The Thermostat device type may be implemented using several Home API traits, but
the primary trait is Thermostat
. Following are the required and optional
traits for Thermostat devices.
Home APIs Device Type | Traits | Sample App | Use Case |
---|---|---|---|
ThermostatA device that is capable of having either built-in or separate sensors for temperature, humidity or occupancy, and allows the desired temperature to be set. A Thermostat is capable of sending heating and/or cooling requirement notifications to a heating/cooling unit (for example, an indoor air handler) or is capable of including a mechanism to control a heating or cooling unit directly. |
Required Traits matter Identify matter Thermostat |
Thermostat |
Automation API support
The following Thermostat traits and elements are supported in the Automation API.
Get the ambient temperature
Get the ambient temperature using Thermostat
To get the thermostat's ambient temperature using the
Thermostat
trait, read the
localTemperature
attribute.
Device API
// Get the ambient temperature val thermostat = home.devices().list().first { device -> device.has(Thermostat) } val thermostatTraitFlow: Flow<Thermostat?> = thermostat .type(ThermostatDevice) .mapNotNull { it.standardTraits.thermostat } .distinctUntilChanged() val localTempFlow = thermostatTraitFlow.mapNotNull { it?.localTemperature }
Automation API
val automation = automation { sequential { val starterNode = starter<_>(thermostat, ThermostatDevice, Thermostat) // If the temperature is higher than 35C... condition { expression = starterNode.localTemperature greaterThan 35 } // ...and the automation hasn't been run for at least an hour... suppressFor(Duration.ofHours(1)) // ...broadcast a message action(speaker, SpeakerDevice) { command(AssistantBroadcast.broadcast("It's very hot outside.")) } } }
Get the ambient temperature using TemperatureMeasurement
To get the thermostat's ambient temperature using the
TemperatureMeasurement
trait, read the
measuredValue
attribute.
Device API
val temperatureTraitFlow: Flow<TemperatureMeasurement?> = thermostat .type(TemperatureSensorDevice) .map { it.standardTraits.temperatureMeasurement } .distinctUntilChanged() val localTemp: Short? = temperatureTraitFlow.first()?.measuredValue
Automation API
val automation = automation { sequential { val temperature = starter<_>(thermostat, ThermostatDevice, TemperatureMeasurement) val stateReaderNode = stateReader<_>(light, DimmableLightDevice, OnOff) condition() { val expr1 = temperature.measuredValue greaterThanOrEquals 35 val expr2 = stateReaderNode.onOff equals true expression = expr1 and expr2 } action(light, DimmableLightDevice) { command(OnOff.on()) } } }
Get the average temperature using ExtendedThermostat
To get the average temperature across multiple sensors, read the
ExtendedThermostat
trait's
averageLocalTemperature
attribute.
Device API
// Get the average temperature val thermostat = home.devices().list().first { device -> device.has(TemperatureSensorDevice) } val temperatureTraitFlow: Flow<TemperatureMeasurement?> = thermostat .type(TemperatureSensorDevice) .map { it.standardTraits.temperatureMeasurement } .distinctUntilChanged() val localTemp: Short? = temperatureTraitFlow.first()?.measuredValue
Automation API
val automation = automation { sequential { val temperature = starter<_>(thermostat, ThermostatDevice, ExtendedThermostat) val stateReaderNode = stateReader<_>(light, DimmableLightDevice, OnOff) // if the average temperature is >= 35C condition() { val expr1 = temperature.averageLocalTemperature greaterThanOrEquals 35 val expr2 = stateReaderNode.onOff equals true expression = expr1 and expr2 } // Turn on the light action(light, DimmableLightDevice) { command(OnOff.on()) } } }
Get the ambient humidity
To get the thermostat's ambient humidity using the
RelativeHumidityMeasurement
trait, read the
measuredValue
attribute.
Device API
// Get the ambient humidity val humidityTraitFlow: Flow<RelativeHumidityMeasurement?> = humiditySensingThermostat .type(HumiditySensorDevice) .map { it.standardTraits.relativeHumidityMeasurement } .distinctUntilChanged() val localHumidity: UShort? = humidityTraitFlow.first()?.measuredValue
Automation API
val automation = automation { sequential { val humidity = starter<_>(thermostat, HumiditySensorDevice, RelativeHumidityMeasurement) val stateReaderNode = stateReader<_>(light, DimmableLightDevice, OnOff) // if the ambient humidity is >= 80% condition() { val expr1 = (humidity.measuredValue greaterThanOrEquals 80u) val expr2 = (stateReaderNode.onOff equals true) expression = expr1 and expr2 } // Turn on the light action(light, DimmableLightDevice) { command(OnOff.on()) } } }
Select the displayed temperature scale
To change the temperature unit of measurement that's used for the thermostat
display, set the
ThermostatUserInterfaceConfigurationTrait
's
temperatureDisplayMode
attribute to either
TemperatureDisplayModeEnum.Celsius
or
TemperatureDisplayModeEnum.Fahrenheit
.
