Código IDE C9

De Casiopea

/*

* A simple programme that will change the intensity of
* an LED based  * on the amount of light incident on 
* the photo resistor.
* 
*/

//PhotoResistor Pin int lightPin = 0; //the analog pin the photoresistor is

                 //connected to
                 //the photoresistor is not calibrated to any units so
                 //this is simply a raw sensor value (relative light)

//LED Pin int ledPin = 9; //the pin the LED is connected to

                 //we are controlling brightness so 
                 //we use one of the PWM (pulse width
                 // modulation pins)

void setup() {

 pinMode(ledPin, OUTPUT); //sets the led pin to output

}

/*
* loop() - this function will start after setup 
* finishes and then repeat
*/

void loop() {

int lightLevel = analogRead(lightPin); //Read the
                                       // lightlevel
lightLevel = map(lightLevel, 0, 900, 0, 255); 
        //adjust the value 0 to 900 to
        //span 0 to 255


lightLevel = constrain(lightLevel, 0, 255);//make sure the 
                                          //value is betwween 
                                          //0 and 255
analogWrite(ledPin, lightLevel);  //write the value

}