Rainbow gleam Arduino / esp8266

gleam.ino

// Metro library for timing: https://github.com/surik00/Arduino-Metro
#include <Metro.h>


#define RED_PIN 16
#define GREEN_PIN 14
#define BLUE_PIN 12

#define ARR_LEN 6
#define RGB_MAX 255
#define MAX_STEPS ARR_LEN * RGB_MAX


int rgbRainbowMap[ARR_LEN][3] = {
  { 1, 0, 0 },
  { 1, 1, 0 },
  { 0, 1, 0 },
  { 0, 1, 1 },
  { 0, 0, 1 },
  { 1, 0, 1 },
};

int gleamStep = MAX_STEPS;
Metro gleamMetro = Metro(10);  // 200: 5 minutes  // 2353: 1 hour


void setup() {
  // Serial.begin(115200);
  // Serial.println("Hello world!");
  analogWriteRange(256);

  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
}

void loop(){
  moodLight();
}

void moodLight() {
  if (gleamMetro.check()) {
    if (gleamStep >= MAX_STEPS) {
      // Serial.print("Reset time: ");
      // Serial.println(millis());
      gleamStep = 0;
    };
    moodRgb(gleamStep++);
  };
};

void moodRgb(int step) {
  // Serial.print("Mood RGB step ");
  // Serial.println(step);
  int rgb[3] = {0, 0, 0};
  const int index = step / RGB_MAX;
  const int _mod = step % RGB_MAX;
  const int next = (index + 1 < ARR_LEN) ? index + 1 : 0;

  for (int i = 0; i < 3; i++) {
    const int section = rgbRainbowMap[index][i];
    const int nextSection = rgbRainbowMap[next][i];
    if (section == nextSection)
      rgb[i] = section * RGB_MAX;
    else if (section > nextSection)
      rgb[i] = RGB_MAX - _mod;
    else
      rgb[i] = _mod;
  };
  // Serial.print("[");
  // Serial.print(rgb[0]);
  // Serial.print(", ");
  // Serial.print(rgb[1]);
  // Serial.print(", ");
  // Serial.print(rgb[2]);
  // Serial.println("]");
  setRgb(rgb[0], rgb[1], rgb[2]);
}


void setRgb(int red, int green, int blue) {
  analogWrite(RED_PIN, red);
  analogWrite(GREEN_PIN, green);
  analogWrite(BLUE_PIN, blue);
}