// James Rutter | 2021.05.13
// Networking and Communications 
// ATtiny412 Tempature Sensor 
// Reference: https://create.arduino.cc/projecthub/iasonas-christoulakis/make-an-arduino-temperature-sensor-thermistor-tutorial-b26ed3

#include <SoftwareSerial.h>
SoftwareSerial mySerial(2,3); //RX, TX

const int sensorPin = 4; 

int Vo; // voltage across thermistor and 10K resister (R1) 
float R1 = 10000; // fixed value resistor 
float R2; // resistance of thermistor (variable) 

float logR2, T; 
float c1 = 1.009249522e-03, c2 = 2.378405444e-04, c3 = 2.019202697e-07;

int Tf; // display units in farenheight 

void setup() {
  mySerial.begin(115200);
  pinMode(sensorPin, INPUT);
}

void loop() {

  Vo = analogRead(sensorPin);

  R2 = R1 * (1023.0 / (float)Vo - 1.0); // steinhart-hart equation 
  
  logR2 = log(R2);
  
  T = (1.0 / (c1 + c2*logR2 + c3*logR2*logR2*logR2));
  T = T - 273.15;
  T = (T * 9.0)/ 5.0 + 32.0; // convert to farenheight unit degrees
  T = 
  Tf = (int)T; // convert to integer for saving memory (warning: will round to the nearest whole number). 


  mySerial.print("Tempature (F): ");
  mySerial.println(Tf);
  
}