Water sensor for fish tanks
thingiverse
This is a water sensor I made for a friend of mine. You can hang it in a corner of a fish tank and it goes of when the water has reached a certain level. It is designed to alert at 6cm or 3cm below the edge. You will need an small switch (I got mine from an old printer), a 9V clip, a small piece of perfboard, a piezo speaker and a ping pong ball.
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