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UM30-213112 | Sick Ultrasonic Barrel-Style Proximity Sensor, M30 x 1.5, 200 → 1300 mm Detection, PNP Output, 9 → 30 V | RS
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Amazon.com: AOICRIE 5pcs HC-SR04 Ultrasonic Sensor Distance Module for Nano Robot XBee ZigBee by ElecRight for Ultrasonic Proximity Sensors Motion Detectors (5PCS) : Industrial & Scientific
How to make an ultrasonic proximity sensor with the output as varying sound intensity based on the proximity - Quora
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