//  https://wokwi.com/projects/359721102307523585
// for https://forum.arduino.cc/t/thermistor-output-connected-to-nodemcu-esp32/1074739

#define THERMISTORPIN 34
const double VCC = 3.3;             // NodeMCU on board 3.3v vcc
const double R2 = 10000;            // 10k ohm series resistor
const double adc_resolution = 4096; // 12-bit adc

const double A = 0.001129148;   // thermistor equation parameters
const double B = 0.000234125;
const double C = 0.0000000876741; 

int ledPins[] = {
  32,33,25,26,27,14,12,13,2,4
};

int ledCount = 10;

void setup() {
  Serial.begin(9600); 
  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
    pinMode(ledPins[thisLed], OUTPUT);
  }
}

void loop() {
  double Vout, Rth, kelvin, tempC, tempF, adc_value; 

  adc_value = adc_resolution-analogRead(THERMISTORPIN)+0.5; // switch direction
  Vout = (adc_value * VCC) / adc_resolution; 
  Rth = (VCC * R2 / Vout) - R2; // Formula for R2 as Pull-down: Vcc-Rth-R2-GND


  kelvin = (1 / (A + (B * log(Rth)) + (C * pow((log(Rth)),3))));   // Temperature in kelvin

  tempC = kelvin - 273.15;  
  tempF = (tempC * 9/5) +32;

  int tempFMap = map(tempF*100, 1394, 17540, 0,10);

  for(int i = 0; i <= tempFMap; i++){

    digitalWrite(ledPins[ledCount-1-i], LOW);
  }

  // switch(tempFMap){
  //   case: 1

  // }
  Serial.print("Rth:");
  Serial.print(Rth);
  Serial.print(" Temperature = ");
  Serial.print(tempC);
  Serial.println(" degree celsius or ");
  Serial.print(tempF);
  Serial.println(" degree fareinghit");
  delay(500);
  clearDisplay();
}

void clearDisplay(){
  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
    digitalWrite(ledPins[ledCount-1-thisLed], HIGH);
  }
}