Description Class OutdoorLightSensor

INTENTION

This class provides all definitions to describe the behavior of a outdoor light sensor. This class is derived from the description class Sensor. The following specific parameters of a outdoor light sensor are instantiated:

• the domains of the sensor
• the reaction and conversion time of the sensor

Both functions, modifyReaction and modifyConversion, have still to be provided by the domain expert.

BASE CLASSES

Class	Sensor(ENV_DOMAIN  = REAL , MEASURED_DOMAIN  = REAL , CONVERTED_DOMAIN  =  OUT_LIGHT_VALUES)

Intention

:

All definitions of description class Sensor are also provided here using the real numbers as the possible values of the phenomenon existing in the real world, using the real numbers as the possible analogously measured values, and using the values of the domain OUT_LIGHT_VALUES as the possible digitally converted measured values.

SIGNATURE

Domain	OUT_LIGHT_VALUES  = { 1 10000 }  LIGHT_VALUES

Intention	:	This domain contains the possible values measured by an outdoor light sensor.
Postreferences	:	lsref OutdoorLightSensor : Sensor
		lsref OutdoorLightSensor : lastCorrectOutLight

Timed Function	lastCorrectOutLight   OUT_LIGHT_VALUES

Intention	:	This function represents the last correctly measured value of the outdoor light intensity.
Scope	:	eh
Postreferences	:	rsref OutdoorLightSensor : R_OLS1

DOMAIN KNOWLEDGE

Property	D_OLS1

Formal	:	(  noMalSens. conversionTime = 1000 )
NL	:	The conversion time of an outdoor light sensor is 1 second.

Property	D_OLS2

Formal	:	(  noMalSens. reactionTime = 10 )
NL	:	The reaction time of a outdoor light sensor is 10 milliseconds.

REQUIREMENT SPECIFICATIONS

Property	R_OLS1

Formal	:	(  malSens. automaticDetermValue =  lastCorrectOutLight )
NL	:	The value of the sensor determined automatically in the case of a malfunction of the outdoor light sensor corresponds with the last correctly measured value.