const int sensorPin = A0; 
const byte ledPins[] = {4, 5, 6, 7, 8, 9, 10, 11, 12, 13}; 
const int numLEDs = 10;  

void setup() {
  
  for (byte i = 0; i < numLEDs; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
}

void loop() {
  
  int analogValue = analogRead(sensorPin);

  
  float temperature = convertToCelsius(analogValue);

  
  int ledCount = map(temperature, -24, 80, 0, numLEDs); 
  ledCount = constrain(ledCount, 0, numLEDs); 

  
  for (byte i = 0; i < numLEDs; i++) {
    if (i < ledCount) {
      digitalWrite(ledPins[i], LOW); 
    } else {
      digitalWrite(ledPins[i], HIGH); 
    }
  }

  
  delay(1000);
}


float convertToCelsius(int analogValue) {

  const float BETA = 3950.0;
  float resistance = (1023.0 / analogValue) - 1.0;
  resistance = 10000.0 * resistance; 
  float temperature = 1.0 / (log(resistance / 10000.0) / BETA + 1.0 / 298.15) - 273.15;  
  return temperature;
}