Color sorting machine

A unique spin on a classic project!!!

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The funny story is that this project was never meant to be .

About 3.5 years ago I started design a much funkier color sorting machine and like many of my projects it ended up half finished collecting dust on the window ledge (I am sure nobody else can relate to this haha) .

Long story short, a few months ago I decided to pick up this old project back up . The first thing I needed to work out was how to collect skittles from a reservoir and check their color quite reliably while keeping the system as compact as I could (which I failed to achieve the first time) . I managed talking myself into designing a simpler color sorting machine just to get the design of the collection system right . I foolishly thought It would be a 2 weekends job ,nice, easy and quick... Oh boy!!! was I wrong...

I took me 2 completely different design and many tweaked prototypes to get something that work in a acceptable manner (I am still experiencing some pick up issues from time to time) .

Even though it's not perfect I am quite pleased with the result .


The machine can be split in 2 main stages .

At the top you can find the reservoir for the unsorted Skittles . At the bottom of this reservoir is the feeding mechanism responsible for collecting skittles and positioning them in front of the color sensor where their color will be checked .

The feeding mechanism include an arm that shakes the content of the reservoir to make sure the Skittles flow nicely through the orifice of the feeding mechanism without jamming inside the reservoir ( unfortunately it still happen sometime ) .

Once the color of the skittle has been found, the second stage of the machine comes into action . The test tubes holder align the right tube in front of the feeding mechanism for the skittle to be dropped in .

The cycle can then be repeated until the reservoir is empty .


                                                   LITTLE FRENCH KEV WEBSITE


  • 1 × arduino nano
  • 1 × TCS 34725 RGB sensor
  • 3 × 220 ohm resistors
  • 1 × wires
  • 1 × 2.1x5.5mm jack plug

View all 18 components

  • 1

                                                LITTLE FRENCH KEV WEBSITE

  • 2
    PARTS .

    Once you have downloaded and printed the parts you should end up with something like this :

    Note that the front shell comes in 2 versions . No real difference they just look different .

    The rest of the parts needed .

  • 3
    WIRING .

    The wiring is pretty straight forward . Just make sure your buck converter output 5V before plugging anything to it !!!!!

View all 7 instructions

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Richard Hogben wrote 12/12/2019 at 20:55 point

Neat! Also photos and video look great.

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little french kev wrote 12/12/2019 at 21:23 point

Thanks ! I would probably finish my projects twice as fast if I wasn't spending so much time making videos and trying to take nice photos but I quite enjoy the process !! Still have a lot to learn on that front though .

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