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HC-SR04 Ultrasonic
Sensors

HC-SR04 Ultrasonic

Measures distance with sound pulses.

Definition

Emits a 40 kHz pulse and times the echo to estimate distance from ~2 cm to ~4 m.

AI Application

Provides obstacle data to AI-driven robots and smart parking systems.

Parts & pins

1
VCC

5V power input

2
TRIG

Send 10 µs pulse to start ping

3
ECHO

HIGH while waiting for echo return

4
GND

Ground reference

5
Transmitter (T)

40 kHz ultrasonic emitter

6
Receiver (R)

Picks up the returned echo

Works with

Hardware you can wire this part to in a typical project.

Arduino Uno R3
Arduino Uno R3
Arduino
Arduino Nano
Arduino Nano
Arduino
Arduino Mega 2560
Arduino Mega 2560
Arduino
ESP32 DevKit
ESP32 DevKit
ESP Wi-Fi Boards
ESP8266 NodeMCU
ESP8266 NodeMCU
ESP Wi-Fi Boards

Seminars & reports for this part

HC-SR04: Distance with soundReport
Apr 3, 2025

HC-SR04: Distance with sound

Measure 2 cm to 4 m with a $2 ultrasonic module.