Base-class for all sensors. More...

#include <sensor.h>

Inheritance diagram for esphome::sensor::Sensor:

Data Structures
struct	SensorFlags

Public Member Functions
	Sensor ()

int8_t	get_accuracy_decimals ()
	Get the accuracy in decimals, using the manual override if set.

void	set_accuracy_decimals (int8_t accuracy_decimals)
	Manually set the accuracy in decimals.

StateClass	get_state_class ()
	Get the state class, using the manual override if set.

void	set_state_class (StateClass state_class)
	Manually set the state class.

bool	get_force_update () const
	Get whether force update mode is enabled.

void	set_force_update (bool force_update)
	Set force update mode.

void	add_filter (Filter *filter)
	Add a filter to the filter chain. Will be appended to the back.

void	add_filters (std::initializer_list< Filter * > filters)
	Add a list of vectors to the back of the filter chain.

void	set_filters (std::initializer_list< Filter * > filters)
	Clear the filters and replace them by filters.

void	clear_filters ()
	Clear the entire filter chain.

float	get_state () const
	Getter-syntax for .state.

float	get_raw_state () const
	Getter-syntax for .raw_state.

void	publish_state (float state)
	Publish a new state to the front-end.

void	add_on_state_callback (std::function< void(float)> &&callback)
	Add a callback that will be called every time a filtered value arrives.

void	add_on_raw_state_callback (std::function< void(float)> &&callback)
	Add a callback that will be called every time the sensor sends a raw value.

void	internal_send_state_to_frontend (float state)

Public Member Functions inherited from esphome::EntityBase
const StringRef &	get_name () const

void	set_name (const char *name)

bool	has_own_name () const

std::string	get_object_id () const

void	set_object_id (const char *object_id)

uint32_t	get_object_id_hash ()

bool	is_internal () const

void	set_internal (bool internal)

bool	is_disabled_by_default () const

void	set_disabled_by_default (bool disabled_by_default)

EntityCategory	get_entity_category () const

void	set_entity_category (EntityCategory entity_category)

ESPDEPRECATED("Use get_icon_ref() instead for better performance (avoids string copy). Will be removed in ESPHome 2026.5.0", "2025.11.0") std void	set_icon (const char *icon)

StringRef	get_icon_ref () const

uint32_t	get_device_id () const

void	set_device (Device *device)

bool	has_state () const

void	set_has_state (bool state)

uint32_t	get_preference_hash ()
	Get a unique hash for storing preferences/settings for this entity.

Public Member Functions inherited from esphome::EntityBase_DeviceClass
ESPDEPRECATED("Use get_device_class_ref() instead for better performance (avoids string copy). Will be removed in " "ESPHome 2026.5.0", "2025.11.0") std void	set_device_class (const char *device_class)
	Get the device class, using the manual override if set.

StringRef	get_device_class_ref () const
	Get the device class as StringRef.

Public Member Functions inherited from esphome::EntityBase_UnitOfMeasurement
ESPDEPRECATED("Use get_unit_of_measurement_ref() instead for better performance (avoids string copy). Will be " "removed in ESPHome 2026.5.0", "2025.11.0") std void	set_unit_of_measurement (const char *unit_of_measurement)
	Get the unit of measurement, using the manual override if set.

StringRef	get_unit_of_measurement_ref () const
	Get the unit of measurement as StringRef.

Data Fields
float	state
	This member variable stores the last state that has passed through all filters.

float	raw_state
	This member variable stores the current raw state of the sensor, without any filters applied.

Protected Attributes
std::unique_ptr< CallbackManager< void(float)> >	raw_callback_
	Storage for raw state callbacks (lazy allocated).

CallbackManager< void(float)>	callback_
	Storage for filtered state callbacks.

Filter *	filter_list_ {nullptr}
	Store all active filters.

int8_t	accuracy_decimals_ {-1}
	Accuracy in decimals (-1 = not set)

StateClass	state_class_ {STATE_CLASS_NONE}
	State class (STATE_CLASS_NONE = not set)

struct esphome::sensor::Sensor::SensorFlags	sensor_flags_

Protected Attributes inherited from esphome::EntityBase
StringRef	name_

const char *	object_id_c_str_ {nullptr}

const char *	icon_c_str_ {nullptr}

uint32_t	object_id_hash_ {}

Device *	device_ {}

struct esphome::EntityBase::EntityFlags	flags_

Protected Attributes inherited from esphome::EntityBase_DeviceClass
const char *	device_class_ {nullptr}
	Device class override.

Protected Attributes inherited from esphome::EntityBase_UnitOfMeasurement
const char *	unit_of_measurement_ {nullptr}
	Unit of measurement override.

Additional Inherited Members
Protected Member Functions inherited from esphome::EntityBase
StringRef	get_object_id_ref_for_api_ () const

void	calc_object_id_ ()

bool	is_object_id_dynamic_ () const
	Check if the object_id is dynamic (changes with MAC suffix)

Detailed Description

Base-class for all sensors.

A sensor has unit of measurement and can use publish_state to send out a new value with the specified accuracy.

Definition at line 42 of file sensor.h.

Constructor & Destructor Documentation

◆ Sensor()

esphome::sensor::Sensor::Sensor ( )

explicit

Definition at line 53 of file sensor.cpp.

Member Function Documentation

◆ add_filter()

void esphome::sensor::Sensor::add_filter ( Filter * filter )

Add a filter to the filter chain. Will be appended to the back.

Definition at line 98 of file sensor.cpp.

◆ add_filters()

void esphome::sensor::Sensor::add_filters ( std::initializer_list< Filter * > filters )

Add a list of vectors to the back of the filter chain.

