How to Make empty wallet cash indicator

For makeing this led indicator for your wallet you will need one CR2016 lithium battery,one small magnet and led diode.
How it works,when there is no money in wallet the led is on and mean to put cash in wallet,when cash is inside wallet the led is off,circuit is very simple but great :)
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Amazing idea... I need to do that too. Thanks!
post some pictures when you make it.
Wonderful. Why you do not build a red led for indication? :) <br>
I know that red led is more efective but at that moment I have just green smd led.
Clever idea!
Thank you.
Awesome :)
That is very creative, I might make this for a friend of mine.
I made this led indicator,because I always forget to put money in my wallet :)

About This Instructable


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Bio: My name is marjancho and I love electronics,makeing gadgets,hack and pranks.
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