This cornhole board has lights that normally flash white. When a beanbag goes through the hole, the lights flash red. I used an infrared transmitter/receiver pair, a strand of NeoPixels, and an Arduino. Anyone up for a game?
Cutting openings on the Shapeoko.
Finished board with wooden legs and clear acrylic inlay (cut on the laser cutter). Neopixel strand is held in place with wire and masking tape.
A peek at the messy innards. The IR sensor is mounted on the small posts next to the hole.