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I'm curious if anybody has attempted to use the bare board Pi Zero (without the GPIO pins pre-soldered) as a virtual Pi on a Pi HAT for a full size Raspberry Pi (2, 3 or 4, etc)? I see the possibility of heat issues, but I think this can be avoided using GPIO extenders or cables. Aside from the obvious micro-cluster, one possible benefit of the setup would be to let the two Pis (Zero + Pi 4, for example) share the same GPIO connected hardware (e.g. power, display, fan) in pass-thru, switch or first-come-first-served mode.

Note that my question isn't about assembling an actual Pi cluster using a purpose-built HAT. My goal is simply to interface two Pis in as simple and compact a form factor as possible without the use of special connectors or layered cases, only standoffs or spacers if needed for stability. Then I could just put the setup in a Tupperware like container along with a USB powerbank.

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    Of course they can be connected. How long either operate is another thing and is probably outside the scope of this Q&A site. – joan Nov 9 at 9:09
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    One thing to be wary of ... you'll be connecting output pins to output pins, and input pins to input pins .... with the former, you'll get a build up of data that will eventually cause the connection to explode - with the latter, both sides sucking data on the same connection will cause an implosion - this is by far the worst of the two, as you could potentially create a localised black hole, which could destroy the planet ... obviously, I'm joking – Jaromanda X Nov 9 at 9:14
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    If it's a Zero the consider running it in OTG mode inserted into the USB socket of the mothership larger Raspberry. gist.github.com/gbaman/50b6cca61dd1c3f88f41 – Dougie Nov 9 at 12:19

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