// Reference https://docs.wokwi.com/parts/wokwi-ntc-temperature-sensor

#define sensorPin A0
#define BETA 3950

int ledArray[] = {4,5,6,7,8,9,10,11,12,13};

void setup() {Serial.begin(115200);

  // Set all LED pins as OUTPUT
  // We loop through the ledPins array to set each one
  for (int i = 0; i < ledCount; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
    // initialize LEDs and sensor pin
}

void loop() {
  // 1. Read the analog sensor value
  // This gives a value from 0 to 1023 on the Arduino Uno
  int sensorVal = analogRead(sensorPin);

  // 2. Convert the analog value (0-1023) to a voltage (0-5V)
  // We use 5.0 and 1023.0 to force floating-point math
  float voltage = sensorVal * (5.0 / 1023.0);

  // 3. Convert the voltage to temperature in Celsius
  // For the TMP36 sensor: (voltage - 0.5V offset) * 100 degrees/Volt
  float tempC = (voltage - 0.5) * 100.0;

  // 4. Print the current temperature to the Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(tempC);
  Serial.println(" C");

  // 5. Map the temperature to the number of LEDs (0-10)
  
  // First, we constrain the temperature to our defined min/max range.
  // If tempC is 19, constrainedTempC will be 20.
  // If tempC is 40, constrainedTempC will be 35.
  float constrainedTempC = constrain(tempC, minTempC, maxTempC);

  // Now, map the constrained temperature to the 0-10 LED level.
  // The map() function works with 'long' integers.
  // We multiply by 100 to preserve decimal precision during the mapping.
  int ledLevel = map(constrainedTempC * 100, minTempC * 100, maxTempC * 100, 0, ledCount);

  /*
    // --- Alternative (and simpler) if/else logic ---
    // This logic also perfectly matches the README requirements.
    int ledLevel;
    if (tempC <= minTempC) {
      ledLevel = 0;
    } else if (tempC >= maxTempC) {
      ledLevel = 10;
    } else {
      // We are in the active range (20...35)
      // Map the temperature to a level from 0-10
      // We multiply by 100 to maintain precision for map()
      ledLevel = map(tempC * 100, minTempC * 100, maxTempC * 100, 0, 10);
    }
    // You can use this block instead of the constrain/map block above.
  */


  // Print the calculated LED level for debugging
  Serial.print("LED Level (0-10): ");
  Serial.println(ledLevel);

  // 6. Light up the corresponding number of LEDs
  for (int i = 0; i < ledCount; i++) {
   
    if (i < ledLevel) {
      digitalWrite(ledPins[i], HIGH);
    } else {
      // Otherwise, turn it off
      digitalWrite(ledPins[i], LOW);
    }
  
  
  delay(10); // this speeds up the simulation
}