Video of the hopper subsystem and showing how it works. The coins are dropped into the hole in the tennis can and then fall into the main part of the hopper through the shaker system. They go through the sorting subsystem one coin at a time due to the straw preventing the coins from stacking on top of each other.

Originally, I built the hopper too small and it could not hold all of the coins. I modified this design choice in my final coin sorter to improve its functionality. I also made modifications to the tennis ball can such as tilting it upwards to make the coins fall out quicker and cut out the front piece so that coins fell towards the back of the hopper.

Video of the sorting subsystem/collection subsystem and showing how they work. The sorting subsystem sorts the coins from smallest to largest (dime, penny, nickel, quarter). After the coins are sorted, they fall through the cardboard tubes into the tennis ball collection subsystem.

In the first design of the sorting subsystem, I attempted to make the holes circular in the shape of the coins. After testing, it became clear that this method was ineffective and that cutting rectangles out in the size of the coins' diameter was more accurate. The slope of the ramp was also changed throughout the builds to make the coins sort faster. The tubes connecting to the collection subsystem had to be redesigned as well to be the correct length and angle going into the tennis balls.