Turn On & Off of LED with Photoresistor

Do you want to turn more Leds then the Room is getting darker and darker with Photoresistor, then this is for you

Aug 3, 2021

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photoresistor with led

led with photoresistor

project with photoresistor

photoresistor sensor projects

easy projects with photoresist

Devices & Components

Arduino Uno Rev3

Resistor 220 ohm

Photo resistor

LED (generic)

Resistor 10k ohm

Software & Tools

Arduino IDE

Project description

Code

The Code

c_cpp

1#include <EEPROM.h>
2const int ldrsen = A0;
3int Led = 13;
4int   value = 0;
5int LedPin2 = 12;
6int LedPin3 = 11;
7int LedPin4 = 10;
8//
9void   setup() {
10  delay(2000);
11  Serial.begin(9600);
12  pinMode(LedPin2, OUTPUT);
13   pinMode(LedPin3, OUTPUT);
14  pinMode(LedPin4, OUTPUT);
15  pinMode(Led, OUTPUT);   
16  pinMode(ldrsen, INPUT);
17  
18  // Starting the TEST
19  
20  Serial.println("======Starting   the Test======");
21  Serial.println("You should see the Led blinking every 2   sec");
22  digitalWrite(Led, HIGH);
23  delay(200);
24  digitalWrite(Led, LOW);
25   delay(200);
26  digitalWrite(LedPin2, HIGH);
27  delay(200);
28  digitalWrite(LedPin2,   LOW);
29  delay(200);
30  digitalWrite(LedPin3, HIGH);
31  delay(200);
32  digitalWrite(LedPin3,   LOW);
33  delay(200);
34  digitalWrite(LedPin4, HIGH);
35  delay(200);
36  digitalWrite(LedPin4,   LOW);
37  delay(200);
38  Serial.println("Test 1 is completed");
39  Serial.println("Now   testing the Photoresistor, Make sure it is connected to the Pin A0");
40  delay(2000);
41   Serial.println("Starting the test now!");   
42   
43   rerun:
44  value   = analogRead(ldrsen) /4;
45  
46  if(value >1){
47    Serial.print("The Photoresistor   is connected and here are some value: ");
48    delay(200);
49    Serial.println(value);   
50    delay(200);
51    Serial.println(value); 
52    delay(200); 
53    Serial.println(value);     
54  }
55    else{
56      value = analogRead(ldrsen)/4 ;
57        if(value<0)
58           Serial.println("Hmm the Photoresistor is not connected");
59          Serial.println("Retrying   in 5s");
60          delay(5000);
61          goto rerun;
62        }
63          Serial.println("======END======");
64}
65
66
67   //*************************LOOP*******************
68
69
70 
71void loop() {
72   value = analogRead(ldrsen)/4;
73  delay(100);
74    if(value < 50){
75    digitalWrite(Led,   HIGH);
76  }
77  else
78  {
79    digitalWrite(Led, LOW);
80  }
81  //Led2
82   if(value < 70){
83    digitalWrite(LedPin2, HIGH);
84  }
85  else
86  {
87     digitalWrite(LedPin2, LOW);
88  }
89  if(value < 150){
90    digitalWrite(LedPin3,   HIGH);
91  }
92  else
93  {
94    digitalWrite(LedPin3, LOW);
95  }
96  if(value   < 200){
97    digitalWrite(LedPin4, HIGH);
98  }
99  else
100  {
101    digitalWrite(LedPin4,   LOW);
102  }
103}

#include <EEPROM.h>
const int ldrsen = A0;
int Led = 13;
int   value = 0;
int LedPin2 = 12;
int LedPin3 = 11;
int LedPin4 = 10;
//
void   setup() {
  delay(2000);
  Serial.begin(9600);
  pinMode(LedPin2, OUTPUT);
   pinMode(LedPin3, OUTPUT);
  pinMode(LedPin4, OUTPUT);
  pinMode(Led, OUTPUT);   
  pinMode(ldrsen, INPUT);
  
