My invention is a simple redstone fire alarm. This is how it works. You place a flammable block under some sand or gravel. Then you place redstone on top of it. The red stone would lead to a small room. If their is a fire, the flammable block should burn away, breaking the redstone current. You would place a redstone torch at the breaking point. So far, I can only get this to work on ground level but will keeping working on it so it can go up floors. I will put a mini one on my lot if you would like to see how it works.