#define HARDWARE_ID 0x00  // Sensor hardware ID
#define SOFTWARE_ID 0x400 // Sensor software ID
#define ANALOG_PIN A0     // Analog input pin
#define SERIAL_PORT_PIN 3 // S.port serial pin
#define MY_PERIOD 1000  // период в мс
#include <SPort.h>        //Include the SPort library

SPortHub hub(HARDWARE_ID, SERIAL_PORT_PIN); //Configure HUB with "HARDWARE_ID" and "SERIAL_PORT_PIN"
SimpleSPortSensor sensor1(SOFTWARE_ID);   //Configure Sensor with "Sensor software ID"

/*https://viereck.ch/ntc/ 
  Original Formula
  float measuredVoltage = _value / maxValue * (maxVoltage - minVoltage) + minVoltage;
  float _rNtc = measuredVoltage * R1 / (inputVoltage - measuredVoltage);
  float temperature = 1 / (log(_rNtc / ntcR25) / ntcBeta + 1 / (273.15 + 25)) - 273.15;

*/
 float inputVoltage = 5.0; //Input voltage
 float R1 = 4.7; //Serial resistance, KOhm
 float ntcR25 = 100; //Thermistor resistance, KOhm
 float ntcBeta = 3950; //Thermistor Beta coefficient
 float minVoltage = 0.000;
 float maxVoltage = 5.000;
 float maxValue = 1024;
 float coefficientOne;
 //float rNtc;
 //int T1;   
 uint32_t tmr1;         // переменная таймера

void setup() {
  Serial.begin(9600); 
  pinMode(ANALOG_PIN, INPUT);
  hub.registerSensor(sensor1);       //Add sensor to the hub
  hub.begin();                      //Start listening
  coefficientOne = 1 / maxValue * (maxVoltage - minVoltage);
//Serial.println("coefficientOne " + String(coefficientOne,8));
}

void loop() {
  hub.handle();                     //Handle new data
  if (millis() - tmr1 >= MY_PERIOD) {  // ищем разницу
 tmr1 = millis();                   // сброс таймера
  
  sensor1.value = GetTemperature();
  Serial.println("Calculated Temperature " + String(sensor1.value));
  } 
  }




float GetTemperature()
{
	//int _value = 0;
	int _value = analogRead(ANALOG_PIN);
  //Serial.println("ADC Output " + String(_value));
	float measuredVoltage = _value * coefficientOne + minVoltage;
  //Serial.println("Voltage " + String(measuredVoltage));
  float _rNtc = measuredVoltage * R1 / (inputVoltage - measuredVoltage);
  //Serial.println("_rNtc " + String(_rNtc));
  int temperature = 1 / (log(_rNtc / ntcR25) / ntcBeta + 0.003354016) - 273.15;
  //Serial.println("temperature " + String(temperature));
  return temperature;
}