Interfacing Arduino uno with LDR

1// Interfacing Arduino uno with LDR sensor
2
3const int ledPin = 5;  // digital pin 5 
4const int ldrPin = A0; // analog pin 0
5
6void setup()  { //  Void setup function will only run once, after each powerup or reset of the  Arduino board.
7
8Serial.begin(9600);
9
10pinMode(ledPin, OUTPUT); // Here  LED is determined as an ouput or an indicator.
11
12pinMode(ldrPin, INPUT); //  Here LDR sensor is determined as input.
13
14}
15
16void loop() { // Void loop  is ran again and again and contains main code.
17
18int ldrStatus = analogRead(ldrPin);
19
20if  (ldrStatus <= 200) {
21
22digitalWrite(ledPin, HIGH); // If LDR senses darkness  led pin high that means led will glow.
23
24Serial.print("Darkness over here,turn  on the LED : ");
25
26Serial.println(ldrStatus);
27
28} else {
29
30digitalWrite(ledPin,  LOW); // If LDR senses light led pin low that means led will stop glowing.
31
32Serial.print("There  is sufficeint light , turn off the LED : ");
33
34Serial.println(ldrStatus);
35
36}
37
38}
39