Thank you sir.
Sir, I just need the circuit connections for SIM900 module to interpret my sms commands (AT Command concept) like if I send ‘1’ via sms, it would send an ON or HIGH SIGNAL, and if I send ‘0’ it would send an OFF or LOW SIGNAL. I cannot get how to make the circuit so as to make the SIM900 interpret the SMS commands so as to send HIGH or LOW signal to the AVR microcontroller.
I am stressing on AVR because I already have an AVR development board. But you may suggest help with 8051.
I am not having any problem with programming or AVR. My problem is how to make my sim900 interpret the sms commands and send HIGH or LOW SIGNALS accordingly to AVR. Rest is okay for me.
Thank You sir very much.