Device API
// Set the displayed temperature scale to Fahrenheit val uiConfig = home .devices() .list() .filter { device -> device.has(ThermostatUserInterfaceConfiguration) } .first() val uiConfigTraitFlow: Flow<ThermostatUserInterfaceConfiguration?> = uiConfig .type(ThermostatDevice) .map { it.standardTraits.thermostatUserInterfaceConfiguration } .distinctUntilChanged() val uiConfigTrait: ThermostatUserInterfaceConfiguration = uiConfigTraitFlow.first()!! if ( uiConfigTrait.supports(ThermostatUserInterfaceConfiguration.Attribute.temperatureDisplayMode) ) { val unused = uiConfigTrait.update { setTemperatureDisplayMode(TemperatureDisplayModeEnum.Fahrenheit) } }
Automation API
val automation = automation { isActive = true sequential { val stateReaderNode = stateReader<_>(thermostat, ThermostatDevice, ThermostatUserInterfaceConfiguration) // When someone says "Show the temperature in Fahrenheit", val unused = starter<_>(structure, VoiceStarter.OkGoogleEvent) { parameter(VoiceStarter.OkGoogleEvent.query("Show the temperature in Fahrenheit")) } // if the temperature isn't being shown in Fahrenheit condition() { expression = stateReaderNode.temperatureDisplayMode notEquals TemperatureDisplayModeEnum.Fahrenheit } // display the current temperature using Fahrenheit action(thermostat, ThermostatDevice) { update(ThermostatUserInterfaceConfiguration) { setTemperatureDisplayMode(TemperatureDisplayModeEnum.Fahrenheit) } } } }
Change the operating mode
The Thermostat can be limited to certain operating modes, defined by
ThermostatTrait.SystemModeEnum
,
by setting the
ThermostatTrait.Attributes.systemMode
attribute, whose values are defined by
ThermostatTrait.Attributes.SystemModeEnum
.
Device API
val thermostatDevice = structure.devices().list().first { device -> device.has(Thermostat) } val thermostatTraitFlow: Flow<Thermostat?> = thermostat.type(ThermostatDevice).map { it.standardTraits.thermostat }.distinctUntilChanged() val thermostatTrait: Thermostat = thermostatTraitFlow.first()!! // Set the system mode to Auto if (thermostatTrait.supports(Thermostat.Attribute.systemMode)) { val unused = thermostatTrait.update { setSystemMode(SystemModeEnum.Auto) } }
Automation API
val automation = automation { isActive = true // When the door lock state changes sequential { val doorLockEvent = starter<_>(doorLock, DoorLockDevice, LockOperationEvent) val stateReaderNode = stateReader<_>(thermostat, ThermostatDevice, SimplifiedThermostat) // if the door is unlocked and the thermostat is in Eco mode condition() { val expr1 = (doorLockEvent.lockOperationType equals LockOperationTypeEnum.Unlock) val expr2 = (stateReaderNode.systemMode equals SimplifiedThermostatSystemModeEnum.Eco) expression = expr1 and expr2 } // Set the thermostat to Auto mode action(thermostat, ThermostatDevice) { command(SimplifiedThermostat.setSystemMode(SimplifiedThermostatSystemModeEnum.Auto)) } } }
When the thermostat is set to
SystemModeEnum.Auto
,
additional information about the running mode of the thermostat can be read from
ThermostatTrait.Attributes.thermostatRunningMode
which is populated with values from
ThermostatRunningModeEnum
.
Device API
// Get the current thermostat running mode val runningModeTraitFlow: Flow<Thermostat?> = thermostat.type(ThermostatDevice).map { it.standardTraits.thermostat }.distinctUntilChanged() val runningMode: ThermostatTrait.ThermostatRunningModeEnum? = runningModeTraitFlow.first()?.thermostatRunningMode
Automation API
val automation = automation { isActive = true sequential { val stateReaderNode = stateReader<_>(thermostat, ThermostatDevice, Thermostat) // at 10:00am val unused = starter<_>(structure, Time.ScheduledTimeEvent) { parameter(Time.ScheduledTimeEvent.clockTime(LocalTime.of(10, 0, 0, 0))) } // if the thermostat is in Auto mode and is currently cooling condition() { val expr1 = (stateReaderNode.systemMode equals ThermostatTrait.SystemModeEnum.Auto) val expr2 = (stateReaderNode.thermostatRunningMode equals ThermostatTrait.ThermostatRunningModeEnum.Cool) expression = expr1 and expr2 } // announce that it's in Cool mode action(structure) { command(AssistantBroadcast.broadcast("The thermostat is currently running in Cool mode.")) } } }
The
SimplifiedThermostatTrait
is designed to streamline the process of setting the operating mode in
automations. To change the thermostat's operating mode using the
SimplifiedThermostatTrait
,
use the
SetSystemModeCommand
,
whose values are defined by
SimplifiedThermostatTrait.SystemModeEnum
.
