Check out this Automatic Color Sorting DIY that uses some DC and stepper motors from an old HP printer and uses Parallax’s new 32bit processor as the brain. Brilliant!

This could be great to low budget project requiring color sorting.

Once the Sensor was figured out I started to build everything. Most of the parts including the DC motor and stepper motor were taken from an old HP 712c Printer I had laying around. The carriage system for the ink head was my main platform for the sorting process to occur on. I then had to design a way to control the flow of m&m’s, this was accomplished with the idea of using a system that is commonly found in gumball machines and a coin sorting machine. I then made a CAD drawing for it to be milled by my father using a CNC machine.

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