#include <Adafruit_NeoPixel.h>

Adafruit_NeoPixel ring(16, 4, NEO_GRB + NEO_KHZ800);

volatile static bool Ring_An = false; // Ring startet asugeschaltet

void setup() {
  Serial.begin(9600);
  pinMode(3, INPUT_PULLUP); // Button
  pinMode(4, OUTPUT); // LED-Ring
  pinMode(A1, INPUT); // Helligkeitssensor
  pinMode(A2, INPUT); // Potentiometer

  ring.begin();
  ring.show(); // Alle LEDs aus
  attachInterrupt(digitalPinToInterrupt(3), toggleRing, FALLING);
}

void toggleRing(){ 
    Ring_An = !Ring_An;
  }

void loop() {
  unsigned long lastDebounceTime = 0;
  if(Ring_An == true){
    unsigned long currentTime = millis();
    while (currentTime - lastDebounceTime < 100){
    }
      float Ruderlage = map(analogRead(A2), 0, 1023, -7, 8);
      int Helligkeit = map(analogRead(A1), 0, 1023, 255, 100);
      ring.clear();

    if (Ruderlage > 0) {
  for (int i = 0; i < Ruderlage; i++) {
    ring.setPixelColor(i, ring.Color(0, 255, 0)); // Grün
  }
} else {
  for (int i = 0; i < abs(Ruderlage); i++) {
    ring.setPixelColor(15 - i, ring.Color(255, 0, 0)); // Rot
  }
} 
  ring.setPixelColor(0, ring.Color(255, 255, 255));// Weiß bei LED 0
  ring.setBrightness(Helligkeit);
  ring.show();
  }else{
    ring.clear();
    ring.show();
  }
}