# Calibrate IMU RB5

Source: https://forum.modalai.com/topic/3148/calibrate-imu-rb5
Category: Development Drones (https://forum.modalai.com/category/44/development-drones)
Tags: rb5
Posted: 2024-02-26 18:55:05 UTC by vjuliani
Replies: 8 · Views: 1917

## vjuliani · 2024-02-26 18:55:05 UTC

Hi,

Is there a way to calibrate RB5 IMU sensors without QGC? Or using QGC is the only way?

I am constantly having calibration problems after a few flights, such as "High Accelerometer Bias". When it happens, I try to calibrate accelerometer again, but after doing that, the calibration gets inconsistent, sometimes the drone works fine, sometimes it loses control mid flight.

Also, it usually happens after the drone stayed in the sun for 10-15 minutes. Is it possible to be a temperature problem?

This is the voxl-version:

![image.png](https://forum.modalai.com/assets/uploads/files/1708972765322-image.png) 

I can't use IMU server to do a temperature and IMU calibration because RB5 has only imu_px4, right? So, using QGC is the only way to calibrate imu_px4?

## Reply by Moderator (ModalAI staff) · 2024-02-27 16:15:29 UTC

@vjuliani Your build is really old, can you please update the software? https://docs.modalai.com/Qualcomm-Flight-RB5-system-image/

## Reply by vjuliani · 2024-02-27 19:28:59 UTC (in reply to Moderator)

@Moderator, thanks for your reply.

We can update the software.

Do you think the new software version should solve the issue?

## Reply by vjuliani · 2024-02-28 12:32:20 UTC (in reply to vjuliani)

@Moderator 

Does this new build also updates the firmware version of the Quectel Board?

Currently we are using this version:
![image.png](https://forum.modalai.com/assets/uploads/files/1709123504333-image.png) 

Do you recommend a update on this?

## Reply by tom (ModalAI staff) · 2024-02-28 18:22:54 UTC (in reply to vjuliani)

@vjuliani We don't currently touch the firmware on the Quectel board

## Reply by vjuliani · 2024-03-13 19:48:01 UTC

Ok, thanks @tom.

We didn't upgrade the build yet.

In relation to the problem, we did some flights and experienced it again.

Below are the flight logs, you can use: https://logs.px4.io/upload to visualize them.:

https://www.mediafire.com/folder/74yd2f8tdnjqq/RB5_flight_logs

Can you find any indicators of the problem in the logs, such as high temperature, for example?

## Reply by vjuliani · 2024-03-13 19:54:22 UTC

In the flight with problem, we performed sensors calibrations using QGC.

The flight with no problem happened a couple of hours after the first flight with problem and no calibration was performed.

## Reply by tom (ModalAI staff) · 2024-03-13 20:21:57 UTC (in reply to vjuliani)

@vjuliani Can you open a new thread for this issue so our whole team gets eyes on it?

## Reply by vjuliani · 2024-03-13 21:43:13 UTC (in reply to tom)

Yes, @tom.

Thank you