PicoBerry - small CM4 carrier board with full 40-pin GPIO header
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PicoBerry is a tiny Raspberry Pi CM4 carrier board, which has technical specification, as following:
You can connect to the CM4 module standard HAT boards, such as LCD screens (with SPI or DPI interfaces), audio DAC boards, RS232/485 or CAN interfaces, and many more...
Here you can find:
Project published as Open Source Hardware (OSHW) under CERN OHL v1.2 (Open Hardware Licence).

Project has been certified as Open Source Hardware by the Open Source Hardware Association (OSHWA).
UID is: PL000010

https://certification.oshwa.org/pl000010.html
...and much more:
https://twitter.com/search?q=picoberry&src=typed_query&f=live
https://www.google.com/search?q=picoberry+cm4&oq=picoberry+cm4
