/*

Voltaat learn (http://learn.voltaat.com)

Link for full tutorial:

Tutorial: Arduino Automatic Night Street Lights!

The purpose of this sketch is to make the Arduino control the lighting of the lamp,

so that if the LDR sensor is placed in the dark,the led will light up, while if the

sensor is placed in light, the led will turn off.

Connections from the Arduino to the breadboard:

• Arduino GND pin → Breadboard ground line

• Arduino 5V pin → Breadboard 5V line

Connections from the LDR:

• First pin → Breadboard 5V line

• Second pin → 10KΩ resistor → Breadboard ground line

• Common pin between LDR and the 10KΩ resistor → Arduino pin A0

Connections from the LED :

• LED anode pin → Arduino pin 2

• LED cathode pin → 330 ohm resistor first pin → Breadboard ground line

*/

#define relay 10

int LED = 2;

int LDR = A0;

void setup()

{

Serial.begin(9600);

pinMode(LED, OUTPUT);

pinMode(relay, OUTPUT);

pinMode(LDR, INPUT);

}

void loop() {

int LDRValue = analogRead(LDR);

Serial.print("sensor = ");

Serial.print(LDRValue);

if (LDRValue <=700)

{

digitalWrite(LED, HIGH);

digitalWrite(relay, HIGH);

Serial.println("It's Dark Outside; Lights status: ON");

}

else

{

digitalWrite(LED, LOW);

digitalWrite(relay, LOW);

Serial.println("It's Bright Outside; Lights status: OFF");

}

}

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