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The optical sensors typically use an integrated IR LED, so they do not need to be in a lit environment. I'm not sure why your sensor does not recognize when the water level is raised again. Usually, the problem with optical sensors is the other way around, a droplet stays on the sensor which causes it to not recognize the level drop.Will do, thanks.
Another question... I guess the optical sensors need light to work properly? My sump area is very dark and the sensor can detect when the water drops but it does not detect when the sensor is submerged again, so that the ato pump stays on.