On the Voxl2, the M0135 only recognizes the cameras on the JL connector, but not on the JU connector.

[zaimin78]

I am trying to connect four OV7251 cameras to the Voxl2 using the M0135.

I connected them to J6 and J7, but the cameras are only recognized on the JL connector.

I would like to know what the problem is and how to resolve it.

• I have cross-tested the cameras and cables and confirmed that they are functioning correctly.

[Alex Kushleyev]

@zaimin78 , I am sorry for the long delay, we somehow missed this post.

Can you please let me know which kernel variant you are using? (you can check it using voxl-version and look at mach.var.

There is no good way of making this configuration work, because the default function of J6U is actually disabled by default in favor for using a stereo camera setup, as shown here : https://docs.modalai.com/voxl2-camera-configs/#c-10-front-stereo-only-ov7251 . So the kernel variant that is compatible with the M0135 / M0076 interposers, cannot be used for any camera in J6U camera slot (slot 1).

However, the J7U and J7L should work. The way to make the 4th camera work is to use either M0135 or M0076 to connect it to J8L (slot 4) instead of J6U.

I am not sure why your J7U (slot 3) did not work -- can you try connecting without extension cables?

Alex

[zaimin78]

Thank you for your reply.

After upgrading the Voxl2 SDK, two cameras were recognized on the J7.

For now, I have successfully recognized four cameras using the ov7251 via the J6, J7, and J8.

If the J6 recognizes only one camera, does that mean the J8 will also only recognize one camera?

I want to have Voxl2 recognize all four ov7251 cameras and one Boson camera. So, that is a total of five cameras connected.

Is it currently impossible to connect five cameras with Voxl2?

I would like to know if there is a way to make this possible.

Thank you in advance for your answer.

Current test configuration / 4 cameras recognized

Configuration I want to recognize in the future / 4 ov7251s, 1 Boson+