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![Part Bug] HC-SR04 Ultrasonic Sensor - False Connection - bugs - fritzing forum](https://forum.fritzing.org/uploads/default/original/2X/8/8dcb67d1bcfc039c777a95168a5f5602efcb88a8.png "Part Bug] HC-SR04 Ultrasonic Sensor - False Connection - bugs - fritzing forum")
Part Bug] HC-SR04 Ultrasonic Sensor - False Connection - bugs - fritzing forum
How to use Ultrasonic Sensor's trig pin, and why it is needed? - Arduino Stack Exchange
