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this post was submitted on 11 Nov 2023
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I've had one in the humidifier tank for a few years, leaving a notification on my phone when the water tank is dry. Don't forget that these leak sensors also function as dry sensors
That setup has some wire going into the tank from the sensor because I don't think the sensors are supposed to be submerged for months at a time
Nice, love it! Check out the Tuya ZigBee water leak sensor. It runs on AAA batteries and it has a 2ft long wire with a couple of contacts on the end. I believe they are designed to be waterproof so there's no need to Jerry rig wires since they're built-in
Just a consideration on this, but would they not also use up more battery as a "dry" sensor (assuming they use batteries as the ones I have do).
For leaks, the sensor activates when water bridges the poles, which should be a rare thing. For dry, you'd be in a constant state of activation - which I presume requires passing a current through the fluid between poles - and thus consume more battery.
It activates when it's wet, "dry" is the off state.
That was a concern for me, yeah, but the reality is that I change the batteries once a year, maybe? I can't remember the last time I did it, over a year. The amount of current that goes through is very small and they only need to send current through for less than a millisecond maybe once a second. So, super low current that's only active, maybe 0.01% of the time