/////// Code to controll an RGB LED strip. This will be mounted in a door frame to welcome me when I walk in.

#include <FastLED.h>

#define echoPin 7
#define trigPin 8
#define NUM_LEDS 45
#define ledPin 12

float brightness = 0;
float hue = 0;
float inc = 0;
float hueInc = .3;
float incSpeed;
int goState = LOW; ///// YES MOTION
int val = 0;
long duration;
long distance;
long starttime;
long endtime;

CRGB leds[NUM_LEDS];

void setup(){
  Serial.begin(9600);
  pinMode (echoPin, INPUT);
  pinMode (trigPin, OUTPUT);
  LEDS.addLeds<WS2812, ledPin, RGB>(leds, NUM_LEDS);
  LEDS.setBrightness(255);
  incSpeed = random(4, 6) / 100.0;
  clearAll();
}

void clearAll() {
  for (int i = 0; i < NUM_LEDS; i++) {
    leds[i] = CRGB( 0, 0, 0);
    delay(5);
    FastLED.show();
  }
}

// led code to run when motion is detected
void animate() {
  creepBootUp();
  fancy(65, 15);
}



void readMotion() { ///////////////// Detects with an UltraSonic sensor if someone is close by
 digitalWrite(trigPin, LOW);
 delayMicroseconds(2);
 digitalWrite(trigPin, HIGH);
 delayMicroseconds(10);
 digitalWrite(trigPin,LOW);
 duration = pulseIn (echoPin, HIGH);
 //This gives us distance in cm
 distance = duration/58.2;
 Serial.println (distance);
 //Milliseconds
 delay(50);
 if (distance < 10){
  if(goState == LOW){
    animate();
    goState = HIGH;
  }
  }
  else {
    if (goState == HIGH) {
      clearAll();
      goState = LOW;
    }
  }
}

// do that gradual white fill from the middle
void creepBootUp() {
  float start = NUM_LEDS / 2;
  float bright = 0;
  while (start < NUM_LEDS + 10) {
    start += .5;
    for (int i = NUM_LEDS / 2; i < NUM_LEDS; i++) {
      if (i <= start) {
        bright = (start - i) * 3;
        if (bright > 255) {
          bright = 255;
        }
        leds[i] = CRGB( bright, bright, bright);
        leds[NUM_LEDS / 2 - (i - NUM_LEDS / 2)] = CRGB( bright, bright, bright);
      }
      else {
        leds[i] = CRGB( 0, 0, 0);
        leds[NUM_LEDS / 2 - (i - NUM_LEDS / 2)] = CRGB( 0, 0, 0);
      }
    }
    FastLED.show();
    delay(7);
  }
}

void fancy(uint8_t thisSpeed, uint8_t deltaHue) {
starttime = millis();
endtime = starttime;
while ((endtime - starttime) <=3000) // do this loop for up to 5000mS
{
uint8_t thisHue = beatsin8(thisSpeed,0,255);                // A simple rainbow wave.
 //uint8_t thisHue = beat8(thisSpeed,255);                     // A simple rainbow march.

 fill_rainbow(leds, NUM_LEDS, thisHue, deltaHue);
 FastLED.show();
endtime = millis();
}
            // Use FastLED's fill_rainbow routine.

}

void loop() {
  readMotion();
}