Adafruit 3x4 Phone-style Matrix Keypad
This keypad has 12 buttons, arranged in a telephone-line 3x4 grid. It's made of plastic with sturdy plastic buttons. The keys are connected to a matrix so you only need 7 micro-controller pins (3-columns and 4-rows) to scan through the pad. Includes Keypad only - Arduino/ Breadboard and connector cables not included!
There's a great Matrix Keypad Arduino library that should work great with this item with minor adjustments. It's basically a sturdier version of our Membrane 3x4 Matrix Keypad and comes with 7 header pins pre-soldered on for easy plugging. Starting from the left there are three column pins, and then to the right are the four row pins.
- Force: 160-180g
- Contact Resistance: <100Ω
- Weight: 23g
There is a very nice Matrix Keypad Arduino library that works great with this item. This will swap the * and # keys and also let you connect to the Arduino with all the pins in order/in a row starting from digital 2 thru digital 9.
The only thing we suggest is to change the initialization code in the examples to this:
#include "Arduino.h" #include "Keypad.h" const byte ROWS = 4; //four rows const byte COLS = 3; //three columns char keys[ROWS