HEIKINLEDIT

const int ledPin = 3;
const int button = 7;
const int maxPWM = 255;
const int minPWM = 0;
int fadeDirection = 1;
int buttonState = 0;
int lastButtonState = 0;
int brightness = 0;
int counter = 1;
byte fade = 5;
int fadeInterval = 50;
unsigned long lastMillis;
unsigned long currentMillis;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(button, INPUT);
  Serial.begin(9600);
}

void LightLoop(){
  currentMillis = millis();
  if (currentMillis - lastMillis >= fadeInterval){
    if (fadeDirection == 1) {
      brightness = brightness + fade;
      if (brightness >= maxPWM) {
        brightness = maxPWM;
        fadeDirection = 0;
      }
    }
    else {
      brightness = brightness - fade;
      if (brightness <= minPWM){
        brightness = minPWM;
        fadeDirection = 1;
      }
    }
  }
  analogWrite(ledPin, brightness);
}

void loop() {
  buttonState = digitalRead(button);
  delay(200);
  if (counter <= 1) {
    LightLoop();
    if (buttonState != lastButtonState){
      Serial.println("Push");
      fadeDirection = 0;
      counter ++;
    }
  }
  else {
     LightLoop();
     if (buttonState != lastButtonState){
      Serial.println("Push");
      fadeDirection = 1;
      counter = 1;
     }
  }
}