Amazon.com: JESSINIE 2Pcs JSN-SR04T Ultrasonic Distance Measuring Module JSN-SR04T-V3.0 21~600CM 3mm High Precision Ultrasonic Distance Measure with Waterproof Sensor for Arduino : Industrial & Scientific
Amazon.com: TFmini-i Lidar Sensor 0.1-12m Measurement Range Distance Single-Point Ranging Finder Module Compatible with Pixhawk,Arduino and Raspberry Pi for Drone/Robot Obstacle Avoidance(CAN Version) : Home & Kitchen