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Nighthawk

Member Since 26 Nov 2010
Offline Last Active Feb 09 2016 09:27 AM

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#50192 Weird problem powering up GSM shield

Posted by Nighthawk on 02 June 2013 - 10:26 AM

Thank you very much. Very insightful

Yes I did pretty much get to grips with the SIM900 now. I'm getting round the power-up problem using a relay as mentionedd before. It is very cumbersome, and wastes a GPIO pin, but it will do for now.

I also managed to hit the USB power limit finally. Determined to find the limit, I dropped in a shift register with LEDs attached ... once I got to 8 LEDs on the SIM900 wouldn't power on any more