/diy/ - Do It Yourself

You can always just hook up to the bare keyboard matrix and use whatever.
Add some shift registers if you run out of pins.

>>1611064
I need to go back to my custom calculator project.
I used a cheap Casio clone. To interface with the keyboard (which is connected through a glued on flat cable) I cut off the original controller, scratched off the solder resist, and soldered wires on to it.