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Topic: GSM/GPRS MODEM (SIM900A) (Read 485 times) previous topic - next topic


I am trying to use a SIM900A based GSM modem.
Whenever I am making the GND of module and arduino uno common, the GSM modem doesn't work.
I tried the GSM modem with some other board and its perfectly working.
What can be the issue with Arduino Uno's UART. I tried softwareserial (pin2 , pin3) as well as on default Tx, Rx of arduino, but still not working.

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