Hi Murli,Below is the circuit | Microcontroller › AVR › GSM interfacing › Hi Murli,Below is the circuit June 19, 2012 at 6:21 pm #8086 AmrithParticipant Hi Murli, Below is the circuit & block diagram, kindly use as reference only wysiwyg_imageupload:5058: wysiwyg_imageupload:5059: