Component: RTD (MAX31865) (Environmental): Difference between revisions

Revision as of 14:17, 13 July 2026

Author	Matrix TSL
Version	1.0
Category	Environmental

RTD (MAX31865) component

Component to interface the MAX31865 RTD-to-digital converter IC. Uses a standard SPI interface to connect to the IC and measure RTD resistance / temperature. Compatible with PT100 and PT1000 temperature sensors.

Version information

Library Version, Component Version, Date, Author, Info
1, 1.0, 23-12-24, BR, Initial MAX31865 RTD component implementation

Detailed description

No detailed description exists yet for this component

Examples

No additional examples

Macro reference

AutoConvert

	AutoConvert
Enables or disables automatic continuous conversion.
- BYTE	Enable
0 = One-shot, 1 = Continuous
- VOID	Return

ClearFault

	ClearFault
Clears any latched fault flags in the MAX31865.
- VOID	Return

EnableBias

	EnableBias
Enables or disables the MAX31865 bias current.
- BYTE	Enable
0 = Off, 1 = On
- VOID	Return

Initialise

	Initialise
Initialises the SPI bus and basic MAX31865 configuration.
- VOID	Return

ReadFault

	ReadFault
Reads the MAX31865 fault status register.
- BYTE	Return

ReadTemperature

	ReadTemperature
Performs a sample and returns temperature in Degrees C.
- FLOAT	Return

Sample

	Sample
Performs a single MAX31865 conversion and returns the raw sensor reading.
- UINT	Return

SetNotchFilter

	SetNotchFilter
Sets the notch filter to 50Hz (1) or 60Hz (0).
- BYTE	Mode
0 = 50Hz, 1 = 60Hz
- VOID	Return

SetWires

	SetWires
Sets the RTD wiring mode (2/3/4-wire).
- BYTE	Wires
2, 3 or 4 wires
- VOID	Return

Property reference

	Properties
	RTD Properties
	RTD Type
Selects the RTD type used with the MAX31865.
	Reference Resistor (Ohms)
Reference resistor value used on the MAX31865 breakout (default 430 Ohms).
	Notch Filter

	Bias Current

	Auto Convert

	RTD Wiring Mode

	SPI Properties
	Channel
SPI Channel selector
	Prescale
Prescale option selector
	MOSI
SPI Data Out pin (MOSI).
	MISO
SPI Data In pin (MISO).
	CLK
SPI Clock pin (SCK).
	CS / SS
Chip Select / Slave Select pin used to enable the MAX31865.

Component Source Code

Please click here to download the component source project: FC_Comp_Source_ThermocoupleMAX31865.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_ThermocoupleMAX31865.fcfx

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+| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
 | width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''AutoConvert'''
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+| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
 | width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''ClearFault'''
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 | width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''EnableBias'''
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+| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
 | width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Initialise'''
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 | width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''ReadFault'''
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+| width="10%" align="center" class="mtx-class-macrohead" | [[File:Fc9-comp-macro.png]]
 | width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''ReadTemperature'''
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 | width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''SetNotchFilter'''
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 | width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''SetWires'''
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