This trait is only available for use with the Automation API.
Automation API
val automation = automation { isActive = true sequential { // When the presence state changes... val starterNode = starter<_>(structure, AreaPresenceState) // ...and if the area is unoccupied... condition() { expression = starterNode.presenceState equals PresenceState.PresenceStateVacant } // Set the thermostat to Eco mode action(thermostat, ThermostatDevice) { command(SimplifiedThermostat.setSystemMode(SimplifiedThermostatSystemModeEnum.Eco)) } } }
To determine the system modes that a thermostat can operate in, read the
ThermostatTrait.Attributes.controlSequenceOfOperation
,
whose values are determined by the
ThermostatTrait.ControlSequenceOfOperationEnum
.
Device API
// Get the controlSequenceOfOperation val standardTraitFlow: Flow<Thermostat?> = thermostat.type(ThermostatDevice).map { it.standardTraits.thermostat }.distinctUntilChanged() val controlSequenceOfOperation: ThermostatTrait.ControlSequenceOfOperationEnum? = standardTraitFlow.first()?.controlSequenceOfOperation
Automation API
val automation = automation { isActive = true sequential { val stateReaderNode = stateReader<_>(thermostat, ThermostatDevice, Thermostat) // When someone says "Switch to cool mode", val unused = starter<_>(structure, VoiceStarter.OkGoogleEvent) { parameter(VoiceStarter.OkGoogleEvent.query("Switch to cool mode")) } // if the thermostat is capable of operating in Cool mode, condition() { val expr1 = stateReaderNode.controlSequenceOfOperation notEquals ControlSequenceOfOperationEnum.HeatingOnly val expr2 = stateReaderNode.controlSequenceOfOperation notEquals ControlSequenceOfOperationEnum.HeatingWithReheat expression = expr1 and expr2 } action(thermostat, ThermostatDevice) { // switch to Cool mode update(SimplifiedThermostat) { command(SimplifiedThermostat.setSystemMode(SimplifiedThermostatSystemModeEnum.Cool)) } } } }
Change the programming operation mode
The programming operation mode of the thermostat may be changed using the
Thermostat
's
thermostatProgrammingOperationMode
,
whose values are defined by the
ProgrammingOperationModeBitmap
.
Device API
val thermostatTraitFlow: Flow<Thermostat?> = thermostat.type(ThermostatDevice).map { it.standardTraits.thermostat }.distinctUntilChanged() val thermostatTrait: Thermostat = thermostatTraitFlow.first()!! if (thermostatTrait.supports(Thermostat.Attribute.thermostatProgrammingOperationMode)) { val programmingOperationMode = thermostatTrait.thermostatProgrammingOperationMode!! // Enable autoRecovery on the thermostatProgrammingOperationMode val unused = thermostatTrait.update { setThermostatProgrammingOperationMode( ThermostatTrait.ProgrammingOperationModeBitmap( programmingOperationMode.scheduleActive, true, programmingOperationMode.economy, ) ) } }
Automation API
// When someone says "Reset programming operation mode" val automation = automation { isActive = true sequential { val unused = starter<_>(structure, VoiceStarter.OkGoogleEvent) { parameter(VoiceStarter.OkGoogleEvent.query("Reset programming operation mode")) } // Set all the flags on the programming operation mode action(thermostat, ThermostatDevice) { update(Thermostat) { setThermostatProgrammingOperationMode(ProgrammingOperationModeBitmap(true, true, true)) } } } }
Change the temperature setpoint
To change the temperature setpoint using the
Thermostat
,
call the
ThermostatTrait.SetpointRaiseLowerCommand
.
