I am doin an assignment for college please help me!!!!!!!?

I would suggest refining your specification so that it reaches a temperature of 70 degrees, sounds a whistle and flashes a light, holds the temperature for a short time (One minute?), then switches off, while flashing a warning light while it's still hot.
Anonymous looking HOT devices are a safety hazard, especially in a domestic environment.

David Clark
February 2006