What has eight legs, a tail, and is powered by an Arduino Mega? The ClearWalker, of course!
This Strandbeest-style walker employs two motors, controlled by individual H-bridge relay modules to traverse forwards, backwards, and slowly rotate to one side or another via a hesitating leg motion. You can see how the electronics (including a bunch of LEDs) were integrated into this build in the video below.
If you’d like to try a similar control scheme for your ClearWalker/Strandbeest/treaded vehicle using an Arduino and smartphone, you can find it outlined in this Arduino Project Hub post. For the rest of the steps in this quite involved build, and more rather zany inventions, be sure to check out the “Jeremy Cook’s Projects” YouTube page.