I have got to start stop motor from a smoke alarm ill send moneyif u can help
for project by 9 am

 

*disclaimer: if electronics knowledge where height, i would be the dwarf around here.*

That said, i think you could use a op-amp like the 741 as a comparator to sense the speaker on the smoke detector.

Then use a diode protected mosfet to power the motor from a separate battery.

Honestly tho, if this project has lives depending on it..i suggest you abandon it now

Best of luck

-luvv-