| /* | |
| Fade | |
| This example shows how to fade an LED on pin 9 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. | |
| https://www.arduino.cc/en/Tutorial/BuiltInExamples/Fade | |
| */ | |
| int led = 9; // the PWM pin the LED is attached to | |
| int brightness = 0; // how bright the LED is | |
| int fadeAmount = 5; // how many points to fade the LED by | |
| // the setup routine runs once when you press reset: | |
| void setup() { | |
| // declare pin 9 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); | |
| } | |