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Currently, the smallest circuit board is this one with 26.3 mm x 28.5 mm.

But you likely need some waterproofing around, e.g., heat shrinking tubing, potting, or a CNC-milled enclosure like these.

If dimensions are a concern for you, you probably want to look into heat-shrink tubing or vacuum sealing. Both techniques just add a few millimetres maximum. Otherwise, the smallest CNC-milled enclosure currently on GitHub measures 49.25 mm x 72.17 mm x 15 mm.

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JonasBchrt
Jan 1, 2025
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