muhammed amar slik
Published

Turn On and Off LED by LDR (Toggle LDR)

This example demonstrates how to use LDR as a switch; each time you cover the LDR, the LED is turned on (if it's off), and off (if it's on).

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Turn On and Off LED by LDR (Toggle LDR)

Things used in this project

Hardware components

Arduino UNO
Arduino UNO
×1
Photo resistor
Photo resistor
×1
Resistor 10k ohm
Resistor 10k ohm
×1
Resistor 221 ohm
Resistor 221 ohm
×1
LED (generic)
LED (generic)
×1
Jumper wires (generic)
Jumper wires (generic)
×1
Breadboard (generic)
Breadboard (generic)
×1

Story

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Schematics

Toggle LDR

Code

Toggle LDR

Arduino
const int lamp = 7;
boolean x = true;
.
void setup() {
  Serial.begin(9600);
  pinMode(lamp , OUTPUT);

}

void loop() {
  int c = analogRead(A0);
  delay(500);
if ( c<300 && x == true){
  digitalWrite(7,HIGH);
   x = false;
   delay(1000);

}
else if ( c <300 && x == false){
x = true;
digitalWrite(7,LOW);
delay(1000);
}
}

Credits

muhammed amar slik
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  • Arduino