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Topic: External Power supply doesn't work (Read 6 times) previous topic - next topic


Looks like that kit uses a 9 volt battery clip to barrel connector.  If you have a meter you can ohm out the connector to make sure there isn't a broken wire or check the voltage and make sure the polarity of the barrel connector wasn't wired backwards, it needs to be center tip positive.
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A small 9vdc battery is a poor choice to power an Arduino, especially if your trying to drive leds or other external devices. The current capacity of those batteries is very small and it's voltage will sag low due to it's high internal resistance. Plus they are very expensive batteries when considering the low mah rating they have.



Thanks for the help,
I used my handy-dandy multimeter and narrowed the problem down to poor connections in the external power supply.
It's funny how some problems are so freakishly simple.
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