/*
  ReadAnalogVoltage

  Reads an analog input on pin 0, converts it to voltage, and prints the result to the Serial Monitor.
  Graphical representation is available using Serial Plotter (Tools > Serial Plotter menu).
  Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.

  This example code is in the public domain.

  https://www.arduino.cc/en/Tutorial/BuiltInExamples/ReadAnalogVoltage
*/

// Modifikacijaprogramov ReadAnalogVoltage in UporTermistorja za izračun in izpis temperature termistorja v °C
// Milenko Stiplovšek, 16. 3. 2022, uporaba brez omejitev

// Deklaracija in inicializacija spremenljivk

float U = 5.0;
float Ur = 5.0;
float Ut = 5.0;
float I = 0.0;
float R = 10000.0;
float Rt = 10000.0;

float TC = 0.0;
float iTK = 1.0;
float To = 298.15;
float TK = 1.0;
float B = 3435.0;
float Ro = 10000.0;

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin 0:
  int sensorValue = analogRead(A0);
  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
  // napetost na fiksnem uporu v vezju:
  Ur = sensorValue * (5.0 / 1023.0);
  
  //Izračuni električnih količin v vezju:
  I = Ur/R;
  Ut = U - Ur;
  Rt = Ut/I;

  //Izračun temperature s pomočjo parametra B
  iTK = 1.0/To + (1.0/B)*log(Rt/Ro);
  TK = 1.0/iTK;
  TC = TK - 273.15;
   
  // Izpis temperature termistorja v °C
  Serial.println(TC);
  delay(1000);
}