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 value of single-chip project)