Use this matrix keypad decoder to add user input to your Parallax microcontroller application. The MEMKey is a programmable keypad encoder which supports both a simple serial communication protocol and the standard PC/AT communication protocol using a matrix keypad as large as 4 X 5.

The MEMKey has the following serial protocol programmable features:

• 1 or 2 wire, 2400 baud, 8N1 format
• Each key can be programmed to return any value from 0-255 and
  standard keys in the PC/AT protocol
• Key alarm pin and fully programmable debounce time
• Typematic action with programmable typematic times
• Features are retained in EEPROM even with power removed
• 64 bytes of user-accessible EEPROM for general purpose use
• 15-pin SIP package measuring 2.25" wide x 1.6" tall

Downloads and Resources:
S³ Memkey Datasheet (.pdf)
Solutions Cubed Product Line (.pdf)