The assignment was to put a sensor on something, so I put a pressure sensor on the bottom of a coaster. The red LED goes on when a) nothing is on the coaster or b) something heavier than a Blackberry is on the coaster. The green LED goes on when something the weight of a Blackberry is on the coaster.
Question: Last week, I wired it so the sensorValue started at 1024 and got smaller as the pressure sensor was pushed. This week, for some reason, the sensorValue starts at 0 and increases. Why does this happen?