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Telephone keypad

I dismantled an old telephone. The interesting part is the keyboard! This I can use for any further project!
First I had to make some schemes what buttons where attached to what pins.

Next I had to find a 14pins cable. I found one from an old 486, it was attached to some serial port.
First de-solder the old cable, next solder the new cable on it again!

The first project with this was the Code Lock from Bert Van Dam’s book (Pic microcontrollers).
Enter 4 digits, if they are right you’ll get access, if not.. keep on trying 🙂

Published inElectronics

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