Here’s what you need: -ping-pong ball -bendable straw Step 1: bend the short end of the straw upward Step 2: while blowing through the straw place the ping-pong ball in the stream of air ...

Ping-pong balls have many uses: apart from playing table tennis, they have been used for countless art projects, science experiments, and even to raise ships from the bottom of the ocean. As it tur… ...

An IR sensor determines how far the ping-pong ball is from the edge of the beam. With everything wired to the Arduino, you have a pretty good testbed for a controller.