Their eight-and-a-half-foot tall Saphira can rise from her turret, extend her wings, turn and nod her head, and shoot huge balls of flame. The team cut the steel body parts with an oxy-acetylene torch and added solenoid valves to move Saphira's joints. Next they wrote scripts that link a joystick through a laptop to the Arduino, which sends movement commands through a motor controller to the valves. To ignite the propane that produces the fireballs, they modified an existing design that uses a switch. But Saphira's eyes, made of ping-pong balls and a lightbulb, would have melted if a continuously lit pilot light had been mounted in her head, so they jerry-rigged the switch to simultaneously release propane and briefly fire an auto spark plug.