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Please note that two different units are used on the figures below, SI system millimeter(mm) and imperial system thousandth of an inch(mil). This is because of the 100mil pin headers used, see also explanation below. To convert mil's to millimeters and vice versa use formula 100mil's = 2,54mm.
All 100 mil pin headers are in 100 mil grid, the M3 mounting holes are in 50 mil grid aligned to the centers of the 100mil headers. The module is symmetrical, turning it 180 degrees will keep all I/O and Power pins in both 50 pin headers in compatible places.
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