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HATs and other add-ons • Pi5, nvme adaptors, and gpio pin availability

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I haven’t seen anyone ask about this, so I will stumble ahead and ask the ignorant questions …

There seem to be a lot of differences in how nvme m.2 adaptor boards use or attach to or just block the gpio pins. See a lot of the different boards here at Jeff Geerlings page: https://pipci.jeffgeerling.com/hat.

If a board attaches to only a few pins, I’ll assume they’re only using those, and that the others are free for your use, assuming you can get to them. But if a board attaches to every gpio pin, how do you know which pins they may be using. And even if they’re not using each pin, how would you attach to them when every connector is occupied?

As a prime example, the official HAT+ https://www.raspberrypi.com/products/m2-hat-plus/ covers all of the gpio pins. I can’t tell which (if any) it might be using, or which it’s just passing through, and aren’t all of those 40 female pin sockets filled by the supplied stacking header extender, and thus unavailable for my use?

I might have imagined a different design with passed through gpio pins sticking out on top…

Statistics: Posted by tinker2much — Wed May 15, 2024 2:35 pm



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