Make a Custom Membrane Keypad for Arduino

My son got one of these Leap Frog toys a few years ago as a gift.  He enjoys playing with it very much.  I am not sure how much counting and learning he is doing but it makes funny noises and sings to him so its a lot of fun. Recently the unthinkable happened.  It died.  Not the batteries but something else.  I took the back off to look at what might be wrong (which was very easy for a toy).  Unfortunately, ...

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