03 Distance light intensity control

In this circuit, the proximity sensor acts as a regulator for LED bulb. Here -

If an object is less than 5cm distance from the sensor, the LED will glow with full intensity
If an object is between 5cm to 30cm distance from the sensor, LED will change intensity based on distance
If there is no object within 30cm from sensor, LED will turn off.

Circuit diagram

(credits: https://www.circuito.io/)

Here, you can connect resistor and LED to board directly without breadboard. If you do not have LED, replace 5 with 13 in the code below which will make the on-board LED blink.

Code

const int trigPin = 3;
const int echoPin = 2;

void setup() {
  pinMode(5, OUTPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  long duration = pulseIn(echoPin, HIGH);
  float distance = duration * 0.034 / 2; // Convert to centimeters
  float bright = 306 - (distance* 10.2 );

  if (distance<5){
    // digitalWrite(7,HIGH);
    analogWrite(5, 255);
  }
  else if (distance >=5 && distance <= 30){
    analogWrite(5, bright);
  }
  else digitalWrite(5,LOW);

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  
  delay(100); 
}

02 Distance light switch ›

Liked what you saw?

get in touch :)

Medium

Behance