GSM receiving short message control relay
4.0
Application background This procedure through the mobile phone text messages to control the LED light offThe use of SCM serial port 2 and module communication; access method is as followsSTC MCU GPRS;   moduleUsing 11.0592MHz crystal1, the board after the operation of the power indicator light RUNING_LED will blink of a second frequency;2, through the serial port 1 chip can monitor the status of the module;3, mobile phone send "onled" light LED;4, mobile phone send "offled" put out LED;5, using the serial port 2 and module communication, serial port 1 for the output of information.