In order to put SIM900 into sleepmode , i tried the following as a part of a code:
[code] //Enabling sleep mode in SIM900
GPRS_Serial.println(“AT+CSCLK=1”); //Enable Sleep mode, slowclock
//D3 pin of Atmega used to drive DTR pin of SIM900 pinMode(3, OUTPUT); //Pull DTR high to put it into sleep digitalWrite(3, HIGH); delay(100); delay(30000); // 30sec delay where the SIM will go to sleep digitalWrite(3, LOW); //wake up SIM900 delay(100);// a minimim of 50msec is req[/code]
I had wire going from DTR on J11 connector to Arduino D3 to toggle DTR pin. I am using Softserial interface.
After the execution a few times, i cannot get any reponse to any AT commands and looks like GPRS board is not responding to basic AT commands anymore.
Anyone seen this before ?