的收发和其它相关操作()