Arduino Mega replacement for Impression 5 Science Center’s giant calculator exhibit — custom LED display and keypad controller using big-number arithmetic.

Eagle CAD Arduino Mega shield PCB designed for Impression 5 Science Center exhibits — standardizes wiring, connectors, and power for the Giant Calculator and Genome Map projects.

A fully open source, 38-foot, 4-lane pinewood derby timing system built for Cub Scout Pack 2222 — Arduino Mega, custom PCB, IR sensors, solenoid starting gate, and 7-segment displays.