Interface GSM with Arduino pro mini

[Mahesh V P]

Hello,

I have been doing a project based on arduino which requires me to interface it with gsm module. I have sim900 gsm module and am not able to interface it with the arduino. The idea of the project is to detect using LDR circuit and send message using gsm. But my circuit is detecting the interference but not sending any message. Any help will be greatly appreciated. The link to the project is http://www.engineersgarage.com/contribution/intelligent-letter-box-using-arduino-and-gsm 

                                                                                                                  -Thank you

[m venugopal]

first of all please check the connections, gsm Tx to the Arduino Rx, and gsm Rx to the Arduino Tx,

if connections are properly connected then check the program,

in program once check the baudrate of serial port.

after that check AT commands.

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