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Adafruit (3942 HC-SR04 Ultrasonic Sonar Distance Sensor + 2 x 10K resistors
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HC-SR04 HC-SR04P Ultrasonic Module Distance Measuring Sonar Sensor Module for Arduino: Amazon.com: Industrial & Scientific
Electronic Components 2PCS HC-SR04P Ultrasonic Sonar Sensor Probe Ultrasound Measuring Distance 3-5.5V
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