Pin 1 - 4 (L -> R) of the keypad module connects to the Pin row_1 - row_4 of Arduino. Pin 5 - 9 of the keypad module connects to the Pin col_1 - col_4 of Arduino.

This 4x4 RGB LEDs Matrix is controlled by an Arduino nano. With a use of 3 TLC5940 connected in daisy chained providing Arduino the capability to extend PWM output pins.

Keypads are widely used input devices being used in various electronics and embedded projects. They are used to take inputs in the form of numbers and alphabets, and feed the same into system for ...