Arduino with darkness Sensor and LED (Code)

Arduino with darkness Sensor and LED

Today we shall learn to use a LDR with arduino.
The required kits are :

1. An arduino and its adapter
2. Few jumper Wires
3. LDR with 10k OHM resistor
4. A LED with 220 OHM resistor
5. A breadboard

There are two legs on a LED. The longer leg is positive and the shorter leg is negative. LDR has too legs, too. The steps to setup hardware are listed below:

• Fix the LED on the breadboard.
• Connect longer LED leg to pin 12 on the arduino.
• Connect shorter LED leg to GND pin on the breadboard through a 220 ohm resistor.
• Connect 5V pin on the arduino to +VE on the breadboard .
• Connect GND pin on the arduino to -VE on the breadboard .

Watch the video to learn to set up the LDR. The setup is complete. Now, upload the code and enjoy.

Check out the tutorial

(Code)

const int ledpin=12;
const int ldrpin=A2;
int darknesssensvalue=0;
int threshold=500;
void setup() {
Serial.begin(9600);
// put your setup code here, to run once:
pinMode(ledpin,OUTPUT);
pinMode(ldrpin,INPUT);
}
void loop() {
darknesssensvalue=analogRead(ldrpin);
if (darknesssensvalue<=threshold) {
digitalWrite(ledpin,HIGH);
delay(100);
digitalWrite(ledpin,LOW) ;
delay(100);
}
else {
digitalWrite(ledpin,LOW);
}
}