Keypads are very handy input devices. And there are many great libraries written to interface to keypads! Using this firmware that scans the keys and an 3.3v 8MHz Arduino Pro-Mini, it's easy to create ...

Arduino Pro Mini ICSP and FTDI Programming Board This shield is used to flash my Arduino Pro Mini with OptiBoot bootloader and to upload sketch to it. Optiboot is less Flash consuming than classic one ...