Community
cancel
Showing results for 
Search instead for 
Did you mean: 
MLier
Beginner
1,376 Views

LidarLite v3 - Spikes in distance measurements despite capacitor

Hi,

I face the following problem when using the LidarLite v3 in combination with the Intel Aero RTF Drone:

The sensor is detected and I can access it's distance measurements but every 500 - 1000 ms the measured distance jumps to a value of 0 or something between 10000 and 30000 before returning to the actual distance.

The sensor is connected to the telemetry port and as propsed in the corresponding manual, I put a 680 µF capacitor between VCC and GND but the problem still exists.

When using the lidar with a different FCU, e.g. the PixRacer I don't see any spikes in the measurement data.

Did anyone face the same issue or could provide some help with this problem?

Thanks a lot in advance!

0 Kudos
8 Replies
idata
Community Manager
48 Views

Hello, MarLi

 

 

Thank you for contacting Intel Customer Support.

 

In order to understand your issue better, could you please answer a few questions?

 

Where did you fly the drone? What were the surroundings?

 

What distance were you from the drone?

 

 

Regards,

 

Alexandra
MLier
Beginner
48 Views

Hi,

we fly the drone indoor in an empty part of a factory hall. The floor below the UAV is even and neither shiny nor too light-absorbing.

But we face spikes in the measured distance also in different surroundings and independent of the current flight altitude. That's why we think the problem might be electromagnetic interferences in the wiring or on the peripheral connector board?

During the test I were standing between 2 or 3 meters away from the drone.

Beste regards

MarLi

idata
Community Manager
48 Views

Hello, MarLi

 

 

Thank you for your message.

 

Could you also tell me what firmware/software version are you using?

 

Are you following this guide: https://docs.px4.io/en/flight_controller/intel_aero.html https://docs.px4.io/en/flight_controller/intel_aero.html ?

 

What is the output of the command get_aero_version.py ?

 

 

Regards,

 

Alexandra
MLier
Beginner
48 Views

Hi,

yes, I was following this guide.

Currenty the the px4 1.7.1 stable build is installed on the FCU.

The output of "$ get_aero_version.py" is:

BIOS_VERSION = Aero-01.00.13

OS_VERSION = Ubuntu 16.04.3 LTS"

AIRMAP_VERSION = unkown

FPGA_VERSION = 0xc2

AeroFC firmware version = unkown

Best regards,

MarLi

idata
Community Manager
48 Views

Hello, MarLi

 

 

Unfortunately, we don't have the sensor to run tests on it.

 

Are you able to test the sensor on Yocto software release 1.6.1?

 

In the guide you are following it is mentioned that it needs version 1.6.0 or later.

 

https://downloadcenter.intel.com/download/27399/Intel-Aero-Platform-for-UAVs-Installation-Files?v=t

 

 

Regards,

 

Alexandra
idata
Community Manager
48 Views

Hi, MarLi

 

 

Do you still need help with this issue?

 

 

Regards,

 

Alexandra
MLier
Beginner
48 Views

Hi Alexandra,

yes we still have spikes in the measurement data when connecting the LidarLite to the I2C pins of the telemetry port.

As we don't want to use Yocto on the Aero Compute Board I didn't test the sensor with the latest Yocto release.

Instead we connected the Lidar to a custom Cortex-M4 PCB and stream the measurement data from the PCB to the Aero Computation Board.

This solustion works well and without any spikes.

Best regards

MarLi

wliu28
Beginner
48 Views

Hi MarLi,

I have the same problem with you.

Could you share your specific solution with me?

Thank you!

Best regards

Liu