try a few other baud rates, e.g. 19200, 38400, 56700,115200Hi there,
I am working on sim 908 and I am trying to serially communicate with it using arduino mega 2560 . But the problem is, when I send "AT\r" serially I should be getting in response, following:
AT\r
OK\r\n
But I get a lot of garbage
I am using 9600 baud rate 8 data buts 1 stop bit and no parity
Any ideas??
sounds as though you may have a faulty modem - is it overheating? or the power supply failing - check the voltage?Let me check that
But if I keep the modem off for some time like 3 or 4 hours I can use it again without a problem like now I have again got it working
But how can I check the power down condition ?
I didn't send any such commands for that
have a delay of several seconds between transmitting each "AT\r" - you may be sending it commands too fast to process the responseOK its working for the moment and now i have another problem.
I have interfaced the DB-9 port of the GSM module with the RX2, TX2 pins of the Arduino Mega 2560.
I have written a code that sends 'AT\r' continuously and observes the response from the GSM module.
Desired Response should be:
AT\r
OK\r\n
But i get 'AT\r' and after that i get a lot of garbage values
Sometimes even i dont get this response in consecutive form. Like i get
'A<garbage>T<garbage>\r'
Kindly suggest some troubleshooting technique.
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