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Pimoroni Automation HAT for Raspberry Pi : ID 3289 : $29.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Raspberry Pi 4 PoE HAT 802.3af Power Over Ethernet Expansion Board with Cooling Fan Temperature OLED for Raspberry Pi 3B+ 4B|Demo Board Accessories| - AliExpress
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