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How To Calibrate IMU System In DJI Mavic Mini Drone | Easy Guide

Hello guys, you are welcome to today’s article, whose topic is How To Calibrate IMU System In DJI Mavic Mini Drone. So who doesn’t know about DJI Mavic Mini? Because it is a very big and popular Drone brand. Now as you all know that drones are very much in trend these days, everyone is talking about drone shots to make the cinematic videos better. If you are a photographer then drones are a great choice for you to make your videos good and give a natural look. If you also want to capture the view of your city or village from the high of the sky with the help of drones, you can do it very easily.

So basically 4 powerful motors are fitted in the drone with portable fan blades that help the drone to fly in the air. You can control the drone from the ground with the help of its controller and the drone will record your cinematic view very comfortably. You can control your drone very easily through your controller like “Forward, Back, Left, Right“. You will get to see many features inside the drone, one of which is named IMU System i.e Inertial Measurement Unit. So today in this article I will tell you How To Calibrate IMU System In DJI Mavic Mini Drone. So without wasting a second, let’s start today’s article.

What Is DJI Mavic Mini Drone?

How To Calibrate IMU System In DJI Mavic Mini Drone | Easy Guide

DJI is a Chinese manufacturer which is known for the development of drones and aerial vehicles. In May of 2017, DJI introduced the Spark, the first drone you can control with your hands. Later it is known as Mavic Mini. It is a miniature camera drone that you can control with your hands. DJI uses 3D vision sensors, computer vision, and machine learning in Mavic Mini. Talk about its build quality, you get to see very good build quality at such a price. The weight of the Mavic Mini is below 249 grams. You can record 2.7K videos with this drone.

Due to the small size of the drone, you can keep it inside your picket. Talk about its battery backup, so once the drone is fully charged, it can fly non-stop for 25 minutes. The drone gives you a cool and premium feel like I have already told you, you do not need to worry about its size. If you are a photographer and are looking for a low-budget drone, then the DJI Mavic Mini Drone is worth it for you.

Some Important Specifications of the DJI MAVIC Mini:

Camera

Sensor 1/2.3” CMOS
Effective Pixels: 12 MP
Lens FOV: 83°
35 mm Format Equivalent: 24 mm
Aperture: f/2.8
Shooting Range: 1 m to ∞
ISO Range Video:
100-3200 (Auto)
100-3200 (Manual)
Photo:
100-1600 (Auto)
100-3200 (Manual)
Shutter Speed Electronic Shutter: 4-1/8000s
Still Image Size 4:3: 4000×3000
16:9: 4000×2250
Still Photography Modes Single shot
Interval: 2/3/5/7/10/15/20/30/60 s
Video Resolution 2.7K:2720×1530 24/25/30 p
FHD:1920×1080 24/25/30/48/50/60 p
Max Video Bitrate 40 Mbps

Remote Controller Spec & Video Transmission

Operating Frequency Model MR1SS5: 5.725-5.850 GHz
Model MR1SD25: 2.400-2.4835 GHz, 5.725-5.850 GHz
Max Transmission Distance (unobstructed, free of interference) Model MR1SS5
5.8 GHz: 4000 m (FCC); 2500 m (SRRC)
Model MR1SD25
2.4 GHz: 2000 m (MIC/CE)
5.8 GHz: 500 m (CE)
Operating Temperature Range 0° to 40°C (32° to 104°F)
Transmission Power (EIRP) Model MR1SS5
5.8 GHz: <30 dBm (FCC); <28 dBm (SRRC)
Model MR1SD25
2.4 GHz: <19 dBm (MIC/CE)
5.8 GHz: <14 dBm (CE)
Battery Capacity 2600 mAh
Operating Current/Voltage 1200 mA 3.6 V (Android)
450 mA 3.6 V (iOS)
Supported Mobile Device Size Max length: 160 mm
Max thickness: 6.5-8.5 mm
Supported USB Port Types Lightning, Micro USB (Type-B), USB Type-C
Video Transmission System Enhanced Wi-Fi
Live View Quality 720p/30fps
Max. Bitrate 4 Mbps
Latency (depending on environmental conditions and mobile device) 170-240 ms

How To Calibrate IMU System In DJI Mavic Mini Drone | Easy Guide

Intelligent Flight Battery

Capacity 2400 mAh
Voltage 7.2 V
Max Charging Voltage 8.4 V
Battery Type Li-ion 2S
Energy 17.28 Wh
Net Weight 100 g
Charging Temperature Range 5° to 40°C (41° to 104°F)
Max Charging Power 24 W

Intelligent Flight Battery (1100 mAh)

Capacity 1100 mAh
Voltage 7.6 V
Max Charging Voltage 8.7 V
Battery Type LiPo 2S
Energy 8.36 Wh
Net Weight 50 g
Charging Temperature Range 5° to 40°C (41° to 104°F)
Max Charging Power 18 W

Sensing System

Downward Operating Range: 0.5-10 m
Operating Environment Non-reflective, discernable surfaces
Diffuse reflectivity (>20%)
Adequate lighting (lux>15)

 

What is an Inertial Measurement Unit (IMU)?

