. 
Feature:
- 4*4 Matrix Keypad Keyboard Module MCU for Arduino Atmel Stmap S1/2
- External keyboard microcontroller expansion
- The Keypad library allows you to read a matrix type keypad for Arduino.
- 4×4 numeric keypads are most widely used in numerous mini project which requires the user or the operator to give command to the system or to feed in some data
- If you solder on a header, we highly recommend laying down some flux on the pads first, inserting the header pins, then soldering
