A rear car speedometer @PierreMuth

Pierre Muth blogs about building a rear car speedometer, a project many of us have thought about or would want to build.

It’s subject to debate and delicate, but maybe you experienced this situation yourself while driving a car. The driver of another car, just behind you, would kindly like to travel at a higher speed. On your side however, you apparently yet travel at the maximum legal speed.

An hypothesis is the speedometers of both cars don’t agree. So why not showing in real time your actual traveling speed on the back of the car ?

Let’s make it looks like a Sonic the hedgehog power-up monitor !

Check out the build details here on the post.