“This entry is about the quest to get a machine to juggle a ping pong ball. I started thinking about a ping pong ball juggler 2 years ago. And it was around that time that I built the first one of them. it uses LED - Photo transistor pairs to “see” when and approximately where the ball comes down. I used 4 micro servos to move a wooden plate. It’s the machine in the first YouTube video. The next major update came when I decided it might be interesting to try to track the balls position by using the noise the ball makes when it hits the plate. I installed 4 mics and switched a FlipFlop on as soon as the sound level got over some threshold. The FlipFlop’s value then gets read by a micro controller as fast as possible to then compute the time difference between the sound waves hitting the mic on the left in comparison to the mic on the right. The same goes for the front and back mics. This way 2 dimensional data about the ball position is gathered. It worked quite well. The machine on this stage is the one in the second YouTube video.”
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