RVS 115 W Backup Sensor System (Waterproof) Rear View Safety With just 4 pins (VCC, GND, Trig, Echo), the HC SR04 ultrasonic sensor lets Arduino measure distance like a mini sonar. From wiring to code, it's simple, fun, and super useful for T Echo Plus LILYGO Factory Firmware 868MHz Black Echo Wireless Vibration System
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