  // Starting the TEST
  
  Serial.println("======Starting   the Test======");
  Serial.println("You should see the Led blinking every 2   sec");
  digitalWrite(Led, HIGH);
  delay(200);
  digitalWrite(Led, LOW);
   delay(200);
  digitalWrite(LedPin2, HIGH);
  delay(200);
  digitalWrite(LedPin2,   LOW);
  delay(200);
  digitalWrite(LedPin3, HIGH);
  delay(200);
  digitalWrite(LedPin3,   LOW);
  delay(200);
  digitalWrite(LedPin4, HIGH);
  delay(200);
  digitalWrite(LedPin4,   LOW);
  delay(200);
  Serial.println("Test 1 is completed");
  Serial.println("Now   testing the Photoresistor, Make sure it is connected to the Pin A0");
  delay(2000);
   Serial.println("Starting the test now!");   
   
   rerun:
  value   = analogRead(ldrsen) /4;
  
  if(value >1){
    Serial.print("The Photoresistor   is connected and here are some value: ");
    delay(200);
    Serial.println(value);   
    delay(200);
    Serial.println(value); 
    delay(200); 
    Serial.println(value);     
  }
    else{
      value = analogRead(ldrsen)/4 ;
        if(value<0)
           Serial.println("Hmm the Photoresistor is not connected");
          Serial.println("Retrying   in 5s");
          delay(5000);
          goto rerun;
        }
          Serial.println("======END======");
}


   //*************************LOOP*******************


 
void loop() {
   value = analogRead(ldrsen)/4;
  delay(100);
    if(value < 50){
    digitalWrite(Led,   HIGH);
  }
  else
  {
    digitalWrite(Led, LOW);
  }
  //Led2
   if(value < 70){
    digitalWrite(LedPin2, HIGH);
  }
  else
  {
     digitalWrite(LedPin2, LOW);
  }
  if(value < 150){
    digitalWrite(LedPin3,   HIGH);
  }
  else
  {
    digitalWrite(LedPin3, LOW);
  }
  if(value   < 200){
    digitalWrite(LedPin4, HIGH);
  }
  else
  {
    digitalWrite(LedPin4,   LOW);
  }
}

The Code

c_cpp

1#include <EEPROM.h>
2const int ldrsen = A0;
3int Led = 13;
4int  value = 0;
5int LedPin2 = 12;
6int LedPin3 = 11;
7int LedPin4 = 10;
8//
9void  setup() {
10  delay(2000);
11  Serial.begin(9600);
12  pinMode(LedPin2, OUTPUT);
13  pinMode(LedPin3, OUTPUT);
14  pinMode(LedPin4, OUTPUT);
15  pinMode(Led, OUTPUT);  
16  pinMode(ldrsen, INPUT);
17  
18  // Starting the TEST
19  
20  Serial.println("======Starting  the Test======");
21  Serial.println("You should see the Led blinking every 2  sec");
22  digitalWrite(Led, HIGH);
23  delay(200);
24  digitalWrite(Led, LOW);
25  delay(200);
26  digitalWrite(LedPin2, HIGH);
27  delay(200);
28  digitalWrite(LedPin2,  LOW);
29  delay(200);
30  digitalWrite(LedPin3, HIGH);
31  delay(200);
32  digitalWrite(LedPin3,  LOW);
33  delay(200);
34  digitalWrite(LedPin4, HIGH);
35  delay(200);
36  digitalWrite(LedPin4,  LOW);
37  delay(200);
38  Serial.println("Test 1 is completed");
39  Serial.println("Now  testing the Photoresistor, Make sure it is connected to the Pin A0");
40  delay(2000);
41  Serial.println("Starting the test now!");   
42   
43   rerun:
44  value  = analogRead(ldrsen) /4;
45  
46  if(value >1){
47    Serial.print("The Photoresistor  is connected and here are some value: ");
48    delay(200);
49    Serial.println(value);  
50    delay(200);
51    Serial.println(value); 
52    delay(200); 
53    Serial.println(value);    
54  }
55    else{
56      value = analogRead(ldrsen)/4 ;
57        if(value<0)
58          Serial.println("Hmm the Photoresistor is not connected");
59          Serial.println("Retrying  in 5s");
60          delay(5000);
61          goto rerun;
62        }
63          Serial.println("======END======");
64}
65
66
67  //*************************LOOP*******************
68
69
70 
71void loop() {
72  value = analogRead(ldrsen)/4;
73  delay(100);
74    if(value < 50){
75    digitalWrite(Led,  HIGH);
76  }
77  else
78  {
79    digitalWrite(Led, LOW);
80  }
81  //Led2
82  if(value < 70){
83    digitalWrite(LedPin2, HIGH);
84  }
85  else
86  {
87    digitalWrite(LedPin2, LOW);
88  }
89  if(value < 150){
90    digitalWrite(LedPin3,  HIGH);
91  }
92  else
93  {
94    digitalWrite(LedPin3, LOW);
95  }
96  if(value  < 200){
97    digitalWrite(LedPin4, HIGH);
98  }
99  else
100  {
101    digitalWrite(LedPin4,  LOW);
102  }
103}