How To Calibrate IMU System In DJI Mavic Mini Drone | Easy Guide

IMU is an essential component in unmanned aerial systems such as UAV, UAS, and drones common applications include controlling and stabilization, guidance, and correction, testing, mobile mapping, measurements, etc.

The measurements output by an IMU (specific force (speed), angular velocity, and attitude) can be fed into the device such as Inertial Navigation Systems (INS), which calculate relative position, orientation, and velocity to help navigation and control the UAV.

What Is Inertial Measurement Unit (IMU) Calibration?

How To Calibrate IMU System In DJI Mavic Mini Drone | Easy Guide

The IMU (Inertial Measurement Unit) is required to keep your drone steady and level in the air. It’s an integrated sensor that monitors force, angular velocity, and attitude (yes, attitude, not altitude). The drone’s accelerometer, barometer, gyroscope, and temperature are used to do this. Let’s delve a little more into these elements.

Accelerometer: A drone’s proper acceleration is measured using an accelerometer (acceleration relative to its freefall). If your drone tilts when hovering, it could be an accelerometer issue that requires you to re-calibrate your IMU. It could potentially be a problem with the gyroscope. This problem is prevalent if you don’t calibrate your drone on a flat surface.

Barometer: Barometers measure atmospheric pressure, but they’re also used to assist DJI drones to determine their height. The barometer will keep your drone from plummeting out of the sky if it ever switches to ATTI mode in a low GPS location.

Gyroscope: Inside the drone, gyroscopes are little spinning discs. They aid in the measurement of the drone’s attitude (learn more about attitude and ATTI mode here) so that it remains steady and stable in the air.

Thermometer: Thermometers keep the drone’s temperature under control. When you turn on your drone, the IMU warms up depending on the temperature when you calibrated it the last time. So, if you calibrated it at ambient temperature, that’s what it’ll try to achieve. If you calibrated the drone when it was unusually hot, you may discover that it takes an excessive amount of time for the drone to warm up. If this is the case, recalibrate the drone and let it cool before doing so. If you have air conditioning or a fan, you can even put it next to it.

Simply said, the IMU detects any differences in attitude and movement on the horizon, assisting your drone in staying straight and preventing drift. Some drones, such as DJI models, include numerous IMUs, which you’ll need to calibrate if you’re having problems or if you’re prompted to. Others, such as some First Person View (FPV) drones, lack an IMU altogether.

How To Calibrate IMU System In DJI Mavic Mini Drone?

  1. To calibrate the DJI Mavic Mini, first place drone on a flat surface.
  2. Power on the DJI Mavic Mini quad-copter.
  3. Then open the DJI Fly app and connect to the Mavic Mini.
  4. Enter in the General Settings of the DJI Fly app (3 dots).
  5. Open the Main Controller settings (quad-copter icon).
  6. Scroll down and click on “Sensors“.
  7. Click on “Calibrate IMU“.
  8. Click on “Start”.
  9. Next, you will see “Calibrating, please wait”.
  10. Place the Mavic Mini in the various positions shown on the screen.
  11. When the light changes from blue to green, then you are shown the next position to put the Mavic Mini in.
  12. Stand the DJI Mavic Mini on its side with the front-facing right, then check for the green calibration light.
  13. Then stand the DJI Mavic Mini on its side with the front-facing left and check for the light to turn green.
  14. Stand the Mavic Mini on its nose (camera facing down) and wait for the green calibration light.
  15. Next, stand the Mavic Mini quad-copter with its back end facing down and watch for the green calibration light.
  16. The last DJI Mavic Mini calibration position is to place the quad-copter upside down on the flat surface and wait for the green light.
  17. This completes the DJI Mavic Mini Calibration with the message stating “IMU calibration complete. Please restart your aircraft“.
  18. Click ‘OK’ and restart the quad-copter.

Here is a video for better understanding:

What should you do if DJI Mavic Mini IMU calibration failed?

  • Check the surface flatness where you are doing the calibration process.
  • Try the Mavic Mini IMU calibration a second time.
  • Do the compass calibration.
  • Check the Mavic Mini firmware and update if there is a new one available.
  • Allow the quad-copter battery to fully discharge or remove the battery from the Mavic Mini.
  • Allow the quad-copter battery to fully discharge or remove the battery
  • Wait a couple of minutes & Then charge your battery of the Mavic Mini fully and try the calibration again.
  • Re-install the DJI FLY app just in case this issue is with the app not sending correct data to the Mavic Mini.
  • If the IMU is still un-calibrated, then contact DJI or the retail outlet or store where you purchased the Mavic Mini

Last Words

Today, I have briefly described the IMU System calibration process of the DJI Mavic Mini. Side by Side also describes camera Specs, remote controller, battery backup, etc. If you liked it, then comment below. Tell me about the next topic that you want to read. If you have any problem in calibrating your DJI Mavic Mini Drone with IMU System, then you will definitely tell.

Thanking you for reading this article. Stay Home, Stay Safe.

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