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I use the cross in order to benefit from the shadow projected on each sensor. The difference between the read values from the sensors is more obvious this way hence a more accurate pointing (positioning) towards the source of light.
I've uploaded the 3D model files at STEP 1 Mechanical and Hardware files.
Hi,basically I've used a bottle with larger "neck", and it doesn't get stuck.Indeed, with smaller aperture you reduce the quantity, but you might get in trouble as mentioned above, the food will get stuck with a more narrow opening... but you can reduce the time frame from open to close.Due to bigger quantity you'll get slightly more food poring out... but I didn't follow to have a very accurate dozing system... Although, your question gives me the idea to extend this project! Thanks
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