This may look like:

sensor->add_filters({ LambdaFilter([&](float value) -> optional<float> { return 42/value; }), OffsetFilter(1), SlidingWindowMovingAverageFilter(15, 15), // average over last 15 values });

Definition at line 112 of file sensor.cpp.

◆ add_on_raw_state_callback()

void esphome::sensor::Sensor::add_on_raw_state_callback ( std::function< void(float)> && callback )

Add a callback that will be called every time the sensor sends a raw value.

Definition at line 91 of file sensor.cpp.

◆ add_on_state_callback()

void esphome::sensor::Sensor::add_on_state_callback ( std::function< void(float)> && callback )

Add a callback that will be called every time a filtered value arrives.

Definition at line 90 of file sensor.cpp.

◆ clear_filters()

void esphome::sensor::Sensor::clear_filters ( )

Clear the entire filter chain.

Definition at line 121 of file sensor.cpp.

◆ get_accuracy_decimals()

int8_t esphome::sensor::Sensor::get_accuracy_decimals ( )

Get the accuracy in decimals, using the manual override if set.

Definition at line 55 of file sensor.cpp.

◆ get_force_update()

bool esphome::sensor::Sensor::get_force_update ( ) const

inline

Get whether force update mode is enabled.

If the sensor is in force_update mode, the frontend is required to save all state changes to the database when they are published, even if the state is the same as before.

Definition at line 63 of file sensor.h.

◆ get_raw_state()

float esphome::sensor::Sensor::get_raw_state ( ) const

Getter-syntax for .raw_state.

Definition at line 128 of file sensor.cpp.

◆ get_state()

float esphome::sensor::Sensor::get_state ( ) const

Getter-syntax for .state.

Definition at line 127 of file sensor.cpp.

◆ get_state_class()

StateClass esphome::sensor::Sensor::get_state_class ( )

Get the state class, using the manual override if set.

Definition at line 69 of file sensor.cpp.

◆ internal_send_state_to_frontend()

void esphome::sensor::Sensor::internal_send_state_to_frontend ( float state )

Definition at line 130 of file sensor.cpp.

◆ publish_state()

void esphome::sensor::Sensor::publish_state ( float state )

Publish a new state to the front-end.

First, the new state will be assigned to the raw_value. Then it's passed through all filters until it finally lands in the .value member variable and a callback is issued.

Parameters

state The state as a floating point number.

Definition at line 75 of file sensor.cpp.

◆ set_accuracy_decimals()

void esphome::sensor::Sensor::set_accuracy_decimals ( int8_t accuracy_decimals )

Manually set the accuracy in decimals.

Definition at line 60 of file sensor.cpp.

◆ set_filters()

void esphome::sensor::Sensor::set_filters ( std::initializer_list< Filter * > filters )

Clear the filters and replace them by filters.

Definition at line 117 of file sensor.cpp.

◆ set_force_update()

void esphome::sensor::Sensor::set_force_update ( bool force_update )

inline

Set force update mode.

Definition at line 65 of file sensor.h.

◆ set_state_class()

void esphome::sensor::Sensor::set_state_class ( StateClass state_class )

Manually set the state class.

Definition at line 65 of file sensor.cpp.

Field Documentation

◆ accuracy_decimals_

int8_t esphome::sensor::Sensor::accuracy_decimals_ {-1}

protected

Accuracy in decimals (-1 = not set)

Definition at line 133 of file sensor.h.

◆ callback_

CallbackManager<void(float)> esphome::sensor::Sensor::callback_

protected

Storage for filtered state callbacks.

Definition at line 128 of file sensor.h.

◆ filter_list_

Filter* esphome::sensor::Sensor::filter_list_ {nullptr}

protected

Store all active filters.

Definition at line 130 of file sensor.h.

◆ raw_callback_

std::unique_ptr<CallbackManager<void(float)> > esphome::sensor::Sensor::raw_callback_

protected

Storage for raw state callbacks (lazy allocated).

Definition at line 127 of file sensor.h.

◆ raw_state

float esphome::sensor::Sensor::raw_state

This member variable stores the current raw state of the sensor, without any filters applied.

Unlike .state,this will be updated immediately when publish_state is called.

Definition at line 122 of file sensor.h.

◆ sensor_flags_

struct esphome::sensor::Sensor::SensorFlags esphome::sensor::Sensor::sensor_flags_

protected

◆ state

float esphome::sensor::Sensor::state

This member variable stores the last state that has passed through all filters.

On startup, when no state is available yet, this is NAN (not-a-number) and the validity can be checked using has_state().

This is exposed through a member variable for ease of use in esphome lambdas.

Definition at line 116 of file sensor.h.

◆ state_class_

StateClass esphome::sensor::Sensor::state_class_ {STATE_CLASS_NONE}

protected

State class (STATE_CLASS_NONE = not set)

Definition at line 134 of file sensor.h.

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

esphome/components/sensor/sensor.h
esphome/components/sensor/sensor.cpp

Data Structures

Public Member Functions

Data Fields

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ Sensor()

Member Function Documentation

◆ add_filter()

◆ add_filters()

◆ add_on_raw_state_callback()

◆ add_on_state_callback()

◆ clear_filters()

◆ get_accuracy_decimals()

◆ get_force_update()

◆ get_raw_state()

◆ get_state()

◆ get_state_class()

◆ internal_send_state_to_frontend()

◆ publish_state()

◆ set_accuracy_decimals()

◆ set_filters()

◆ set_force_update()

◆ set_state_class()

Field Documentation

◆ accuracy_decimals_

◆ callback_

◆ filter_list_

◆ raw_callback_

◆ raw_state

◆ sensor_flags_

◆ state

◆ state_class_