/*
  
  Forum: https://forum.arduino.cc/t/mit-unerklarlicher-ruckler-bei-led-effekt/1159262
  Wokwi: https://wokwi.com/projects/373344458406571009

*/

#include <Adafruit_NeoPixel.h>

enum  EffectDirection { FORWARD, REVERSE };

const uint8_t  LEDPIN1 = 5;
const uint16_t NUMPIXELS1 = 300;
Adafruit_NeoPixel strip1(NUMPIXELS1, LEDPIN1, NEO_GRB + NEO_KHZ800);

constexpr byte ledRed = 7;
int Increment = 0;
int StartLED = 1;
int EndLED = 40;
uint32_t Color1 = 0x0000DD;
int Direction = FORWARD;

void setup() {
  Serial.begin(115200);
  strip1.begin();
  strip1.clear();
  strip1.show();
  pinMode(ledRed,OUTPUT);
}

int count = 0;

void loop() {
		int ml = (EndLED - StartLED);

		if (Increment >= ml) { 
      Increment = 0; 
      digitalWrite(ledRed,HIGH);
			count++;
      }
    if (Increment == 10) {digitalWrite(ledRed,LOW);}
		Increment++;

		if (Direction == REVERSE) {
			for (uint16_t i = StartLED; i <= EndLED; i++) {
				strip1.setPixelColor(i, ((sin(Increment + i) * 127 + 128) / 255) * ((Color1 >> 16) & 0xFF),
					((sin(Increment + i) * 127 + 128) / 255) * ((Color1 >> 8) & 0xFF),
					((sin(Increment + i) * 127 + 128) / 255) * (Color1 & 0xFF));
			}
		}
		else { // Forward
			for (uint16_t i = StartLED; i <= EndLED; i++) {
				strip1.setPixelColor(i, ((sin(i - Increment) * 127 + 128) / 255) * ((Color1 >> 16) & 0xFF),
					((sin(i - Increment) * 127 + 128) / 255) * ((Color1 >> 8) & 0xFF),
					((sin(i - Increment) * 127 + 128) / 255) * (Color1 & 0xFF));
			}
		}
		strip1.show();
    delay(50);
		if (count >= 2){
			 count = 0;
  		 Increment = 0;
			if (Direction == REVERSE) {
         Direction = FORWARD;
				 Serial.println("FORWARD");
			} else {
         Direction = REVERSE;
				 Serial.println("REVERSE");
			}
		}
}