Boards pinouts?

freq63

I recently bought second hand a sandwich with Beaglebone Black, Bela.io (written on the board) and Bela Audio Expansion Capelet.
I can't find easely*** like I would with any other board the pinouts here https://learn.bela.io/pin-diagram/ or even online at all.
Are these boards not official from Bela?
Does anyone knows where I could find at least the pinouts of these boards well described?

***I am spending so much hours trying to port some pure data patch on Bela that I admit lacking more patience at the moment with everything related to Bela. I hope someone will point me in the right direction about these pinouts.

giuliomoro

Do you have a Bela cape? The Bela audio expander capelet is an expander for the Bela cape.

So you need:

BeagleBone Black
Bela cape
audio expander capelet

This is the product page https://learn.bela.io/products/accessories/audio-expander/
The pinout of all the pins on P8 and P9 and of the analog inputs and outputs is the same as the Bela cape. The headers for enabling the inputs and setting the input gains are marked and explained at the above page.

freq63

Thanks for your help. I see the audio expander.
This is what I have: https://postimg.cc/gallery/2kCgGpp
The second board in the sandwich is this here (if I take the top board away). Does a page exists with infos about his board please?
https://postimg.cc/WdByyc1H

giuliomoro

The one in the middle is a bela cape rev B4 . The online documentation and pinout for the bela cape applies to it. Combined with the docs I linked above, they should all work together.

Is there anything that doesn't work for you specifically?

freq63

giuliomoro Thank you, I see.
I still don't know what all pins on all headers do. I'm certainly lacking the ability to look where I should.
Must be because I'm used to this kind of pinouts view which always gives a perfect overview at hand.
https://pico.pinout.xyz/
https://www.pjrc.com/teensy/pinout.html
Etc etc.

giuliomoro

All pins relevant to the user on the Bela cape itself and on P8 and P9 are labelled here. The audio expander has only a handful additional pins, labelled at the product page; as these are just a handful and clearly labelled on the PCB, there's never been a need for a dedicated pin diagram for them. Both of these links you already had.

If you care about all the pins on P8 and P9, other than the ones used for Bela digital channels, see here https://learn.bela.io/using-bela/technical-explainers/pins-used-by-bela/ and in particular the linked documents https://github.com/BelaPlatform/Bela/wiki/BeagleboneBlackBelaP8HeaderTable.pdf and https://github.com/BelaPlatform/Bela/wiki/BeagleboneBlackBelaP9HeaderTable.pdf .

Is there anything else not covered above?

freq63

giuliomoro Sorry but what do you mean with P8 and P9?
Are these versions of the Bela board?

giuliomoro

P8 and P9 are the two long 2x23 headers on the BeagleBone Black, whose signals are exposed on the Bela cape's stacking headers.

freq63

Is it possible to get a file like a .dxf that I can import in my PCB design software (Diptrace) which contains the Bela Cape rev 4 headers on it?
I need only the board and the pins (no components), only the footprints, so I can make my own PCB that I will plug onto the capelet to allow me to have my 4 x distance sensors and the circuit that goes with it (resistors for voltage dividers) just plugged on top, like I did with my Arduino.

EDIT: oops wait! I might find what I'm looking for here.
https://github.com/BelaPlatform/bela-hardware/tree/master/bela-kicad-library/footprints/Bela.pretty
Please ignore or delete my post.