This library was created to work with the HC-SR04 Ultrasonic sensor. It features timing, metric conversion (centimeter and inch) and standard deviation methods.

The HC-SR04 ultrasonic sensor uses sonar to determine the distance to an object. This sensor reads from 2cm to 400cm (0.8inch to 157inch) with an accuracy of 0.3cm (0.1inches), which is good for most hobbyist projects. In addition, this particular module comes with ultrasonic transmitter and receiver modules.

1. Download the code
2. Add the folder under Arduino/libraries
3. Restart Arduino IDE

Public functions:

• Ultrasonic(int tp, int ep)

  Contructor, inform the pin number of the trigger (tp) and echo (ep)

• long timing()

  to calculate the timing in microseconds

• float convert(long microsec, int metric)

  to convert the microseconds in IN or CM Use the variables Ultrasonic:IN or Ultrasonic:CM on the metric

• void setDivisor(float value, int metric)

  set new divisor value to the metric in case need to adjust the precision

#include <Ultrasonic.h>

#define TRIGGER_PIN  4
#define ECHO_PIN     5

Ultrasonic ultrasonic(TRIGGER_PIN, ECHO_PIN);

void setup() {
  Serial.begin(9600);
}

void loop() {
  float msecToCM, msecToIN;
  long microsec = ultrasonic.timing();

  msecToCM = ultrasonic.convert(microsec, Ultrasonic::CM);
  msecToIN = ultrasonic.convert(microsec, Ultrasonic::IN);
  Serial.print("MicroSec: ");
  Serial.print(microsec);
  Serial.print(", CM: ");
  Serial.print(msecToCM);
  Serial.print(", IN: ");
  Serial.println(msecToIN);
  delay(1000);
}

Contributions are welcome! Feel free to open an issue or submit a pull request if you have a way to improve this project.

Make sure your request is meaningful and you have tested the app locally before submitting a pull request.

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