An electronic circuit controls the remote on a remote-controlled car. A person’s initials are spelled out as the car drives around the “track”.
I hacked the remote adding a connector for a circuit that automates the joysticks. It worked ok but required a lot of intervention. Without feedback on actual position of the car, it would draw a slightly different pattern each time as the batteries ran down thus slowing the car’s speed of travel. Great fun! (Despite the constant tinkering on Christmas morning.)