MAX6675_RK Class Reference

Class for reading a MAX6665 SPI thermocouple interface. More...

#include <MAX6675_RK.h>

Public Member Functions
	MAX6675_RK ()
	Construct an object using primary SPI (SPI) and default CS pin (SS)
	MAX6675_RK (pin_t csPin)
	Construct an object using primary SPI (SPI) and the specified CS pin.
	MAX6675_RK (SPIClass *spi, pin_t csPin)
	Construct an object using the specified SPI interface and the specified CS pin.
MAX6675_RK &	withSPI (SPIClass *spi)
	Set the SPI interface if not setting it from the constructor.
MAX6675_RK &	withCS (pin_t csPin)
	Set the CS pin it not setting it from the constructor.
MAX6675_RK &	withOpenDetection (bool value)
	Sets whether open detection mode is enabled or not (default is true)
void	setup ()
	Perform setup operations; call this from global application setup()
uint16_t	readRaw ()
	Read the raw 16-bit value from the sensor.
float	readValue ()
	Return a value in degrees Celsius.
float	readValueF ()
	Return a value in degrees Fahrenheit.

Static Public Member Functions
static float	convertCtoF (float value)
	Convert a value from degrees C to degrees F.

Protected Attributes
SPIClass *	spi = &SPI
	SPI interface to use.
pin_t	csPin = SS
	Pin to use for CS.
bool	openDetection = true
	Whether to detect open or missinbg sensor.
SPISettings	spiSettings = SPISettings(4 * MHZ, MSBFIRST, SPI_MODE3)
	SPI settings, You won't generally have to change these settings; they're based on what the MAX6675 requires.

Detailed Description

Class for reading a MAX6665 SPI thermocouple interface.

Constructor & Destructor Documentation

MAX6675_RK() [1/2]

MAX6675_RK::MAX6675_RK ( pin_t csPin )

inline

Construct an object using primary SPI (SPI) and the specified CS pin.

Parameters

csPin

A pin, such as D2.

MAX6675_RK() [2/2]

MAX6675_RK::MAX6675_RK ( SPIClass * spi, pin_t csPin )

inline

Construct an object using the specified SPI interface and the specified CS pin.

Parameters

spi	A SPI interface such as &SPI or &SPI1.
csPin	A pin, such as D2.

Member Function Documentation

convertCtoF()

static float MAX6675_RK::convertCtoF ( float value )

inlinestatic

Convert a value from degrees C to degrees F.

Parameters

value

Returns

float

readRaw()

uint16_t MAX6675_RK::readRaw

(

)

Read the raw 16-bit value from the sensor.

Returns

uint16_t

readValue()

float MAX6675_RK::readValue

(

)

Return a value in degrees Celsius.

Returns

float A value in degrees C. It will be in the range 0 <= value <= 1023.75.

Returns NaN if the sensor (T+ or T-) is not connected. See withOpenDetection().

Will typically return 0.0 if the chip is not connected via SPI.

readValueF()

float MAX6675_RK::readValueF ( )

inline

Return a value in degrees Fahrenheit.

Returns

float A value in degrees F. It will be in the range of 32.0 <= value <= 1874.75.

Returns NaN if the sensor (T+ or T-) is not connected. See withOpenDetection().

Will typically return 32.0 if the chip is not connected via SPI.

setup()

void MAX6675_RK::setup

(

)

Perform setup operations; call this from global application setup()

This must be done after with withXXX() methods. It basically calls spi->begin() with the specified csPin. This sets the pinMode of the SPI pins and csPin, and also sets the csPin to HIGH.

withCS()

MAX6675_RK & MAX6675_RK::withCS ( pin_t csPin )

inline

Set the CS pin it not setting it from the constructor.

Parameters

csPin

A pin, such as D2.

Returns

MAX6675_RK&

Must be called before setup().

withOpenDetection()

MAX6675_RK & MAX6675_RK::withOpenDetection ( bool value )

inline

Sets whether open detection mode is enabled or not (default is true)

Parameters

value

true is enable open detection, false to disable

Returns

MAX6675_RK&

The MAX6675 can detect sensor open (or missing), but only if T- and GND are connected. This feature is enabled by default because the suggested design connects the two. If for some reason you've isolated T- and GND, then be sure to use withOpenDetection(false).

withSPI()

MAX6675_RK & MAX6675_RK::withSPI ( SPIClass * spi )

inline

Set the SPI interface if not setting it from the constructor.

Parameters

spi	A SPI interface such as &SPI or &SPI1.

Returns

MAX6675_RK&

Must be called before setup().

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The documentation for this class was generated from the following files:

• src/MAX6675_RK.h
• src/MAX6675_RK.cpp