Hi all, for my latest Arduino project, I need to have my Uno use a payphone keypad as input. Yesterday, I took apart the keypad, and it seems that the keypad has 11 keys, obviously, and 7 pins for output. I talked to my dad, who gave this to me (he used to install these babies in Boston), and he sai…

Connecting Arduino to Payphone Keypad

system March 13, 2012, 6:31pm 2

You need a DTMF decoder.
Some useful Google terms there

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