of the parallelism. APPENDIX: Air Ventilation Unit The brief specification of a new air ventilation unit would include three main subsystems: A set of 3 sensors for the measurement of heat, CO2 (Carbon Dioxide) and ozone. A fan system that can be set to High, Low and OFF. A Heating Element that
Draw an overall State Diagram to represent the Air Ventilation Unit using Harel’s UML approach. Ensure that you represent all of the parallelism.
APPENDIX:
Air Ventilation Unit
The brief specification of a new air ventilation unit would include three main subsystems:
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A set of 3 sensors for the measurement of heat, CO2 (Carbon Dioxide) and ozone.
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A fan system that can be set to High, Low and OFF.
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A Heating Element that can be set to 20o, 16o, 14o Celsius.
The system will have a control panel allowing the setting of initial values but once running the system should work automatically to control the temperature and air quality.
Standard cut-off points would be that CO2 stays between 400 and 800 parts per million. If it goes beyond 800 the fan should move to HIGH until it drops to 600.
If the temperature drops 2 degrees below its setting the heat should turn on until it is 2 degrees above its setting.
Ozone levels should be below 0.08 parts per million (ppm) again the fan should be switched on to maintain this.
Finally if after the Fan is on HIGH for 20 minutes and the ozone or CO2 have not dropped below their safe levels an alarm should sound to indicate that the room should be vacated
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