#define led1 2
#define led2 3
#define led3 4
#define led4 6
#define potent A0
#define pushButton 5
unsigned long previousMillis1 = 0, previousPrintMillis = 0;
const long interval1 = 1000, printInterval = 1000;


void setup() {
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(pushButton, INPUT_PULLUP);
  Serial.begin(9600);
}

void loop() {
   unsigned long currentMillis = millis();
   if (currentMillis - previousMillis1 >= interval1){
     previousMillis1 = currentMillis;
     digitalWrite(led1,!digitalRead(led1));
   }
  
    if (Serial.available() > 0) {
    int value = Serial.parseInt();
    if (value >= 0 && value <= 255) {
      analogWrite(led2, value);
    }
  }
 
   if (digitalRead(pushButton) == LOW) {
    digitalWrite(led3, HIGH);
  } else {
    digitalWrite(led3, LOW);
  }
  int potValue = analogRead(potent);
  if (potValue > 512) {
    digitalWrite(led4, HIGH);
  } else {
    digitalWrite(led4, LOW);
  }

  if (currentMillis - previousPrintMillis >= printInterval) {
    previousPrintMillis = currentMillis;
    Serial.println(potValue);
  }

}