Several months ago I did another post on this, but it turns out it had significant problems due to galvanic corrosion. The solution seems to have been to switch from a DC circuit to an AC circuit. I've left that post around for reference, but this posting otherwise replaces it.
We have a below-grade basement. We have a sump, but we've had problems with the pumps, or more precisely, the pump switches. Note the use of the plural: several years ago we installed a second pump on a separate switch, but we have still had both of them fail.
So, I decided to build a monitor for the sump to measure both the height of the water in the sump and when (and if!) the pumps turn on. This needs to be able to send us alerts when something goes wrong, and may give us an idea of whether our sumps should be upgraded to something higher power.
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