#include "sensorTemperatura.h"
#define MAXADC 1024
#define VMAX 5
#define ZEROC 273

sensorTemperatura::sensorTemperatura(int pinoADC) 
{
  _pino = pinoADC; 
  
  // para RTC 1K 102
  calibra(1000, 1000, 3636, 298);

}
float sensorTemperatura::tempK() 
{
  float adc = analogRead(_pino);
  float V = (VMAX*adc/MAXADC);
  float R = (VMAX-V)*_REXT/V;
  float T = _B/log(R/(_R0*exp(-_B/_T0)));
  return T;

}
float sensorTemperatura::tempC()
{
  return tempK()-ZEROC;
}
void sensorTemperatura::calibra(float REXT, float R0, 
float B, float T0)
{ 
  _REXT = REXT;
  _R0 = R0;
  _B  = B;
  _T0 = T0;
}