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Raspberry Pi Compute Module 4 IO Board : ID 4787 : $35.00 : Adafruit Industries, Unique & fun DIY electronics and kits
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Buy a Compute Module 4 IO Board – Raspberry Pi
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32 GPIO Expansion Module 8-bit Input & Output IO Extend Adapter Module for Raspberry Pi IO Extend Adapter 74HC595 Chip - AliExpress
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PiGear Nano: Nano-ITX Raspberry Pi Compute Module 4 carrier board | UUGear
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