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Topic: running the sm5100b off of battery power (Read 459 times) previous topic - next topic

Jun 21, 2012, 01:14 am Last Edit: Jun 21, 2012, 01:52 am by cangeceiro Reason: 1
So i have a circuit with the sm5100b GSM/GPRS shield attached.  now that everything is working I want to power it with out requiring my computer.  Up to this point I have just been using it over usb which has worked fine.  Now i have the system powered via a 12v battery attached to the arduino power supply plug.  At 12 volt the arduino powers up just fine and my sketch begins to run, I have status LEDs to confirm this, however the sm5100b never reports anything back.  If i use a voltage divider to bring the voltage down to 9v, lights are fairly dim, and it appears as though the arduino just keeps reseting itself.

Any ideas?

UPDATE:
I also have tried wiring 2 of the 12v 1.3Ah batteries in parallel to see if it was a problem with current draw and that was also unsuccessful.

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