3 ms·
Even relying on GPS is overdoing it. Paint a white stripe on a tire using a permanent marker, and then mount an IR emitter and phototransistor in the wheel well
by oh_sigh 7y ago
Even relying on GPS is overdoing it. Paint a white stripe on a tire using a permanent marker, and then mount an IR emitter and phototransistor in the wheel well. Knowing the diameter of the tire and the time between revolutions lets you easily figure out speed.
- 3fe9a03ccd14ca5 7y agoGreat idea! But I think this is harder than GPS because the chip simply spits out speed and direction.