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41 lines
1.1 KiB
C++
41 lines
1.1 KiB
C++
/*
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Fade
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This example shows how to fade an LED on pin 9 using the analogWrite()
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function.
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The analogWrite() function uses PWM, so if you want to change the pin you're
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using, be sure to use another PWM capable pin. On most Arduino, the PWM pins
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are identified with a "~" sign, like ~3, ~5, ~6, ~9, ~10 and ~11.
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This example code is in the public domain.
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http://www.arduino.cc/en/Tutorial/Fade
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*/
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int led = 9; // the PWM pin the LED is attached to
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int brightness = 0; // how bright the LED is
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int fadeAmount = 5; // how many points to fade the LED by
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// the setup routine runs once when you press reset:
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void setup() {
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// declare pin 9 to be an output:
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pinMode(led, OUTPUT);
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}
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// the loop routine runs over and over again forever:
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void loop() {
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// set the brightness of pin 9:
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analogWrite(led, brightness);
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// change the brightness for next time through the loop:
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brightness = brightness + fadeAmount;
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// reverse the direction of the fading at the ends of the fade:
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if (brightness <= 0 || brightness >= 255) {
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fadeAmount = -fadeAmount;
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}
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// wait for 30 milliseconds to see the dimming effect
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delay(30);
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}
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