Hi,
Well this one is very easy. We recommand to start on your own instead of ready code. For this application you need following hardware and software.
1. 8051 developemnt board (you can design your own also)
2. Smoke detector (easily available in market)
3. Buzzer
Keil & Flashmagic Software
Algorithm for this application is mentioned here
Connect Smoke detector output on any controller pin and buzzer on another pin
Monitor that pin continuosly untill you receive signal on that.
Give signal on buzzer
That’s it…
Start it and if you have any queries, write me back….