Smart Light using LDR, Relay & Arduino Uno

1int sensorPin = A0;
2int relayPin = 8;
3
4void setup() 
5{
6
7  Serial.begin(9600);
8  pinMode(sensorPin, INPUT);
9  pinMode(relayPin, OUTPUT);
10}
11void
12  loop() 
13{
14  int sensorValue = analogRead(sensorPin);
15  if( sensorValue
16  <= 25 )  // Change the value as per your requirement
17  {
18    digitalWrite(relayPin,
19  LOW);
20    Serial.println(sensorValue);
21    delay(100);
22  }
23  else
24
25  {
26    digitalWrite(relayPin, HIGH);
27    Serial.println(sensorValue);
28
29  }
30}
31

1int sensorPin = A0;
2int relayPin = 8;
3
4void setup() 
5{
6  Serial.begin(9600);
7  pinMode(sensorPin, INPUT);
8  pinMode(relayPin, OUTPUT);
9}
10void  loop() 
11{
12  int sensorValue = analogRead(sensorPin);
13  if( sensorValue  <= 25 )  // Change the value as per your requirement
14  {
15    digitalWrite(relayPin,  LOW);
16    Serial.println(sensorValue);
17    delay(100);
18  }
19  else
20  {
21    digitalWrite(relayPin, HIGH);
22    Serial.println(sensorValue);
23  }
24}
25