cool project! reminds me of the Garmin virb overlays. An idea: some phones have ANT+ receiver, and can collect metrics from sports tech dongles, i.e. tire press

cool project! reminds me of the Garmin virb overlays. An idea: some phones have ANT+ receiver, and can collect metrics from sports tech dongles, i.e. tire pressure, wheel rotations and pedal rotations, and probably even other small sensors as well.