The TCA8418 has the ability to act as your I2C multi-tool for handling keypads, buttons or LEDs. It has 18 total ‘I/O’ pins, 10 columns and 8 rows. Additionally, it has a 10-element event queue, so even if you don’t get to the interrupt immediately, keypress and release events will be held for you.
The Adafruit TCA8418 Keypad Matrix and GPIO Expander guide has everything you need to get started with using this keypad breakout. There’s pages for overview, pinouts, CircuitPython, Arduino and download resources.
Check out the full guide: Adafruit TCA8418 Keypad Matrix and GPIO Expander
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
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