These are the insides of the three targets that we constructed.

	The alligator is the target. There is a touch sensor attached behind the alligator that senses when it is hit. The alligator moves up and down the tracks and the tracks are powered by a motor. It was tricky to code because during the same amount of time, the alligator travels a farther distance down than up. Therefore, at certain intervals, we made the tracks go up for a longer period of time than down to ensure that the alligator stayed on top of the tracks!
The pinwheel of fruits spin in a circular motion. The banana is the target and you guessed it! There is a touch sensor located behind the banana to detect when the banana is hit. This sensor was attached directly onto the motor which spun the wheel of fruits. However, it was not possible to let the fruits spin in only one direction; else the wire for the touch sensor gets tangled up. Therefore, we made the motor spin in each opposing direction for equal amounts of time.
	The squirrel, which is the target, moves in and out. You could see the touch sensor coming out behind the squirrel. This gadget is powered by a motor that turns the grey wheel (seen on the left) round and round, which in turn pulls the zig zag step-like structure in and out. As you can see, the structure for the squirrel is quite elaborate, but the program for this target was the easiest out of the three, because the motor does not have to reverse in direction.

 

This is the monkey that climbs up the tree every time one of the targets are hit! There is a reflectance sensor attached to the black rod, that detects when the monkey has reached the top.

Yukari and KiRim at Exhibition!