const int ledPin[] = {2, 3, 4, 5, 6, 7, 8, 9}; 
const int led = 8;  

void setup() {
  Serial.begin(9600);
  for (int i = 0; i < led; i++) {
    pinMode(ledPin[i], OUTPUT); 
  }
}

void loop() {
  int sensorValue = analogRead(A0); 
  float v = map(sensorValue, 0, 1023, 0, 300) / 100.0; 
  Serial.println(v);
  for (int i = 0; i < led; i++) {
   float value = (i + 1) * 0.375; 
   if (v >= value) {
    digitalWrite(ledPin[i], HIGH); 
  }
  else{
    digitalWrite(ledPin[i], LOW);
  }
 }
}