I have a pair of Raspberry Pi 4Bs which are essentially "towers" of SATA boards, USB hub boards , Power boards are, multifunction boards, GPIO pin replicator boards and other "hats", all separated and stacked with M2.5 racks. This creates a "tower" several inches high. big enough that instead of getting up and then looking down and reading the GPIO mounted OLED display, I just wanted to look at the stacks and see what the displays were telling me. I ordered 2 of these 40 pin rectangular GPIO expanders and couldn't be happier. My OLEDs mount directly on it with no issues, they don't move once installed, I leave the GPIO pins up for future additions, and the displays I mounted on it read perfectly from my chair. are a great little addition for those using the 40-pin GPIO header on their Raspberry Pi.
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