The final stage of my rainwater filter system is a UV disinfectant. The control module has an indicator for "lamp good" and "lamp bad," but the whole thing is in a shed outside. I plan to use an ESP32 or something to monitor and alert me in case of failure.

How should I detect a failure?

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@kr4dio we have a similar need for a septic system. We have hard wired an alarm. Cannot hear the alarm from house so will also be adding a blinking light. Having said that by day two of the pump not working you can smell it from the house.

If it is in an out building an outdoor colored light woulb be nice. Or one of those airhorns from harbor freight haha

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