Objective :

to learn ultrasonic sensor and programing for automatic LED on-off

INTRODUCTION:

Ultrasonic Sensor:

  • An ultrasonic sensor is an electronic device that measures the distance of target object by emitting ultrasonic sound wave and convert the reflected sound into an electrical signal
  • Ultrasonic wave travelled faster than the audible sound that’s why human ear can not able hear this sound.
  • Range of Ultrasonic Wave – 40 to 70 kHz range.
  • Frequency range of audible sound – above 20 Hz to 20 kHz.
PIN DISCRIPTION OF ULTRASONIC SENSOR

Task 03: Automatic LED ON/ OFF using Ultrasonic Sensor

Task to ON/OFF LED using Ultrasonic Sensor

Equipment’s:

  • Arduino UNO(1)
  • Ultrasonic Sensor (HC-SC04)
  • Bread Board(1)
  • LED (1)
  • Resistor 220 ohm (1)
  • Jumping Wires

Software Used:

  1. Arduino Uno
  2. Tinker CAD

Connection:

Connection For Ultrasonic Sensor

Sketch :

#define trigPin 13

#define echoPin 12

#define led 11

void setup()

{ Serial.begin (9600);

pinMode(trigPin, OUTPUT);

pinMode(echoPin, INPUT);

pinMode(led, OUTPUT);

}

void loop()

{ long duration, distance;

digitalWrite(trigPin, LOW);

delayMicroseconds(2);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);

distance = (duration/2) / 29.1;

if (distance < 10)

{ digitalWrite(led,HIGH);

}

else {

digitalWrite(led,LOW);

}

Serial.print(distance);

Serial.println(” cm”);

delay(500);

}

After the Completing this Task, I Work on Implementation of Automatic Light ON/OFF System.

Refer the link given below for implementation:

वीज बचतीसाठी स्वयंचलित प्रकाश व्यवस्था.
Testing a kit
Implement the Kit

Application:

Automatic Light ON/OFF system can be used to:

  • Lift light
  • kitchen light
  • Bathroom light
  • Dark Rooms ,etc.