It’s always hard to remember to go to the bank after you’ve spent your last bit of cash. DIYer “macobt” put together a tiny indicator for his wallet that lights up when it’s empty.
This trick basically uses a small circuit that puts a tiny battery in your wallet. When you take your cash out, it closes a circuit that lights up the indicator on the edge of your wallet. Check out the video above to see in action.
Make empty wallet cash indicator [Macobt Projects via WonderHowTo
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