This was one was completed by a GCSE Electronic Projects student.
He had an idea to make a display to advertise a product…. In this case it was a brand of deodorant.
The project used a Can of the Deodorant which was placed securely onto a base. The top of the can was pressed down by using a rotating Cam connected to a worm gear motor. As the cam rotated, it squirted a small amount of deodorant into the air, allowing passers by to sample the fragrance.
The motor was powered by a microcontroller connected to a Passive Infra Red (PIR) sensor so that it detected the movement of someone passing by.