I was asked to build a circuit that will measure the distance travelled of a small vehicle, like a lawn mower.
There's a requirement that it would measure distance travelled in cm/sec. GPS is too inaccurate, and the starting point is unknown. I'm unable to put anything in the ground.
Any ideas? I can use whatever IC I want. I thought of using a camera pointing down, like a mouse, but it seems too complicated to process outside of home.