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Paradisetronic.com Ultrasonic sensor HC-SR04 with bracket, distance measurement up to 3m, for e.g. Arduino, Raspberry Pi
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TFmini-S Lidar Sensor 0.1-12m Distance Measurement Single-Point Ranging Module Compatible with Pixhawk and Raspberry Pi for Drone/Motion Detection/Robot : Amazon.co.uk: DIY & Tools
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Android Things Basics: Measure distance with Ultrasonic sensor | by Daniel Dallos | HackerNoon.com | Medium
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