Hello,
I'm trying to add a Library for Ultrasonic Sensor HC-SR04 for Arduino. I have followed the instructions given in link below, but still no luck.
Regards
Hassee.
/**
* HC-SR04 Demo
* Demonstration of the HC-SR04 Ultrasonic Sensor
* Date: August 3, 2016
*
* Description:
* Connect the ultrasonic sensor to the Arduino as per the
* hardware connections below. Run the sketch and open a serial
* monitor. The distance read from the sensor will be displayed
* in centimeters and inches.
*
* Hardware Connections:
* Arduino | HC-SR04
* -------------------
* 5V | VCC
* 7 | Trig
* 8 | Echo
* GND | GND
*
* License:
* Public Domain
*/
// Pins
const int TRIG_PIN = 7;
const int ECHO_PIN = 8;
// Anything over 400 cm (23200 us pulse) is "out of range"
const unsigned int MAX_DIST = 23200;
void setup() {
// The Trigger pin will tell the sensor to range find
pinMode(TRIG_PIN, OUTPUT);
digitalWrite(TRIG_PIN, LOW);
// We'll use the serial monitor to view the sensor output
Serial.begin(9600);
}
void loop() {
unsigned long t1;
unsigned long t2;
unsigned long pulse_width;
float cm;
float inches;
// Hold the trigger pin high for at least 10 us
digitalWrite(TRIG_PIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIG_PIN, LOW);
// Wait for pulse on echo pin
while ( digitalRead(ECHO_PIN) == 0 );
// Measure how long the echo pin was held high (pulse width)
// Note: the micros() counter will overflow after ~70 min
t1 = micros();
while ( digitalRead(ECHO_PIN) == 1);
t2 = micros();
pulse_width = t2 - t1;
// Calculate distance in centimeters and inches. The constants
// are found in the datasheet, and calculated from the assumed speed
//of sound in air at sea level (~340 m/s).
cm = pulse_width / 58.0;
inches = pulse_width / 148.0;
// Print out results
if ( pulse_width > MAX_DIST ) {
Serial.println("Out of range");
} else {
Serial.print(cm);
Serial.print(" cm \t");
Serial.print(inches);
Serial.println(" in");
}
// Wait at least 60ms before next measurement
delay(60);
}