In this project, I used the 4×4 keypad to create a program that allows the user to enter a password and a green LED will light up if correct, and a red LED will light up if incorrect.The items need are as follows: Arduino UnoBreadboardJumper Wires x 13220 (Ohm) Resistors x2Red and Green LEDMembrance…By: mathissc // Read more: original article.
