(Programming code) Smart study table

// Eip Tech

// Code by Shriyansh namdeo

// www.youtube.com/c/eiptech

#define trigPin 3

#define echoPin 2

#define relay 4

void setup()

{

pinMode(trigPin, OUTPUT);

pinMode(echoPin, INPUT);

pinMode(relay, 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;

delay(2000);
     
if (distance < 130)     // This is where checking the distance you can change the value

{

// When the the distance below 100cm
               
digitalWrite(relay,HIGH);

} else

{

// when greater than 100cm

digitalWrite(relay,LOW);

} delay(30);

}