Accelerometer is one of the key sensors in the UAV, responsible for measuring acceleration along the X, Y, and Z axes. Its accuracy determines the smoothness of the flight, especially in stabilization modes (Angle, Horizon, Mission Flights by GPS). If the readings are off, the drone may drift, roll, or even flip during takeoff. Let's figure out how to properly calibrate the accelerometer.

Why calibrate an accelerometer?

• Accuracy of readings – Without calibration, the controller receives distorted data about the position of the vehicle.
• Flight stability – errors lead to "drift" even in position holding mode.
• Safety – incorrect data can cause an accident during autonomous flights.

Calibration must be carried out in the following scenarios:

• After flashing the flight controller (FC).
• When replacing the FC or accelerometer.
• If the drone behaves unstable (tilts, shakes).
• After strong impacts or vibrations.

How to calibrate the accelerometer in LOGOS?

1. Preparation

• Avoid vibrations and magnetic interference (near motors, metal).
• Connect the drone to the computer via USB or telemetry.
• Run the LOGOS GCS program.
• Connect to the drone from the program by selecting the network type "AUTO(SERIAL)".
• Go to the section "UAV Settings" → "Accel".

2. Calibration

• Click the "Calibrate" button - the first image should be outlined in white.
• Place the drone on a flat horizontal surface, as shown in the 1st image in the program and click "Confirm".
• Place the drone on the left side, as shown in the 2nd image and click "Confirm".
• Continue changing positions and confirming them, following the instructions in the images until they are all outlined in green.

3. Checking the calibration

If the drone is assembled for the first time, we strongly recommend that you complete all the settings and only then start testing. Follow the instructions below if you have finished the settings, or you have checked the accelerometer calibration on an already configured device.

• Place the drone on a flat surface in a safe place for flying outdoors.
• Connect to the drone via telemetry modems.
• Press the buttons "Start Engines" → "Take Off" sequentially - the drone should take off and hold the horizon.
• If there is drift, repeat the calibration or check the vibrations (adjustments may be required).
• Click the "Landing" button - the drone should land and stop its engines.

Common Problems and Solutions

• Drone tilts after calibration → Check the surface levelness, recalibrate.
• Constant drift → Possible vibrations (install the soft pads from the kit under the flight controller).
• Calibration error → Check the sensor connection, reboot the flight controller.

Conclusion

Calibrating the accelerometer is a simple but critical procedure. It should be performed regularly, especially after changes in the design or firmware. A properly calibrated sensor will ensure smooth and predictable flight, reducing the risk of accidents.

Additionally: for professional UAVs, you can use precise calibration via MATLAB or specialized stands, but for most amateur models, standard tools are enough.

Interested in drones?