breaklights-breathe.ino

#include "CurieIMU.h"
#include <Adafruit_DotStar.h>
#include <SPI.h>

#define NUMPIXELS 60 // Number of LEDs in strip
#define MINBRIGHTNESS 100
#define MAXBRIGHTNESS 255
#define DATAPIN    5
#define CLOCKPIN   4

int head  = 0, tail = -10; // Index of first 'on' and 'off' pixels

Adafruit_DotStar strip(NUMPIXELS, DATAPIN, CLOCKPIN, DOTSTAR_BRG);

boolean blinkState = false;          // state of the LED
unsigned long loopTime = 0;          // get the time since program started
unsigned long interruptsTime = 0;    // get the time when motion event is detected

int brightness = 0;
boolean goUp = true;

void setup() {

  CurieIMU.begin();
  CurieIMU.attachInterrupt(eventCallback);

  /* Enable Motion Detection */
  CurieIMU.setDetectionThreshold(CURIE_IMU_MOTION, 500); // 20mg
  CurieIMU.setDetectionDuration(CURIE_IMU_MOTION, 250);  // trigger times of consecutive slope data points
  CurieIMU.interrupts(CURIE_IMU_MOTION);

  strip.begin(); // Initialize pins for output
  strip.show();  // Turn all LEDs off ASAP

}

void loop() {
  stripBreathe();
}

/**
 * Breathe.
 * 
 * Runs when not on brake mode.
 */
void stripBreathe() {
  if (goUp) {
    brightness++;
    if ( MAXBRIGHTNESS <= brightness ) goUp = false;
  } else {
    brightness--;
    if ( MINBRIGHTNESS >= brightness ) goUp = true;
  }

//  strip.fill(0xFFFFFF, 0, NUMPIXELS);
  stripRoll();
  strip.setBrightness(brightness);
  strip.show();
  delay(10);  
}

void stripRoll() {
  strip.setPixelColor(head, 0xFFFFFF); // 'On' pixel at head
  strip.setPixelColor(tail, 0);     // 'Off' pixel at tail

  if(++head >= NUMPIXELS) {         // Increment head index.  Off end of strip?
    head = 0;                       //  Yes, reset head index to start
  }
  if(++tail >= NUMPIXELS) tail = 0; // Increment, reset tail index

}

/**
 * Blink once.
 */
void stripBlink() {
  strip.fill(0x00FF00, 0, NUMPIXELS);
  strip.setBrightness(200); strip.show();
  delay(17);
  strip.clear();
  strip.show();
  delay(40);  
}

/**
 * Break lights.
 */
static void eventCallback(void) {
  if (CurieIMU.getInterruptStatus(CURIE_IMU_MOTION)) {
    stripBlink();
    stripBlink();
    stripBlink();
    stripBlink();
    stripBlink();
    stripBlink();
    stripBlink();
    stripBlink();
    stripBlink();
    stripBlink();
    interruptsTime = millis();
  }
}