human presence and smoke detection

[chibaba]

please i need help designing my final year project.
the project is meant for an office, the prototype i am to build is meant to turn off 2 or 3 bulbs connected together once the last occupant leaves the
office. it also has a smoke detector which also turns off
appliances once it detects smoke in the office. the time
after which the appliances goes off when the last
occupant can be preset by the user from like 5 minutes to
3 hours.
The idea is that when a person enters the office, he turns
on the switches of the bulbs manually by himself but
when he leaves the office and forgets to switch off the
bulbs, the circuit takes control and switches off the bulbs
even when the switch of the bulb is ON. and when the
person returns the circuit lets go and let the bulbs come
back on as indicated by the switch position. The circuit
does nothing if the person switches off the bulbs before
leaving. it is to ensure safety.
If smoke is detected it puts of the bulbs whether one is
present or not in the office, a manual reset will be
needed before the bulbs can come on

 

[JimB]

If smoke is detected it puts of the bulbs whether one is
present or not in the office,

I know that this is only an educational project, but you may want to re-think this requirement.

What happens when it is night time and the building is full of smoke, people are trying to escape and all the lights turn OFF?
It would be much safer to turn the lights ON.

JimB

 

[chibaba]

wow thanks a lot i didnt reason along that line that would mean one electric bulb remains on while the other bulbs which are used to represent office appliances like air conditioners go off