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LDR - Light Dependent Resistor


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LDRs or Light Dependent Resistors are very useful especially in light/dark sensor circuits. Normally the resistance of an LDR is very high, sometimes as high as 1000 000 ohms, but when they are illuminated with light resistance drops dramatically.

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0,62 € impuestos inc.



int portaLed = 10; //Port is being used to connect the LED 
int portaLDR = A5; //Analog port used by LDR

void setup()
pinMode(portaLed, OUTPUT); //Sets Led door as output

void loop()
int estado = analogRead(portaLDR); Read the value provided by LDR

// If the value read from the analog port is greater than
// 800, acende o LED
// Set the value below according to your circuit
if (estado > 800)
digitalWrite(portaLed, HIGH);
else //Otherwise, the LED goes out
digitalWrite(portaLed, LOW);


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