Project Objective
To automatically turn ON the light at night and turn OFF during daytime using an LDR sensor and Arduino Uno.
Components Required (Part Name)
No. Component Name
1 Arduino Uno
2 LDR (Light Dependent Resistor)
3 10kΩ Resistor
4 LED
5 220Ω Resistor
6 Breadboard
7 Jumper Wires
8 USB Cable
🔌 Circuit Connections
LDR Connection
One leg of LDR → 5V
Other leg of LDR → A0 (Arduino)
10kΩ resistor from A0 → GND
LED Connection
LED Anode (+) → Digital Pin 9 (via 220Ω resistor)
LED Cathode (–) → GND
Working Principle
LDR resistance changes with light.
Daylight → High light → LED OFF
Night → Low light → LED ON
Arduino reads LDR value from analog pin A0 and controls LED.
Arduino Code (Full & Simple)
int ldrPin = A0; // LDR connected to A0
int ledPin = 9; // LED connected to D9
int ldrValue = 0;
void setup() {
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
}
void loop() {
ldrValue = analogRead(ldrPin);
Serial.println(ldrValue);
if (ldrValue < 500) { // Night condition
digitalWrite(ledPin, HIGH);
} else { // Day condition
digitalWrite(ledPin, LOW);
}
delay(500);
}
Applications
Street lights
Garden lights
Automatic room lighting
Energy saving systems
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