Arduino Tutorial - Controlling LEDS with LDR Sensor

How to control LEDS with LDR sensor.

Mar 31, 2020

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Devices & Components

Arduino Uno Rev3

Resistor 220 ohm

Jumper wires (generic)

LDR, 5 Mohm

Breadboard (generic)

Resistor 10k ohm

LED (generic)

Hardware & Tools

Plier, Needle Nose

Software & Tools

Arduino IDE

Project description

Code

The code

arduino

1/*
2   Roy Ben Avraham
3   Last modification: 31/3/2020
4   Project:   Controlling LEDS with LDR sensor
5*/
6
7// variables ( You can change the   pins as you wish)
8const int ldrPin = A0;    
9const int ledPin1 = 12; 
10const   int ledPin2 = 11; 
11const int ledPin3 = 10; 
12const int ledPin4 = 9; 
13
14int   ldrValue = 0;
15int ldrlevel1=600; 
16int ldrlevel2=700; 
17int ldrlevel3=750;   
18int ldrlevel4=800;
19
20void setup() {
21  Serial.begin(9600);    
22  pinMode(ledPin1,   OUTPUT);
23  pinMode(ledPin2, OUTPUT);
24  pinMode(ledPin3, OUTPUT);
25  pinMode(ledPin4,   OUTPUT);
26}
27
28void loop() {
29  ldrValue = analogRead(ldrPin); 
30  Serial.println(ldrValue);
31   if (ldrValue < ldrlevel1) {
32    digitalWrite(ledPin4, HIGH);
33  }
34  else   if (ldrValue < ldrlevel2) {
35    digitalWrite(ledPin4, LOW);
36    digitalWrite(ledPin3,   HIGH);
37  }
38  else if (ldrValue < ldrlevel3) {
39    digitalWrite(ledPin3,   LOW);
40    digitalWrite(ledPin2, HIGH);
41  }
42  else if (ldrValue < ldrlevel4)   {
43    digitalWrite(ledPin2, LOW);
44    digitalWrite(ledPin1, HIGH);
45  }
46   else {
47    digitalWrite(ledPin1, LOW);
48      }
49   }
50

/*
   Roy Ben Avraham
   Last modification: 31/3/2020
   Project:   Controlling LEDS with LDR sensor
*/

// variables ( You can change the   pins as you wish)
const int ldrPin = A0;    
const int ledPin1 = 12; 
const   int ledPin2 = 11; 
const int ledPin3 = 10; 
const int ledPin4 = 9; 

int   ldrValue = 0;
int ldrlevel1=600; 
int ldrlevel2=700; 
int ldrlevel3=750;   
int ldrlevel4=800;

void setup() {
  Serial.begin(9600);    
  pinMode(ledPin1,   OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
  pinMode(ledPin4,   OUTPUT);
}

void loop() {
  ldrValue = analogRead(ldrPin); 
  Serial.println(ldrValue);
   if (ldrValue < ldrlevel1) {
    digitalWrite(ledPin4, HIGH);
  }
  else   if (ldrValue < ldrlevel2) {
    digitalWrite(ledPin4, LOW);
    digitalWrite(ledPin3,   HIGH);
  }
  else if (ldrValue < ldrlevel3) {
    digitalWrite(ledPin3,   LOW);
    digitalWrite(ledPin2, HIGH);
  }
  else if (ldrValue < ldrlevel4)   {
    digitalWrite(ledPin2, LOW);
    digitalWrite(ledPin1, HIGH);
  }
   else {
    digitalWrite(ledPin1, LOW);
      }
   }

The code

arduino

1/*
2   Roy Ben Avraham
3   Last modification: 31/3/2020
4   Project:  Controlling LEDS with LDR sensor
5*/
6
7// variables ( You can change the  pins as you wish)
8const int ldrPin = A0;    
9const int ledPin1 = 12; 
10const  int ledPin2 = 11; 
11const int ledPin3 = 10; 
12const int ledPin4 = 9; 
13
14int  ldrValue = 0;
15int ldrlevel1=600; 
16int ldrlevel2=700; 
17int ldrlevel3=750;  
18int ldrlevel4=800;
19
20void setup() {
21  Serial.begin(9600);    
22  pinMode(ledPin1,  OUTPUT);
23  pinMode(ledPin2, OUTPUT);
24  pinMode(ledPin3, OUTPUT);
25  pinMode(ledPin4,  OUTPUT);
26}
27
28void loop() {
29  ldrValue = analogRead(ldrPin); 
30  Serial.println(ldrValue);
31  if (ldrValue < ldrlevel1) {
32    digitalWrite(ledPin4, HIGH);
33  }
34  else  if (ldrValue < ldrlevel2) {
35    digitalWrite(ledPin4, LOW);
36    digitalWrite(ledPin3,  HIGH);
37  }
38  else if (ldrValue < ldrlevel3) {
39    digitalWrite(ledPin3,  LOW);
40    digitalWrite(ledPin2, HIGH);
41  }
42  else if (ldrValue < ldrlevel4)  {
43    digitalWrite(ledPin2, LOW);
44    digitalWrite(ledPin1, HIGH);
45  }
46  else {
47    digitalWrite(ledPin1, LOW);
48      }
49   }
50

/*
   Roy Ben Avraham
   Last modification: 31/3/2020
   Project:  Controlling LEDS with LDR sensor
*/

// variables ( You can change the  pins as you wish)
const int ldrPin = A0;    
const int ledPin1 = 12; 
const  int ledPin2 = 11; 
const int ledPin3 = 10; 
const int ledPin4 = 9; 

int  ldrValue = 0;
int ldrlevel1=600; 
int ldrlevel2=700; 
int ldrlevel3=750;  
int ldrlevel4=800;

void setup() {
  Serial.begin(9600);    
  pinMode(ledPin1,  OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
  pinMode(ledPin4,  OUTPUT);
}

void loop() {
  ldrValue = analogRead(ldrPin); 
  Serial.println(ldrValue);
  if (ldrValue < ldrlevel1) {
    digitalWrite(ledPin4, HIGH);
  }
  else  if (ldrValue < ldrlevel2) {
    digitalWrite(ledPin4, LOW);
    digitalWrite(ledPin3,  HIGH);
  }
  else if (ldrValue < ldrlevel3) {
    digitalWrite(ledPin3,  LOW);
    digitalWrite(ledPin2, HIGH);
  }
  else if (ldrValue < ldrlevel4)  {
    digitalWrite(ledPin2, LOW);
    digitalWrite(ledPin1, HIGH);
  }
  else {
    digitalWrite(ledPin1, LOW);
      }
   }

Downloadable files

Diagram

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