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HC-SR04 Ultrasonic Distance Sensor library for Arduino

This is a HC-SR04 I2C RTC library for Arduino.

Library features

• Measure distance between 3cm .. 400cm or 1.18" .. 157.48"
• Accuracy around +/-1cm
• Optimized pin control for AVR

Hardware

Arduino UNO

• TRIG pin to Arduino Uno pin 2
• ECHO pin to Arduino Uno pin 3
• VCC pin to Arduino Uno pin VCC
• GND pin to Arduino Uno pin GND

Examples

Arduino IDE | Examples | Erriez HC-SR04:

• HC-SR04 Centimeter
• HC-SR04 Inch

Documentation

• Doxygen online HTML
• Doxygen PDF
• Datsheet

Example

#include <ErriezHCSR04.h>

// Pin defines
#define TRIG_PIN    2
#define ECHO_PIN    3

// Create sensor object
ErriezHCSR04 hcsr04(TRIG_PIN, ECHO_PIN);


void setup()
{
    // Initialize serial port
    delay(500);
    Serial.begin(115200);
    while (!Serial) {
        ;
    }
    Serial.println(F("\nErriez HC-SR04 ultrasonic distance sensor example\n"));

    // Initialize pins
    hcsr04.begin();
}

void loop()
{
    int16_t distance;

    // Measure distance in centimeter
    distance = hcsr04.getDistance();

    // Print distance
    Serial.print(F("Distance: "));
    if (distance >= 0) {
        Serial.print(distance);
        Serial.println(F(" cm"));
    } else {
        Serial.println(F("-"));
    }

    // Wait
    delay(250);
}

Measure distance in Inches

void loop()
{
    float distance;

    // Measure distance in Inch
    distance = hcsr04.getDistanceInch();

    // Print distance
    Serial.print(F("Distance: "));
    if (distance >= 0) {
        Serial.print(distance);
        Serial.println(F("\""));
    } else {
        Serial.println(("-"));
    }

    // Wait
    delay(250);
}

Library dependencies

• None

Library installation

Please refer to the Wiki page.

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