The AT-COM's breakout sim900 features SMS-out device control, which allows for isolation of the device, four inputs for signal reception and one alarm. via SMS to the server.

        Footprint of the system:

When we want to control the device we just need to text the system properly syntax and the rest of the microcontroller. We can program the microcontroller to work in your favor easily.

The system communicates with the GSM network via module sim 900, AT-COM provides you breakout sim900 to communicate and control becomes easier.

Here is the breakout sim900 diagram.

To control the sim900 module we use some AT commands from SIMCOM.