How can i make a fire & water alarm?

Question

please the answer should contain materials required and procedure.

Answer 1

The following examples would not be a "reliable" fire alarm system, but would work for the sake of an example. I am assuming this is for strictly educational purposes, and not to be used as an actual alarm.

Okay, disclaimer out of the way...

You basically want 2 elements, a "fire sensing element", and an "noise making element". It's probably easier to construct something to sense heat over smoke. An old thermostat set at the highest point could serve this purpose. The switch can be used to close a circuit that connects a battery to a motorized bell or buzzer. You could also consider something that a flame would quickly "burn away" such as a thread that's kept under tension (i.e. Survior television show). You'd have to get inventive so that when the thread is broke you are tripping some sort of microswitch to engage the buzzer. Maybe a spring that's held taught and when it's "released" it helps to close a switch. If you were simply trying to illustrate something that can respond with a loud noise when exposed to flame... how about an inflated balloon?

Now for part 2 of your question. How to make a water alarm?

I am not sure what you mean by that. An alarm that goes off if there is water backing up? Like if there is a backup in your basement?

If that's the case, I think a simple float switch would do the trick, mounted low on the basement wall and connected again to some sort of bell or buzzer with power fed from a battery.

Sorry if I am little vague on "water alarm", becuase I am not sure what you mean.

Good luck.

Answer 2

ask a fire and water alarms specialist

Answer 3

adt alarm system