For advanced features, the remote control has a three-axis gyro integrated with a three-axis accelerometer (U2).
Figure 1. Gyro/accelerometer circuit
The circuit is connected to the MCU by the first I2C. If you want to use the second I2C there are four solder bridges that you need to change:
- Solder SB22 and SB23
- Cut SB20 and SB21
This circuit is a ±250° per sec/±500° per sec/±1000° per sec/±2000° per sec selectable three-axis gyro and a ±2 g/±4 g/±8 g/±16 g selectable three-axis accelerometer.