Light Sensing

Turn on/off LED using LDR Sensor.

Oct 18, 2020

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Devices & Components

Arduino Uno Rev3

LDR, 5 Mohm

5 mm LED: Red

Resistor 1k ohm

Jumper wires (generic)

Breadboard (generic)

Software & Tools

Arduino IDE

Project description

Code

LDR Sensor Code

arduino

1int ldrPin = A2;
2int ledPin = 11;
3int ldrValue;
4
5void setup()   {
6  Serial.begin(9600);
7  pinMode(ldrPin, INPUT_PULLUP);
8  pinMode(ledPin,   OUTPUT);
9}
10
11void loop() {
12  ldrValue = analogRead(ldrPin);
13
14  if   (ldrValue <= 80) {
15    digitalWrite(ledPin, HIGH);
16  } else {
17    digitalWrite(ledPin,   LOW);
18  }
19}

int ldrPin = A2;
int ledPin = 11;
int ldrValue;

void setup()   {
  Serial.begin(9600);
  pinMode(ldrPin, INPUT_PULLUP);
  pinMode(ledPin,   OUTPUT);
}

void loop() {
  ldrValue = analogRead(ldrPin);

  if   (ldrValue <= 80) {
    digitalWrite(ledPin, HIGH);
  } else {
    digitalWrite(ledPin,   LOW);
  }
}

LDR Sensor Code

arduino

1int ldrPin = A2;
2int ledPin = 11;
3int ldrValue;
4
5void setup()  {
6  Serial.begin(9600);
7  pinMode(ldrPin, INPUT_PULLUP);
8  pinMode(ledPin,  OUTPUT);
9}
10
11void loop() {
12  ldrValue = analogRead(ldrPin);
13
14  if  (ldrValue <= 80) {
15    digitalWrite(ledPin, HIGH);
16  } else {
17    digitalWrite(ledPin,  LOW);
18  }
19}

int ldrPin = A2;
int ledPin = 11;
int ldrValue;

void setup()  {
  Serial.begin(9600);
  pinMode(ldrPin, INPUT_PULLUP);
  pinMode(ledPin,  OUTPUT);
}

void loop() {
  ldrValue = analogRead(ldrPin);

  if  (ldrValue <= 80) {
    digitalWrite(ledPin, HIGH);
  } else {
    digitalWrite(ledPin,  LOW);
  }
}

Downloadable files

Circuit Diagram

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ansh2919

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