ALarm when water goues under a given level

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Hi @Modesty ,

these float switches aren't expensive

https://en.wikipedia.org/wiki/Float_switch

There are float switches that sense HIGH level, LOW level or both. They are built for "outdoor" use.

I use one in my drainage system that switches at a higher level than the pump. The switch is attached to a Raspberry Pi Zero in the basement and sends me an email every day so that I know it's still working and in case the level is too high an email very hour ...

Or - like suggested by @LarryD - a Float (liquid level) like this

Float (liquid level) - Wikipedia

Good luck!
ec2021

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