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Message: <blockquote data-quote="bigone5500" data-source="post: 163079" data-attributes="member: 6064">I also worked on my aerator timer control. I built it from an arduino pro mini, relay board, and re-purposed car charger. The original timer doesn't work any more and a new one is $40. I had this stuff already and all I needed to do is write the code for the board to work its magic. 3 selections: 1- aerator on 1 minute off 10, 2- on 1 minute off 7, 3- on 1 minute off 5. This will keep different amounts of fish alive by supplying them with fresh water. Ex: 5 fish will not need fresh water as often as 30 fish.I actually didn't write the code. I wanted to learn how but a guy posted an awesome sketch that works just as intended.</blockquote>