The keypad uses an onboard ATMega328P to scan the matrix for button presses, decode them, and send them via UART or I²C to an Arduino. [ELECTRONOOBS] has the PCB files available via Patreon for ...

Who wants to push a button on a slot ... open-source three-color matrix slot machine complete with handle. In this case, you’ll be losing all of your nickels to an Arduino Pro Mini.

The Nova board is powered by an RP2040 microprocessor, and all of the LEDs on the matrix are individually addressable. Snake ...