#define ADC_PIN A0
#define LED1_PIN 6
#define LED2_PIN 5
#define LED3_PIN 4
#define LED4_PIN 3

void setup() {
  Serial.begin(9600);
  pinMode(LED1_PIN, OUTPUT);
  pinMode(LED2_PIN, OUTPUT);
  pinMode(LED3_PIN, OUTPUT);
  pinMode(LED4_PIN, OUTPUT);

}

void loop() {
  if (analogRead(ADC_PIN) == 0) {
    digitalWrite(LED1_PIN, HIGH);
    digitalWrite(LED2_PIN, HIGH);
    digitalWrite(LED3_PIN, HIGH);
    digitalWrite(LED4_PIN, HIGH);
  }
  else if (analogRead(ADC_PIN) < 257) {
    digitalWrite(LED1_PIN, LOW);
    digitalWrite(LED2_PIN, HIGH);
    digitalWrite(LED3_PIN, HIGH);
    digitalWrite(LED4_PIN, HIGH);
  }
  else if (analogRead(ADC_PIN) < 513) {
    digitalWrite(LED1_PIN, HIGH);
    digitalWrite(LED2_PIN, LOW);
    digitalWrite(LED3_PIN, HIGH);
    digitalWrite(LED4_PIN, HIGH);
  }
  else if (analogRead(ADC_PIN) < 769) {
    digitalWrite(LED1_PIN, HIGH);
    digitalWrite(LED2_PIN, HIGH);
    digitalWrite(LED3_PIN, LOW);
    digitalWrite(LED4_PIN, HIGH);
  }
  else {
    digitalWrite(LED1_PIN, HIGH);
    digitalWrite(LED2_PIN, HIGH);
    digitalWrite(LED3_PIN, HIGH);
    digitalWrite(LED4_PIN, LOW);
  }
   

    Serial.println(analogRead(ADC_PIN));
}