What does it take to add an IMU to an OAK-D-Lite PCB?

[heyangHEY]

I am learning vio recently and need camera+IMU data, but I only have an oak-d-lite on hand. I found that the circuit for the IMU (BNO085) is reserved on the board

And found the schematic and PCB from OAK_D_LITE_DEV, now there are two problems:

1. The PCB design of lite_dev and lite at the IMU are not the same. I understand that the pcb of lite is not open source due to Myriad X, but can you post the component layout of the IMU part of the lite?
2. Do I need to update the firmware of BNO085 and oak-d-lite after soldering on the IMU? I have consulted before and learned that I need to use https://github.com/luxonis/depthai/tree/UI-test-tools-Production to update the firmware of the IMU, but I don’t know the specific method, so could you please give me a general operating route?

[Luxonis-David]

Hi @heyangHEY,

1. sure we I have attached the schematic part of the IMU on the R2M1E4 version of the board you have.
2. I normally did the same along with the testing of the device, @Erol444 might know some other options
   DM9095_IMU.pdf

[heyangHEY]

@Luxonis-David, Thank you for your timely reply. I marked the component numbers in the schematic diagram on the PCB. Do you think I marked it correctly? In addition, what component is the part with the question mark in the lower right corner? Does the lack of it affect the IMU?

[Luxonis-David]

Sorry about the delay @heyangHEY, and I should have made a screen shoot of this section of the PCB in first place (I forgot there is no silk screen there :) ).
So yes you are correct on all, and the component with question mark does not relate to IMU but stereo camera and does not need to be populated.
I am attaching the screen shot of this area of the PCB which confirms the above.

[heyangHEY]

thx, time to weld the IMU to the PCB. But I'm not clear on the next steps, how can I contact @Erol444, email him?

[Erol444]

Hi @heyangHEY , no need, I am following this Issue:) I think you can flash the firmware to the IMU using ImuNode.enableFirmwareUpdate(True).
Thanks, Erik

[ricardodeazambuja]

@heyangHEY, did it work at the end???

[pulsar666]

@heyangHEY I'm curious to know if this worked out for you. I have an OAK D lite too that doesn't have the IMU chip on it and want to add it for my project