unl-cchil / canine_precise_dispenser Goto Github PK
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License: Other
This project has the source files for the precise treat dispenser for canine cognition experiments.
License: Other
It is difficult to assemble the walls of the dispenser to the top plate, because it relies on self-threading of the screws into the 3D printed plastic. Small differences in printers can lead to this mechanism failing. Nut traps should be added to that face, like in other faces, to allow for more reliable assembly.
There is actually a much simpler design that would maximize accuracy beyond the current design. The primary mechanism you should be using is called a vibratory bowl feeder which is deceptively simple but can be used to individually dispense a large number of dog treats of any weight, shape, or size. You can 3d print one though it's simple enough that the bowl could be cold stamped in your metal of choice.
The downside is that it is slow, so you want a preparatory area that the treat will fall onto. There are different needs for different experiments, so there should be multiple preparatory area designs.
If you need the ability to rapidly dispense an unknown number of treats until moments before they are dispensed then the preparatory area could be a small conveyor belt. At the end of the conveyor belt the treats would fall to be dispensed. How to sense the treat is on the conveyor belt is an exercise left to the reader. ;)
If you know the number of treats to dispense ahead of time then you can just have them fall into a preparatory area with a load cell to count the number of treats. The preparatory area could actuate like a trap door to dispense the treats. A simple servo could accomplish this.
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