Device API
val thermostatTraitFlow: Flow<Thermostat?> = thermostat.type(ThermostatDevice).map { it.standardTraits.thermostat }.distinctUntilChanged() val thermostatTrait: Thermostat = thermostatTraitFlow.first()!! // lower the temperature setpoint by 1 degree C thermostatTrait.setpointRaiseLower(amount = 1, mode = SetpointRaiseLowerModeEnum.Cool)
Automation API
val automation = automation { isActive = true sequential { val stateReaderNode = stateReader<_>(thermostat, ThermostatDevice, Thermostat) // At 10:00pm val unused = starter<_>(structure, Time.ScheduledTimeEvent) { parameter(Time.ScheduledTimeEvent.clockTime(LocalTime.of(22, 0, 0, 0))) } // if the setpoint is warmer than 19C condition() { expression = stateReaderNode.occupiedCoolingSetpoint greaterThan 19 } // lower the temperature setpoint by 5 degrees action(thermostat, ThermostatDevice) { command(Thermostat.setpointRaiseLower(SetpointRaiseLowerModeEnum.Cool, 5)) } } }
Prioritize a temperature setpoint
You can make a temperature setpoint take precedence over a preprogrammed
schedule by setting the
ThermostatTrait
's temperatureSetpointHold
attribute to
TemperatureSetpointHoldEnum.SetpointHoldOn
,
or have the schedule take precedence by setting it to
TemperatureSetpointHoldEnum.SetpointHoldOff
.
Device API
val thermostatTraitFlow: Flow<Thermostat?> = thermostat.type(ThermostatDevice).map { it.standardTraits.thermostat }.distinctUntilChanged() val thermostatTrait: Thermostat = thermostatTraitFlow.first()!! if (thermostatTrait.supports(Thermostat.Attribute.temperatureSetpointHold)) { // Set temperatureSetpointHold to SetpointHoldOn // allowing temperature setpoints to override any preprogrammed schedules. val unused = thermostatTrait.update { setTemperatureSetpointHold(TemperatureSetpointHoldEnum.SetpointHoldOn) }
Automation API
val automation = automation { isActive = true sequential { // When someone says "Prioritize thermostat setpoint" val unused = starter<_>(structure, VoiceStarter.OkGoogleEvent) { parameter(VoiceStarter.OkGoogleEvent.query("Prioritize thermostat setpoint")) } // make temperature setpoints override any preprogrammed schedules. action(thermostat, ThermostatDevice) { val unused2 = update(Thermostat) { setTemperatureSetpointHold(TemperatureSetpointHoldEnum.SetpointHoldOn) } } }
Set
ThermostatTrait.Attributes.temperatureSetpointHoldDuration
to control how many minutes a setpoint hold is active.
Device API
val thermostatTraitFlow: Flow<Thermostat?> = thermostat.type(ThermostatDevice).map { it.standardTraits.thermostat }.distinctUntilChanged() val thermostatTrait: Thermostat = thermostatTraitFlow.first()!! if (thermostatTrait.supports(Thermostat.Attribute.temperatureSetpointHoldDuration)) { // Set the setpoint hold duration to 60 minutes val unused = thermostatTrait.update { setTemperatureSetpointHoldDuration(60u) } }
Automation API
val automation = automation { isActive = true sequential { val stateReaderNode = stateReader<_>(thermostat, ThermostatDevice, Thermostat) val unused = starter<_>(thermostat, ThermostatDevice, Thermostat) // if the temperature setpoint hold duration is less than 60 minutes... condition() { expression = stateReaderNode.temperatureSetpointHoldDuration.lessThan(60u) } // ...and the automation hasn't been run for at least 24 hours... suppressFor(Duration.ofHours(24)) // ...set the temperature setpoint hold duration to 60 minutes action(thermostat, ThermostatDevice) { val unused2 = update(Thermostat) { setTemperatureSetpointHoldDuration(60u) } } } }
To change the temperature setpoint hold policy, which determines how and when a
thermostat Hold state ends, call the
ThermostatTrait.SetTemperatureSetpointHoldPolicyCommand
.
Valid values are determined by
TemperatureSetpointHoldPolicyBitmap
.
Device API
val thermostatTraitFlow: Flow<Thermostat?> = thermostat.type(ThermostatDevice).map { it.standardTraits.thermostat }.distinctUntilChanged() val thermostatTrait: Thermostat = thermostatTraitFlow.first()!! if (thermostatTrait.supports(Thermostat.Attribute.temperatureSetpointHoldPolicy)) { // Set the temperature setpoint hold policy to holdDurationElapsedOrPresetChanged val unused = thermostatTrait.setTemperatureSetpointHoldPolicy( ThermostatTrait.TemperatureSetpointHoldPolicyBitmap( holdDurationElapsed = false, holdDurationElapsedOrPresetChanged = true, ) ) } val automation = automation { isActive = true sequential { // When someone says "Set my preferred hold duration", val unused = starter<_>(structure, VoiceStarter.OkGoogleEvent) { parameter(VoiceStarter.OkGoogleEvent.query("Set my preferred hold duration")) } // set the temperature setpoint hold policy to holdDurationElapsedOrPresetChanged action(thermostat, ThermostatDevice) { command( Thermostat.setTemperatureSetpointHoldPolicy( TemperatureSetpointHoldPolicyBitmap( holdDurationElapsed = false, holdDurationElapsedOrPresetChanged = true, ) ) ) } } }