Sha256: 8ffc3c06a3449fd560275736c5cc3202137f00d0513e651304c836fd78128a56
Contents?: true
Size: 765 Bytes
Versions: 27
Compression:
Stored size: 765 Bytes
Contents
#include "Types.h"
#include "TemperatureCalculator.h"
#include <math.h>
#ifndef logl
#define logl log
#endif
float TemperatureCalculator_Calculate(uint16 millivolts)
{
const double supply_voltage = 3.0;
const double series_resistance = 5000;
const double coefficient_A = 316589.698;
const double coefficient_B = -0.1382009;
double sensor_voltage = ((double)millivolts / 1000);
double resistance;
if (millivolts == 0)
{
return -INFINITY;
}
// Series resistor is 5k Ohms; Reference voltage is 3.0V
// R(t) = A * e^(B*t); R is resistance of thermisor; t is temperature in C
resistance = ((supply_voltage * series_resistance) / sensor_voltage) - series_resistance;
return (float)(logl(resistance / coefficient_A) / coefficient_B);
}
Version data entries
27 entries across 14 versions & 1 rubygems