Much more than just a motor and a wheel, the wheel modules from Roomba robot vacuums come with a resilient gearbox, a drop switch, and even a hall effect encoder for tracking your creation’s position and speed. They’re easy to remove if you’ve got a Roomba to salvage from, or dirt cheap on eBay – even if you have to buy them they are probably the best deal out there for indoor robot wheels. Below is a full how-to video with removal, disassembly, and a lot more details. Below the video is a wiring diagram if that’s all you need. Details in the video to enter the giveaway!