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Los LEDs emplean salidas que admiten modulación PWM. Esto significa que podemos
controlar el brillo de cada uno mediante la funcion analogWrite( valor ) , con valor en el rango { 0 –
255 }.
El siguiente programa es una modificación del ejemplo "Fade", disponible en el menú
/*
Fade
This example shows how to fade an LED on pin 3 using the analogWrite() function.
The analogWrite() function uses PWM, so if you want to change the pin you're using, be sure to use another PWM
capable pin. On most Arduino, the PWM pins are identified with a "~" sign, like ~3, ~5, ~6, ~9, ~10 and ~11.
This example code is in the public domain.
*/
int led = 3;
int brightness = 0;
int fadeAmount = 5;
// the setup routine runs once when you press reset:
void setup()
{
// declare pin 3 to be an output:
pinMode(led, OUTPUT);
}
// the loop routine runs over and over again forever:
void loop()
{
// set the brightness of pin 9:
analogWrite(led, brightness);
// change the brightness for next time through the loop:
brightness = brightness + fadeAmount;
// reverse the direction of the fading at the ends of the fade:
if (brightness <= 0 || brightness >= 255) {
fadeAmount = -fadeAmount;
}
// wait for 30 milliseconds to see the dimming effect
delay(30);
}
Archivo → Ejemplos → Basics → Fade
// the PWM pin the LED is attached to
// how bright the LED is
// how many points to fade the LED by
Hispalis RobIOTics Arduino Trainer v1.0
Hispalis RobIOTics Arduino Trainer v1.0
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