But will a 12 v battery work?
You can always rig up a dc-dc converter to bypass the v.reg, but why even bother? It's10X easier to just use 6 cells. GOSH! "it's wasting battery power". Gee, it's only 70%efficient [100%*5V/7.2V] instead of 80-90% efficient, so what, maybe the world will end tomorrow too.
But will a 12 v battery work? Since its within the input voltage range, can I hook it up to the voltage in pin of the arduino?
I'm building game show buttons. It has 16 LEDs, and one small speaker. The lights only go on when someone pushes a button.
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