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The original was posted on /r/factorio by /u/Rahmstat on 2024-04-08 08:00:33.

I built a night detector. In the evening it trips an alarm. I made this cause I play with a pitch black night mod and thought it would be neat to get a warning that the night is coming. I have heard that some people like to adjust nuclear fuel usage at night, so maybe you guys can find some use in it!

It works by constantly pumping water to the right hand tank. There are two radars to ensure that any slight drop in power from the solar panel will cause the left hand tank to start filling as the pump can no longer maintain the level in the right.

The circuit is just a rising edge detector, so when it begins detecting that water in the right tank has dropped below some threshold, it only trips the alarm one time.

To set it up, fill the tanks to any level, then see where the right hand tank fills to when powered. Then in the decider connected to the tank, set it just beneath that number. For example, if when fully powered the right hand tank has 5.5k water, set the decider to: Water < 5.4k.

Blueprint:

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