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nice prototype! If you want to make a usable version the following might help.If you connect a reed switch to the connectors of a water alarm sensor you have a similar effect.Conrad in Germany is just selling reduced water alarms fuer some 2,40 Euro.They include buzzer, housing, battery...https://www.conrad.de/de/wassermelder-mit-internem...(I made a similar project with them using a microprocessor because I wanted to have a delayed and "growing" alarm)
I'm working on a similar project. Do you have any experiences how long the batteries last? The ESP-01 is not able of going into deep sleep mode (without hardware modifications) so it needs power all the time...
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