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Do you have any ideas how to make a ping-pong ball launcher that reloads automatic and shoots automatically?


Air cannon is probably the simplest, PVC pipe from Home Depot and shoots things very far, can make any size you want, need a tire pump or air compressor to power it. It is also called Potato Cannons for obvious reasons. I shot a potato over 1000 feet with 60 psi and 2" pipe.

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What are encoder and the decoder? What are the uses of these two devices? Also, write about how it works with circuit diagram.Is it possible to build an AC or DC variable-speed generator with a variable field current, controlled by a signal from a torque sensor connected to the shaft of the generator (i.e., net torque = 0)?