PIC18F2550-I/SP (PDIP/ SOIC)
Price
$12.27
This PIC18F2550 is a 28-pin Flash-based 8-bit microcontroller with FS-USB (12 Mbit/s) feature.
4x3 Keypad is used to allow user to key in decimal number (0-9), * and # keys.
Features:
Dimension:

Photos (with iBoard):
Tutorial: