Simple Automatic Fish Feeder

This is a simple automatic fish feeder built using some cheap components I originally had lying around from previous projects. This design works well with food pellets, but feel free to try it with other forms of food. The feeder should be a perfect fit for aquariums with rimless 4mm glass walls. If you have this [5-gallon aquarium](http://a.co/4omzEPr) like I do, you should be golden.

(Demo video: https://youtu.be/mi4jcUzdbd0)

__Servo__

The center slot is designed to friction-fit an SG90 servo that spins the food rotor, but I would recommend some sort of extra anchoring (I used hot glue since it can be removed). As far as servos go, I had the 180-degree-limited servo left over from my first Arduino Uno kit from Vilros. To convert it to a continuous servo, I performed [some modifications](https://learn.adafruit.com/modifying-servos-for-continuous-rotation/overview). However, if you can spare $7.50, just get the purpose-made [continuous servo in the same form factor](https://ww