microcontroller/nightlight/nightlight.ino

// https://lastminuteengineers.com/rotary-encoder-arduino-tutorial/

#include <Adafruit_NeoPixel.h>

#define NUMPIXELS 12
#define LEDPIN D1

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, LEDPIN, NEO_GRB + NEO_KHZ800);

// Rotary Encoder Inputs
#define CLK D5
#define DT D6
#define SW D7

#define CLK2 D2
#define DT2 D3
#define SW2 D4

int currentStateCLK;
int currentStateCLK2;
int lastStateCLK;
int lastStateCLK2;
String currentDir = "";
int btnState = 1;
int btnState2 = 1;
int lastBtnState = 1;
int lastBtnState2 = 1;
bool pressed = false;
bool isOn = false;
bool rotated = false;
//unsigned long lastButtonPress = 0;



#define HUE_STEP 1200
#define VAL_STEP 10

long hue = 0;        // 0-65535 https://adafruit.github.io/Adafruit_NeoPixel/html/class_adafruit___neo_pixel.html#a1f16aee5b96e16e62598f826e292b23b
int saturation = 0;  // 0-255
int value = 0;      // 0-255



void setup() {
  Serial.begin(115200);

  pinMode(CLK,INPUT);
  pinMode(DT,INPUT);
  pinMode(SW, INPUT_PULLUP);
  
  // Read the initial state of CLK
  lastStateCLK = digitalRead(CLK);
  
  Serial.println("PIXELS");
  pixels.begin(); // initialize NeoPixel library.

  fade(200);

  hue = 4800;
  saturation = 255;
  value = 60;
  pixels.fill(pixels.gamma32(pixels.ColorHSV(hue, saturation, 0)), 0, NUMPIXELS);
  pixels.show();
}

void fade(int maxValue) {
  for (int fval = 0; fval <= maxValue; fval++) {
    pixels.fill(pixels.gamma32(pixels.ColorHSV(0, 0, fval)), 0, NUMPIXELS);
    pixels.show();
    delay(10);
  }
  for (int fval = maxValue; fval >= 0; fval--) {
    pixels.fill(pixels.gamma32(pixels.ColorHSV(0, 0, fval)), 0, NUMPIXELS);
    pixels.show();
    delay(10);
  }
  pixels.clear();
  pixels.show();
}

/*void rainbow(int wait) {
  for(long firstPixelHue = 0; firstPixelHue < 5*65536; firstPixelHue += 256) {
    for(int i=0; i<pixels.numPixels(); i++) { 
      int pixelHue = firstPixelHue + (i * 65536L / pixels.numPixels());
      pixels.setPixelColor(i, pixels.gamma32(pixels.ColorHSV(pixelHue)));
    }
    pixels.show();
    delay(wait);
  }
}*/

void loop() {
  currentStateCLK = digitalRead(CLK);
  currentStateCLK2 = digitalRead(CLK2);

  // If last and current state of CLK are different, then pulse occurred
  if (currentStateCLK != lastStateCLK  && currentStateCLK == 1) {
    rotated = true;
    btnState = digitalRead(SW);
    
    if (digitalRead(DT) != currentStateCLK) {
      currentDir ="CW";
      if (btnState == LOW && isOn) {
        hue += HUE_STEP;
        if (hue > 65535) {
          hue = 65535;
          saturation = 0;
        }
        else {
          saturation = 255;
        }
      }
      else {
        value += VAL_STEP;
        if (value > 255) {
          value = 255;
        }
      }
    } else {
      currentDir ="CCW";
      if (btnState == LOW) {
        hue -= HUE_STEP;
        if (hue < 0) {
          hue = 0;
          saturation = 0;
        }
        else {
          saturation = 255;
        }
      }
      else {
        value -= VAL_STEP;
        if (value < 30) {
          value = 0;
        }
      }
    }

    if (value > 0) {
      isOn = true;
    }
    else {
      isOn = false;
    }
    
    pixels.fill(pixels.gamma32(pixels.ColorHSV(hue, saturation, value)), 0, NUMPIXELS);
    pixels.show();

    Serial.print("Direction: ");
    Serial.print(currentDir);
    Serial.print(" | Hue: ");
    Serial.print(hue);
    Serial.print(" | Sat: ");
    Serial.print(saturation);
    Serial.print(" | Val: ");
    Serial.println(value);
  }
  else if (currentStateCLK2 != lastStateCLK2  && currentStateCLK2 == 1) {
    rotated = true;
    btnState2 = digitalRead(SW2);
    
    if (digitalRead(DT2) != currentStateCLK2) {
      currentDir ="CW";
      if (btnState2 == LOW && isOn) {
        hue += HUE_STEP;
        if (hue > 65535) {
          hue = 65535;
          saturation = 0;
        }
        else {
          saturation = 255;
        }
      }
      else {
        value += VAL_STEP;
        if (value > 255) {
          value = 255;
        }
      }
    } else {
      currentDir ="CCW";
      if (btnState2 == LOW) {
        hue -= HUE_STEP;
        if (hue < 0) {
          hue = 0;
          saturation = 0;
        }
        else {
          saturation = 255;
        }
      }
      else {
        value -= VAL_STEP;
        if (value < 30) {
          value = 0;
        }
      }
    }

    if (value > 0) {
      isOn = true;
    }
    else {
      isOn = false;
    }
    
    pixels.fill(pixels.gamma32(pixels.ColorHSV(hue, saturation, value)), 0, NUMPIXELS);
    pixels.show();
    
    Serial.print("Direction 2: ");
    Serial.print(currentDir);
    Serial.print(" | Button State: ");
    Serial.print(btnState2);
    Serial.print(" | Hue: ");
    Serial.print(hue);
    Serial.print(" | Sat: ");
    Serial.print(saturation);
    Serial.print(" | Val: ");
    Serial.println(value);
  }
  else {
    btnState = digitalRead(SW);
    btnState2 = digitalRead(SW2);

    if (btnState == 0 || btnState2 == 0) {
      pressed = true;
    }
    else {
      if (rotated) {
        rotated = false;
        pressed = false;
      }
      else if (pressed) {
        if (isOn) {
          pixels.fill(pixels.gamma32(pixels.ColorHSV(hue, saturation, 0)), 0, NUMPIXELS);
          pixels.show();
          isOn = false;
          Serial.println("off");
        }
        else {
          pixels.fill(pixels.gamma32(pixels.ColorHSV(hue, saturation, value)), 0, NUMPIXELS);
          pixels.show();
          isOn = true;
          Serial.println("on");
        }
        pressed = false;
      }
    }
  }

  lastStateCLK = currentStateCLK;
  lastStateCLK2 = currentStateCLK2;

  // Put in a slight delay to help debounce the reading
  delay(1);
}