Rulers can't do curves. Tape measures can't do 3D. Soumil Goyal solved both — a Digital Pocket Odometer built around our XIAO SAMD21 for under $15. Roll it across any geometry and read the result on an OLED. 11 months on 2× AAA. Full build on instructables 👉 tinyurl.com/uhpjytnr

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