Many times, we are required to put inputs to our microcontroller based projects, that is when a 4 x 4 matrix keypad comes into play. It has 16 keys in total that acts as input keys for specific characters/digits. Beneath each key is a membrane switch. Each switch in a row is connected to the other switches in the row by a conductive trace underneath the pad. Each switch in a column is connected the same way – one side of the switch is connected to all of the other switches in that column by a conductive trace. Each row and column is brought out to a single pin, for a total of 8 pins on a 4X4 keypad:
How to use
Project Tutorial –
https://lastminuteengineers.com/arduino-keypad-tutori
Common Applications
1. To take inputs from users.
Some example projects that students can try out in the ATL Lab
1. Secure lock using keypad module – ( )
https://projecthub.arduino.cc/mckean0/2d99999f-d375-4b8b-89b5-19b01005444d
2. Tech-TicTacToe using Keypad and LED Matrix –
http
Safety Measures to follow
1. Don’t press the keys on the keypad with excessive pressure.
2. Make sure that it is not placed in a circuit that’s producing excess heat.
Important Links
1. How does a keypad module work (https://youtu.be/vl1-R6NsejM)
YouTube Video
