The ADXL345 measures acceleration on three axes. When the board is still, the only acceleration it feels is gravity, so the direction of that 1 g tells you which way is down, and from that the roll and pitch. It is absolute: nothing accumulates, so nothing drifts. Tilt the board with the sliders, then press Shove to accelerate it sideways.
Challenge: With the board level, use Shove to make the accelerometer report more than 15° of pitch.
the real boardwhat the accelerometer says (with its axes)
