Perler Beads Sorter Using Color Sensor ISL29125
Today I made some tests with my perler beads sorter prototype. Here I have two videos of the tests.
The first video is made so, that I added one bead at a time to the sorter to show how the first parts of the sorter are working. To get reliable results of the colors, the beads must be moved under the color sensor always in the same (upright) position. That’s why the first parts of the sorter seem somewhat complicated.
The second video clip is starting with about 30 beads in the sorter’s first cup. After reading the color of a bead, the sorter puts the bead to the correct box according to bead’s color. The first bead will always be put to the box in the middle. The second bead, if its color is different from the first bead’s color, goes to the box to the left of the first bead’s box. The third bead, if its color is different from the former ones, will go to the box to the right side of the box in the middle. This way it continues, until there are no boxes left. If there still comes a bead with a different color as of the former ones, then the bead is put to the 7th box. And the same Is done for all the rest of the beads, which have a ‘new’ color compared to the colors of the former beads.
This sorter prototype is sorting the small perler beads. Because the beads are so small, it is a little difficult to get reliable color readings from the color sensor. The beads must come always at the upright position under the color sensor. To make the color readings even more reliable, I glued a little bead around the color sensor chip to make It see only the head of the bead and not the surroundings. The lighting for the sensor is made with four white LEDs.
The color reading works perfectly, and so does also the delivery to the correct boxes. Turning the beads to upright position works also mainly well. Feeding the system, which is moving the beads under the color sensor, is not working well. The beads stuck often and stop to move. In the upper cup there is a servo with a kind of a whisk, which is trying to solve the stuck problem. That doesn't always succeed, anyway. So I don’t recommend to do the most upper part of this kind of a sorter in this way. Sometimes, and rather often actually, the whisk throws a bead or two out of the cup. This could be solved with a lid.
So, this Is just a slow prototype and not a ready-made product. It was fun to make it though. The sorter has about 20 3d-printed parts, which I designed with OnShape. I think, I won’t continue developing this further, but if I will, I’ll make a new video.
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