#include <Adafruit_NeoPixel.h>

const int clkPin = 2;    // Pin connected to CLK on the rotary encoder
const int dtPin = 3;     // Pin connected to DT on the rotary encoder
const int swPin = 4;     // Pin connected to SW on the rotary encoder

const int ledPin = 6;    // Pin connected to DIN on the LED ring

const int numLEDs = 16;  // Number of LEDs in the ring (change as needed)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(numLEDs, ledPin, NEO_GRB + NEO_KHZ800);

int lastStateCLK;
int currentStateCLK;
int level = 0;

void setup() {
  // Initialize the LED ring
  strip.begin();
  strip.show();  // Initialize all LEDs to off

  // Initialize rotary encoder pins
  pinMode(clkPin, INPUT);
  pinMode(dtPin, INPUT);
  pinMode(swPin, INPUT_PULLUP);

  // Read the initial state of the CLK pin
  lastStateCLK = digitalRead(clkPin);
}

void loop() {
  // Read the current state of the CLK pin
  currentStateCLK = digitalRead(clkPin);

  // If the state has changed, then the encoder has been rotated
  if (currentStateCLK != lastStateCLK) {
    // Read the DT pin
    int dtState = digitalRead(dtPin);

    // Determine the direction of rotation
    if (dtState != currentStateCLK) {
      // Turning clockwise
      level++;
      if (level > numLEDs) level = numLEDs;
    } else {
      // Turning counterclockwise
      level--;
      if (level < 0) level = 0;
    }

    // Update the LED ring
    strip.clear();
    for (int i = 0; i < level; i++) {
      strip.setPixelColor(i, strip.Color(255, 255, 255)); // Set color to red (you can change the color)
    }
    strip.show();
  }

  // Update the last states
  lastStateCLK = currentStateCLK;
}