Engineer builds DIY mmWave radar system for material classification

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A developer named Gauthier Lechevalier has built a millimeter-wave (mmWave) radar system capable of classifying different materials. The project is documented on his personal website, where he shares technical details of the build. mmWave radar operates at high frequencies and can detect material properties beyond simple motion or distance sensing. The project has garnered attention on Hacker News, reflecting growing hobbyist interest in advanced radar technology.

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