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Ae 1209 Iot Lab 7

The document outlines a program for interfacing an ultrasonic sensor (HC-SR04) with an Arduino to control the blinking of Red, Orange, and Green LEDs based on distance measurements. It includes the program code that sets up the sensor and LEDs, calculates distance, and regulates LED states accordingly. The result demonstrates that the LEDs blink based on the proximity of an object detected by the ultrasonic sensor.

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5 views2 pages

Ae 1209 Iot Lab 7

The document outlines a program for interfacing an ultrasonic sensor (HC-SR04) with an Arduino to control the blinking of Red, Orange, and Green LEDs based on distance measurements. It includes the program code that sets up the sensor and LEDs, calculates distance, and regulates LED states accordingly. The result demonstrates that the LEDs blink based on the proximity of an object detected by the ultrasonic sensor.

Uploaded by

ansh28405
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Ansh Sharma

AE-1209
B.Sc. Computer Science Hons

IOT
GE Electronics (VI Semester)
LAB -7

Program 9 : Interfacing Ultrasonic Sensor (HC-SR04) with Arduino


Regulating blinking of Red, Orange and Green LEDs according to distance

Program Code : -

int trigPin = 2;
int echoPin = 3; // Added echoPin
int LEDR = 5;
int LEDO = 6;
int LEDG = 7;

long duration;
int distance;

void setup() {
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT); //Corrected from the image.
pinMode(LEDR, OUTPUT);
pinMode(LEDO, OUTPUT);
pinMode(LEDG, OUTPUT);
Serial.begin(9600);
}

void loop() {
// Clears the trigPin condition
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
// Sets the trigPin HIGH (ACTIVE) for 10 microseconds
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
// Reads the echoPin, returns the sound wave travel time in
microseconds
duration = pulseIn(echoPin, HIGH);
// Calculating the distance
distance = duration * 0.034 / 2;
// Prints the distance on the Serial Monitor
Serial.print("Distance: ");
Serial.println(distance);

if (distance <= 10) {


digitalWrite(LEDR, HIGH);
digitalWrite(LEDO, LOW);
digitalWrite(LEDG, LOW);
} else if (distance <= 20) {
digitalWrite(LEDR, LOW);
digitalWrite(LEDO, HIGH);
digitalWrite(LEDG, LOW);
} else {
digitalWrite(LEDR, LOW);
digitalWrite(LEDO, LOW);
digitalWrite(LEDG, HIGH);
}
delay(100);
}

Result :-

The LED’s blinks based on the distance between the ultrasonic sensor and the object.

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