Dear Mr. baron cen,

Steve is right. Hacking a cheap smoke detector is easy. Just drill a hole on the side, add a jack, solder two wires across the internal speaker and you have a state of the art smoke detector.

Now that you have a smoke detector what do you do with it? You have to tell the world when it detects smoke and a great way of doing that is using an external modem programmed to call a beeper/cellular phone. A good example of doing this can be found at "http://members.aol.com/cpu8052"

Regards,

Charles Bannister