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can't set gpio to low, trying to control single channel relay (raspberry pi b+) - Raspberry Pi Stack Exchange
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Getting Started with Raspberry Pi 2 Model B v1.1 – vnc setup display 0 and 1 – how to wire setup 12v relay card | dwaves.de
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Raspberry Pi 3 Model B Pinouts Reference Poster Transparent PNG - 800x1200 - Free Download on NicePNG
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