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Arduino & IoT Academy · Lesson

Trigger & Echo Wiring

Connect the sensor's two control pins.

Four Little Pins

The HC-SR04 has four pins in a row: VCC, Trig, Echo, and GND. Get these connected correctly and the sensor just works.

Power It Up

Connect VCC to the Arduino 5V pin. This sensor needs a full 5 volts to charge up and fire its sound pulses properly.

All lessons in this course

  1. How Ultrasonic Ranging Works
  2. Trigger & Echo Wiring
  3. pulseIn to Time the Echo
  4. Build a Proximity Alarm
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