#include <EEPROM.h>
const int ldrsen = A0;
int Led = 13;
int  value = 0;
int LedPin2 = 12;
int LedPin3 = 11;
int LedPin4 = 10;
//
void  setup() {
  delay(2000);
  Serial.begin(9600);
  pinMode(LedPin2, OUTPUT);
  pinMode(LedPin3, OUTPUT);
  pinMode(LedPin4, OUTPUT);
  pinMode(Led, OUTPUT);  
  pinMode(ldrsen, INPUT);
  
  // Starting the TEST
  
  Serial.println("======Starting  the Test======");
  Serial.println("You should see the Led blinking every 2  sec");
  digitalWrite(Led, HIGH);
  delay(200);
  digitalWrite(Led, LOW);
  delay(200);
  digitalWrite(LedPin2, HIGH);
  delay(200);
  digitalWrite(LedPin2,  LOW);
  delay(200);
  digitalWrite(LedPin3, HIGH);
  delay(200);
  digitalWrite(LedPin3,  LOW);
  delay(200);
  digitalWrite(LedPin4, HIGH);
  delay(200);
  digitalWrite(LedPin4,  LOW);
  delay(200);
  Serial.println("Test 1 is completed");
  Serial.println("Now  testing the Photoresistor, Make sure it is connected to the Pin A0");
  delay(2000);
  Serial.println("Starting the test now!");   
   
   rerun:
  value  = analogRead(ldrsen) /4;
  
  if(value >1){
    Serial.print("The Photoresistor  is connected and here are some value: ");
    delay(200);
    Serial.println(value);  
    delay(200);
    Serial.println(value); 
    delay(200); 
    Serial.println(value);    
  }
    else{
      value = analogRead(ldrsen)/4 ;
        if(value<0)
          Serial.println("Hmm the Photoresistor is not connected");
          Serial.println("Retrying  in 5s");
          delay(5000);
          goto rerun;
        }
          Serial.println("======END======");
}


  //*************************LOOP*******************


 
void loop() {
  value = analogRead(ldrsen)/4;
  delay(100);
    if(value < 50){
    digitalWrite(Led,  HIGH);
  }
  else
  {
    digitalWrite(Led, LOW);
  }
  //Led2
  if(value < 70){
    digitalWrite(LedPin2, HIGH);
  }
  else
  {
    digitalWrite(LedPin2, LOW);
  }
  if(value < 150){
    digitalWrite(LedPin3,  HIGH);
  }
  else
  {
    digitalWrite(LedPin3, LOW);
  }
  if(value  < 200){
    digitalWrite(LedPin4, HIGH);
  }
  else
  {
    digitalWrite(LedPin4,  LOW);
  }
}

Downloadable files

shiny_luulia_37bHdyCXxd.brd

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