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CQRobot Ocean: 10.525GHz Doppler Effect Microwave Motion Sensor Compatible with Raspberry Pi and Arduino Board. for Industrial, Measurement, Automatic Doors, Sensor Lights, Reversing Radar, etc. : Amazon.it: Casa e cucina
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181 DIY Radar Speed Gun using cheap Radar Sensors (HB100, CDM324) for Arduino, ESP8266 and ESP32 - YouTube
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