thanks, basically what i want to do is use a sensitive pressure sensor of some kind to measure whenever something lands on it, and this would then turn on a light. I have looked at peizo electric stuff and as far as i understand although i could be wrong, they only release a signal when there is a change in pressure, while i need something that would leave the light on for the entire time something was placed on it. Also ontop of that it would be ideal if the sensor was small, around 5cm x 5cm or smaller.
Could i place a pressure transducers under a plastic sheet, and then whenever the pressure increased the resistance would change and stay that way until the pressure was removed, because that sounds ideal