FadeHoldFade.ino

// THIS GIST HAS NOT BEEN COMPILED OR TESTED

/**
 * Using the arduino-LEDFader library, this will fade an LED
 * connected to pin 3 up, down, up and then hold that brightness 
 * for 10 minutes before fading the LED again.
 * 
 * For a non-blocking version, see: https://gist.github.com/jgillick/f8fc7722f2c0d29d82b955d190b8b755
 */

#include <LEDFader.h>

#define HOLD_PWM 200      // The brightness to hold the LED at between breathing.
#define HOLD_TIME 600000  // How long to hold the LED between breathing.
#define FADE_TIME 3000    // The number of milliseconds each fade should take.

// Every time a fade completes, the program will move to the next step.
#define STEP_FADE_1 1 // fade all the way up
#define STEP_FADE_2 2 // fade all the way down
#define STEP_FADE_3 3 // fade up to HOLD_PWM brightness
#define STEP_HOLD   4 // hold this brightness for HOLD_TIME

LEDFader led = LEDFader(3);
uint8_t step = 0;

void setup() {
  led.set_value(0);
}

void loop() {
  led.update();

  // Transition to the next step when fading is done
  if (led.is_fading() == false) {
    step += 1;

    switch(step) {
      // Fade up
      case STEP_FADE_1:
        led.fade(255, FADE_TIME);
        break;
      // Fade down
      case STEP_FADE_2:
        led.fade(0, FADE_TIME);
        break;
      // Fade to hold brightness
      case STEP_FADE_3:
        led.fade(HOLD_PWM, FADE_TIME);
        break;
      // Hold it for HOLD_TIME milliseconds
      case STEP_HOLD:
        delay(HOLD_TIME);
        break;
    }

    if (step >= STEP_HOLD) {
      step = STEP_FADE_1;
    }
  }
}