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- int LDR = 0; //analog pin to which LDR is connected, here we set it to 0 so it means A0
- int LDRValue = 0; //that’s a variable to store LDR values
- int light_sensitivity = 500; //This is the approx value of light surrounding your LDR
- void setup()
- {
- Serial.begin(9600); //start the serial monitor with 9600 buad
- pinMode(13, OUTPUT); //we mostly use 13 because there is already a built in yellow LED in arduino which shows output when 13 pin is enabled
- }
- void loop()
- {
- LDRValue = analogRead(LDR); //reads the ldr’s value through LDR
- Serial.println(LDRValue); //prints the LDR values to serial monitor
- delay(50); //This is the speed by which LDR sends value to arduino
- if (LDRValue < light_sensitivity)
- {
- digitalWrite(13, HIGH);
- digitalWrite(9, HIGH); //Relæ 1
- }
- else
- {
- digitalWrite(13, LOW);
- digitalWrite(9, LOW); //Relæ 1
- }
- }
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