Home automation By withour any switch and using sensors

Apparatus required:

                         1x Ultrasonic sensor

                         1x Arduino Atmega328

                         1x Relay

                         1x fan

                               connecting wires As required

Connection/Working:   

Step 1:  Upload the program given below in to Arduino board 

Step 2:  Connect the Arduino and Ultrasonic sensor in to the pins  trigPin-13, echoPin-12

Step 3: Connect relay to Arduino pin 2 and motor to relay

Step 3: Now click serial monitor in the Arduino software 

Step 4:  Move your sensor and find distance approx,

Step 5: Follow us and subscribe our YouTube channel

Program:

/*

 HC-SR04 based cooling fan distance sensor:

 VCC to arduino 5v

 GND to arduino GND

 Echo to Arduino to pin 13

 Trig to Arduino pin 12

 */





#define echoPin 13 // Echo Pin

#define trigPin 12 // Trigger Pin

#define motor 2 // Relay



long duration, distance; // Duration used to calculate distance



void setup() {

 pinMode(trigPin, OUTPUT);

 pinMode(echoPin, INPUT);

 pinMode(motor, OUTPUT); // cooling fan



}



void loop() {

/* The following trigPin/echoPin cycle is used to determine the

 distance of the nearest object by bouncing soundwaves off of it. */

 digitalWrite(trigPin, LOW);

 delayMicroseconds(2);



 digitalWrite(trigPin, HIGH);

 delayMicroseconds(10);



 digitalWrite(trigPin, LOW);

 duration = pulseIn(echoPin, HIGH);



 //Calculate the distance (in cm) based on the speed of fan.

 distance = duration/58.2;



 if (distance <= 50)

 {

 digitalWrite(motor, HIGH);

  delay(50);

 }

 else {

 /* Send the distance to the computer using Serial protocol, and

 turn motor OFF to indicate successful reading. */

 digitalWrite(motor, LOW);

  delay(50);

 }

 //Delay 10ms before next reading.
 delay(10);
}

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