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The HC-SR04 Ultrasonic Module has 4 pins, Ground, VCC, Trig and Echo. The Ground and the VCC pins of the module needs to be connected to the Ground and the 5 volts pins on the Arduino Board respectively and the trig and echo pins to any Digital I/O pin on the Arduino Board.
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Geekcreit® ATmega328P Nano V3 Controller Board Compatible Arduino Improved Version Ultrasonic Module HC-SR04 Distance Measuring Ranging Transducer Sensor |