Hi guys, I need to implement a battery life indicator for my project. What I have in mind is a very simple battery life indicator for a 9V battery, using just 1 red LED. So what happens is that when the voltage reaches around 7.8V and below, the red LED lights up. If it is higher than 7.8V, the red…

Battery life indicator

dan333 December 13, 2012, 8:24pm 4

OP, I hope you're not trying to power an Arduino using one of those measly little 9V batteries.

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