Here is a DIY Keypad project for homebrew developers. This is another first as far as I am aware :)
Note I said 'keypad' because it's a 12 key numeric type with a shift key to provide
a total of 24 possible functions. I did it this way because I wrote the firmware
driver to support it years ago, and it only required slight modification for use
with the PSP's serial port.
Also, the keypad is neat, and I can't imagine any alphanumeric arrangement being as neat if it was knocked up at home.
If you like it, how about donating me some points (yes FORUM POINTS) so I
can buy a black username in bold print
I could recompile the firmware file for a 16F628 to use internal clock at a later
stage. This would make the circuit a little simpler since the crystal and two caps
would then be redundant.
I may or may not update this project depending on takeup/feedback.
At the moment I personaly don't have any use for it that warrants crap
hanging off my PSP, but with all the talk... well here it is....