/**
  Measurement of two temperatures with 2 NTCs and Arduino NanoCone
  https://wokwi.com/projects/349683872869384787

  Assumes two 10K@25℃ NTC thermistor with Beta = 3950K, connected in series with a 10K resistor.
  The voltage dividers have the NTC between Analog Input of Arduino Nano and GND

  Copyright (C) 2022, Luis Zorzano
*/

const float BETA = 3950; // should match the Beta Coefficient of the thermistor

void setup() {
  Serial.begin(9600);
}

void loop() {
  int N1 = analogRead(A1);
  int N2 = analogRead(A2);
  float V1 = N1/1024.0*5.0;
  float V2 = N2/1024.0*5.0;
  float R1 = 10000.0/(5.0/V1 - 1.0);
  float R2 = 10000.0/(5.0/V2 - 1.0);
  float t1 = 1/(1/298.15 + 1/BETA*log(R1/10000.0)) - 273.15;
  float t2 = 1/(1/298.15 + 1/BETA*log(R2/10000.0)) - 273.15;  
  Serial.print("Temperature 1: ");
  String S1 = "N1 = " + String(N1) + ", V1 = " + String(V1) + ", R1 = " + String(R1) + ", t1 = " + String(t1);
  Serial.print(S1);
  Serial.println(" ℃");
   Serial.print("Temperature 2: ");
  String S2 = "N2 = " + String(N2) + ", V2 = " + String(V2) + ", R2 = " + String(R2) + ", t2 = " + String(t2);  
  Serial.print(S2);
  Serial.println(" ℃");  
  delay(1000);
}