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Topic: sim900 shield not working (Read 897 times) previous topic - next topic


Hi all

I'm using this shield: http://linksprite.com/wiki/index.php5?title=SIM900_GPRS/GSM_Shield

on my Arduino Uno.

I'm using the hardware serial ports (0 and 1) as the tx/rx. I've changed the jumpers on the shield  to reflect this.

I can power the shield on and it connects to the gsm network but serial port say:

'GSM Shield testing.

I'm using this library: http://www.gsmlib.org/

I've modified GSM.cpp to change it to:

'#define _GSM_TXPIN_ 0
#define _GSM_RXPIN_ 1'

Any thoughts why this isn't working?



Quite a few reasons. Take a look at the link in my signature, it's a similar device.
Beginners guide to using the Seeedstudio SIM900 GPRS/GSM Shield

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