GY-63_MS5611/libraries/MAX31855/MAX31855.h

91 lines
2.5 KiB
C++

//
// FILE: MAX31855.h
// AUTHOR: Rob Tillaart
// VERSION: 0.1.07
// PURPOSE: MAX31855 - Thermocouple
// DATE: 2014-01-01
// URL:
//
// Released to the public domain
//
#ifndef MAX31855_H
#define MAX31855_H
#if (ARDUINO < 100)
#include "WProgram.h"
#else
#include "Arduino.h"
#endif
#define MAX31855_VERSION "0.1.07"
#define STATUS_OK 0x00
#define STATUS_OPEN_CIRCUIT 0x01
#define STATUS_SHORT_TO_GND 0x02
#define STATUS_SHORT_TO_VCC 0x04
#define STATUS_NOREAD 0x80
// Thermocouples working is based upon Seebeck effect.
// Different TC have a different Seebeck Coefficient (µV/°C)
// From http://www.analog.com/library/analogDialogue/archives/44-10/thermocouple.html
//
// As the MAX31855 is designed for K type sensors, one can calculate
// the factor needed to convert other sensors measurements.
//
// E_TC = 61 => 41/61 = 0.6721311475
// J_TC = 52 => 41/52 = 0.7884615385
// K_TC = 41 => 41/41 = 1
// N_TC = 27 => 41/27 = 1.5185185185
// R_TC = 9 => 41/9 = 4.5555555556
// S_TC = 6 => 41/6 = 6.8333333333
// T_TC = 41 => 41/41 = 1
// 0.1.07 updated with numbers from the MAX31855 datasheet
#define E_TC (41.276/76.373)
#define J_TC (41.276/57.953)
#define K_TC (41.276/41.276)
#define N_TC (41.276/36.256)
#define R_TC (41.276/10.506)
#define S_TC (41.276/9.587)
#define T_TC (41.276/52.18)
class MAX31855
{
public:
MAX31855(uint8_t SCLK, uint8_t CS, uint8_t MISO);
void begin();
uint8_t read();
double getInternal(void) const { return _internal; };
double getTemperature(void) const { return _temperature; };
double getTemperatureE(void)const { return _temperature * E_TC; };
double getTemperatureJ(void)const { return _temperature * J_TC; };
double getTemperatureK(void)const { return _temperature * K_TC; };
double getTemperatureN(void)const { return _temperature * N_TC; };
double getTemperatureR(void)const { return _temperature * R_TC; };
double getTemperatureS(void)const { return _temperature * S_TC; };
double getTemperatureT(void)const { return _temperature * T_TC; };
uint8_t getStatus(void) const { return _status; };
void setOffset(const double t) { _offset = t; };
double getOffset() const { return _offset; };
private:
uint32_t _read();
double _internal;
double _temperature;
uint8_t _status;
double _offset;
uint8_t _sclk;
uint8_t _miso;
uint8_t _cs;
};
#endif
// END OF FILE