Hi I am using AT89C51 mcu connect with gsm modem . I need to write AT command using c language to run my program. But the code is not working and can not send sms to mobile. Kindly che check for me the below code. I just need press p1^3 button then the prgram can send sms. I did not need receive reply because i did not connect LCD. And i have not ideal how to add LED p3^6 in this program to indicate on and off. This means led on when sending sms or led off when device is not sending sms. Kindly help please.
nd i have not ideal how to add LED p3^6 in this program to indicate on and off. This means led on when sending sms or led off when device is not sending sms.
Try connecting your GSM modem with the PC and you can try the AT commands through hyperterminal.
Also the sending of message format inlcudes country code to be specified along with the no. check that too. use +1 (if in USA), likewise..
After it is verifed then check on the board.