ok first of all its not heat or weight
sensitive its programed to recognize a finger from other object that
touch it. it uses sizing of your finger and it uses the differencial in
the pressure of different areas of your finger, to understand try to use a
foreign object on it then use a piece of paper over your finger. you
can use as many layers of paper you want therefore its not heat
sensitive yet if you put another object over the paper it will not move
because it doesn't match your fingers diminsions. now if you were to get
a fake finger that felt oddly like a real one it will work also
