by chibaba » Tue Nov 11, 2014 10:06 pm
for the prototype i am building, it is just going to be 2 or 3 electric bulbs in the same location.
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. If one is not present in the office and left the bulbs on, to prevent the bulbs coming on once the person returns a manual reset will be needed.