Sha256: 039855738d751daf03662f4053bcf6904d3b5c78f98c28d42469d9b3f1f91b77
Contents?: true
Size: 792 Bytes
Versions: 54
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Stored size: 792 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
54 entries across 39 versions & 1 rubygems