#define SENSOR A0
#define LED_COUNTS 10

const int LED[] = {2, 3, 4, 5, 6, 7,8,9,10,11};

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  while(!Serial);
  for(int i = 0; i < LED_COUNTS; ++i) {
    pinMode(LED[i], OUTPUT);
  }
}

void led_bar(int led_level) {
  for(int idx=0; idx < LED_COUNTS; ++idx) {
    if(idx < led_level) {
      digitalWrite(LED[idx], HIGH);
    } else {
      digitalWrite(LED[idx], LOW);
    }
  }
}

float read_temp() {
  const float BETA = 3950; // should match the Beta Coefficient of the thermistor
  int analogValue = analogRead(A0);
  float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  return celsius;
}

void loop() {
  // put your main code here, to run repeatedly:
  
  float temp = read_temp();

  Serial.print("value is: ");
  Serial.println(temp);
  int led_level = map(temp,-24, 80, 0, LED_COUNTS);

  Serial.print("led level is: ");
  Serial.println(led_level);

  led_bar(led_level);

  delay(200);
}