How to output OAK4 SoM Pro pipeline result on UART?

nabelekt-vl

We are considering the use of a camera with OAK-FFC 4P PoE which has OAK-SoM Pro onboard. We'd like to offload the pipeline result to a secondary board that has a simple microcontroller.
Is there a way to do this over UART?

From https://docs.luxonis.com/hardware/platform/deploy/oak4-som-development-guide/, it looks like there are UART pins available on the OAK4 SoM.
Does this mean that there are also on the OAK-SoM Pro?

https://docs.luxonis.com/software-v3/depthai/examples/script_uart shows a demo, but the video is not available and it looks like the process requires some soldering to pins on the OAK-FFC-4P.
Are those pins as readily available on the OAK-FFC 4P PoE?

Any suggestions for how to get the data to the MCU other than UART?
The MCU has I2C and SPI available as well.

Can the SoM function as an I2C client?
From the schematic for the OAK-FFC 4P PoE at luxonis/depthai-hardwareblob/master/NG2093_OAK-FFC-4P-POE/Docs/Schematic%20PDF/Production.PDF, it looks like AUX IO HEADER has I2C3 exposed? Is that accessible via a Python pipeline script?

We appreciate any thoughts on this. Thanks.

jakaskerl

Hi nabelekt-vl
Apologies for the confusion, you seem to be mixing OAK4 SoM and the RVC2 series devices (4P OAK SoM PRO). These are two very different platforms.

For OAK SoM Pro - https://docs.luxonis.com/hardware/platform/deploy/ffc/#FFC%20deployment%20guide-Extending%20functionality-UART. Looks like the UART is not exposed on the POE variant though, perhaps you can use SPI interface instead. We had nodes for this https://docs.luxonis.com/software/depthai-components/nodes/spi_out/ - but hasn't been tested for a very long time. Probably still works. I2C would need to be controlled via Script node which is current not possible.

Thanks
Jaka