# DIY Single-level single-function water sensor **URL:** \ **Category:** Share Your Project\ **Tags:** diy\ **Created:** [July 6, 2024, 7:11am UTC](https://forum.ewelink.cc/t/diy-single-level-single-function-water-sensor/39612 "2024-07-06T07:11:36Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![morgan](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/morgan/32/3184_2.png) [@morgan](https://forum.ewelink.cc/u/morgan)\ **Post date:** [July 6, 2024, 7:11am UTC](https://forum.ewelink.cc/t/diy-single-level-single-function-water-sensor/39612/1 "2024-07-06T07:11:36Z")
A simple floating magnet and contactor($3.14) module connected via a two-wire 0.5mm cable to Sonoff DW2-RF (open version only). ![w2](https://europe1.discourse-cdn.com/flex005/uploads/ewelinkforum/original/2X/3/370d78884edf69a55b3f9c0ee8d1bb97e4d4b25d.jpeg) In DW2-RF, the contactor is desoldered… soldered wires, each wire in a separate thermoplastic sleeve with glue, the whole in an additional thermoplastic sleeve with glue. In DW2-RF, a hole is cut for the cable. ![w1](https://europe1.discourse-cdn.com/flex005/uploads/ewelinkforum/original/2X/d/dedb7fc8e90c19b738edcd3df4a94d85c10649c2.jpeg) The whole thing works on the principle that when the water level drops below a certain point, the sensor is opened and the DW2-RF sends a signal… the rest is based on scenes. I use this to turn off the water pump so that it does not run dry. ![w5](https://europe1.discourse-cdn.com/flex005/uploads/ewelinkforum/original/2X/e/edcecc2b03ad2af261940396fb151e7a956fbd12.png) ![w3](https://europe1.discourse-cdn.com/flex005/uploads/ewelinkforum/original/2X/7/72332f786c49ed9a21d71b6f42c29938f017c47d.png) ![w4](https://europe1.discourse-cdn.com/flex005/uploads/ewelinkforum/original/2X/3/3f592e891c47d3a41ddf6271a07bfc8b2edd4cad.png) ---
**Author:** ![spoustaml](https://avatars.discourse-cdn.com/v4/letter/s/a4c791/32.png) [@spoustaml](https://forum.ewelink.cc/u/spoustaml)\ **Post date:** [March 11, 2025, 7:16pm UTC](https://forum.ewelink.cc/t/diy-single-level-single-function-water-sensor/39612/2 "2025-03-11T19:16:06Z")
[I just found this on AliExpress: CZK265.67 | Ewelink Zigbee3.0 Water Sensor Alarm Water Leak Detector Flood Alert Overflow Security Alarm System Works With Zigbee Gateway [https://a.aliexpress.com/\_EyMxoKY](https://a.aliexpress.com/_EyMxoKY)](I just found this on AliExpress: CZK265.67 | Ewelink Zigbee3.0 Water Sensor Alarm Water Leak Detector Flood Alert Overflow Security Alarm System Works With Zigbee Gateway [https://a.aliexpress.com/\_EyMxoKY](https://a.aliexpress.com/_EyMxoKY)) When using this sensor, you get water animation and it also supports scene creation when the device is offline. ![Screenshot_20250311-201425~2](https://europe1.discourse-cdn.com/flex005/uploads/ewelinkforum/original/2X/f/f3f352e226510658bbf5a18068b4012021ef090b.png) ---
**Author:** ![0o0o0o0](https://avatars.discourse-cdn.com/v4/letter/0/dec6dc/32.png) [@0o0o0o0](https://forum.ewelink.cc/u/0o0o0o0)\ **Post date:** [July 6, 2025, 1:54am UTC](https://forum.ewelink.cc/t/diy-single-level-single-function-water-sensor/39612/3 "2025-07-06T01:54:22Z")
DW2-RF is unfortunately very unreliable (like all RF sensors) and such a system does not always turn off the pump… ---
**Author:** ![morgan](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/morgan/32/3184_2.png) [@morgan](https://forum.ewelink.cc/u/morgan)\ **Post date:** [July 6, 2025, 10:30am UTC](https://forum.ewelink.cc/t/diy-single-level-single-function-water-sensor/39612/4 "2025-07-06T10:30:30Z")
> [@0o0o0o0](#): > > DW2-RF is unfortunately very unreliable (like all RF sensors) and such a system does not always turn off the pump… It all depends on the strength of the signal, interference, etc. I still use one DW2-RF and works in 9/10 cases and recently I adapted 05p to this role but with zigbee there is also a risk that it can lose connectivity at a bad time. ---
**Author:** ![stephan.maritz](https://avatars.discourse-cdn.com/v4/letter/s/3bc359/32.png) [@stephan.maritz](https://forum.ewelink.cc/u/stephan.maritz)\ **Post date:** [July 29, 2025, 9:31am UTC](https://forum.ewelink.cc/t/diy-single-level-single-function-water-sensor/39612/5 "2025-07-29T09:31:18Z")
I have a float switch connected to a MiniR2 which triggers the pump accordingly. ---
**Author:** ![0o0o0o0](https://avatars.discourse-cdn.com/v4/letter/0/dec6dc/32.png) [@0o0o0o0](https://forum.ewelink.cc/u/0o0o0o0)\ **Post date:** [August 3, 2025, 5:10am UTC](https://forum.ewelink.cc/t/diy-single-level-single-function-water-sensor/39612/6 "2025-08-03T05:10:36Z")
> [@stephan.maritz](#): > > Mam wyłącznik pływakowy podłączony do MiniR2, który odpowiednio uruchamia pompę. I also think a float switch is a better solution in this case. It may not be flashy, but it’s definitely more reliable 🙂