Electronics and water don't usually mix - which is why liquid level sensing projects can be a little challenging. You can DIY a sensor but keeping it clean and un-oxidized can be a pain. The Optomax Digital liquid level switches are a clever solution for when you need a small sensor to detect liquid/water: super easy to use and very durable too! https://elecena.pl/product/17501524/optomax-digital-liquid-level-sensor 2021-04-07 https://elecena.pl/product/17501524/optomax-digital-liquid-level-sensor 2025-07-25