4×4 Large Button Matrix Keypad for Arduino – 16 Keys on 8 I/O Pins | JAYCAR

You're three buttons deep into your Arduino build and you've run out of pins. Happens to everyone. This 4×4 large-button matrix keypad gives you 16 keys on just eight I/O connections. Wire pins 1–8 to digital pins 2–9, load the included sketch in your IDE, and you're building. No multiplexing headache, no port juggling. The buttons are big enough that you can actually find them with a calloused thumb at 9pm when the project is due tomorrow

• 16 large buttons controlled through just 8 I/O pins — saves ports for your sensors and actuators
• Direct connection: keypad pins 1–8 to board digital pins 2–9, no extra IC needed
• Ready-to-load Arduino IDE sketch included, so you're running in minutes not hours
• Large-button layout makes it practical for hand-built panels and demo rigs
• JAYCAR branded component, sourced locally