accel_counts_per_mss = ((data.accel_minus_g - data.accel_plus_g) / 2.0) / 9.80665;
acceleration = (data.ground_accel - data.flight_accel) / accel_counts_per_mss;
accel_counts_per_mss = ((data.accel_minus_g - data.accel_plus_g) / 2.0) / 9.80665;
acceleration = (data.ground_accel - data.flight_accel) / accel_counts_per_mss;