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Adafruit TCA8418 Keypad Matrix and GPIO Expander Breakout

Adafruit TCA8418 Keypad Matrix and GPIO Expander Breakout

Pimoroni

£5.25

Price read from Pimoroni on 2026-10-22. Check before buying.

It's a GPIO expander, it's a keypad matrix driver... its the Adafruit TCA8418 Keypad Matrix and GPIO Expander Breakout - a cute and powerful I2C GPIO expander and keypad matrix driver! This chip is quite fancy, with the ability to act as your I2C multi-tool for handling keypads, buttons or LEDs. This chip has 18 total 'I/O' pins, 10 columns and 8 rows. You can of course arrange them as a matrix of buttons for a total of 80 switches. Or you can use any subset as individual GPIO input or outputs. The nicest part of the keypad driver is that it has a 10-element event queue, so even if you don't g

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The part other shops don't tell you. Three separate questions, kept separate on purpose, each with its source.