LightSensor Units

[danward79]

Hi,

In the Home app on iOS, the units for light level are lux. I have set the unit to Percentage and the app does not change the unit and remains as lux.

Example code below

func New(baseTopic string, displayName string) *Sensor {
    acc := Sensor{
        Accessory:         accessory.New(accessory.Info{Name: displayName}, accessory.TypeSensor),
        TemperatureSensor: service.NewTemperatureSensor(),
        LightSensor:       service.NewLightSensor(),
        topic:             baseTopic,
    }

    acc.TemperatureSensor.CurrentTemperature.SetValue(0)
    acc.TemperatureSensor.CurrentTemperature.SetMinValue(-40)
    acc.TemperatureSensor.CurrentTemperature.SetMaxValue(100)
    acc.TemperatureSensor.CurrentTemperature.SetStepValue(0.1)
    acc.AddService(acc.TemperatureSensor.Service)

    acc.LightSensor.CurrentAmbientLightLevel.SetValue(0)
    acc.LightSensor.CurrentAmbientLightLevel.SetMinValue(0)
    acc.LightSensor.CurrentAmbientLightLevel.SetMaxValue(100)
    acc.LightSensor.CurrentAmbientLightLevel.SetStepValue(1)
    acc.LightSensor.CurrentAmbientLightLevel.Unit = characteristic.UnitPercentage
    acc.AddService(acc.LightSensor.Service)

    return &acc
}

Does anyone have any ideas, why the unit is not changing in iOS? I have also tried this with a custom light sensor type, with the same result.

Thanks

[brutella]

I suspect that the unit of a predefined characteristic cannot be changed – HomeKit expects lux as the unit for the current ambient light level characteristic.

Why not use a read-only brightness characteristic instead?

[danward79]

Thanks, that sounds like a sensible idea!