This is my NXT Pinball Machine . I made it using one NXT2.0 kit and some assorted pieces . It was simple yet very time consuming I used the underside of LEGO plates but since the plates weren't even so I had to increase the slope of the board . You can see the launching mechanism and other parts below.
This is the launching mechanism.
Here is the ball regulator.
And here is the push-paddle mechanism .
The NXT Pinball Machine uses a light sensor and an ultrasonic sensor to detect the ball. When a ball is detected, the NXT adds one point to the scoreboard which is displayed on the NXT's screen..