It would be interesting and very useful (it could even have other applications not only for automatic irrigation) to be able to manage automatic irrigation systems using the various current SONOFF devices; to have an ultrasonic water level meter, integrated into the eWeLink App, to place it on top of the water tank and be able to know or measure the filling volume of the tank.
Greetings.
Adolf Rupérez
To check whether the water level reaches a specific point, I simply use a float sensor attached to the cable connector and a Sonoff 05P sensor.
Of course, this only gives a zero-one indication per point and not a 1L, 5L, 10L scale of how much the tank is filling up.
When the water level in the tank is very low, I use a float switch inside the tank to prevent the submersible pump (which operates on 230V AC) from activating.
The float switch disconnects a SONOFF MINIR4 device, which powers the submersible pump. This prevents the pump from running without a load.
The MINIR4 device contains the irrigation schedule. This irrigation schedule includes some sophisticated scenes with other SONOFF devices, which I manage from the eWeLink app and my i-Host: a humidity and temperature sensor and a light sensor.
Both of these deactivate irrigation if the humidity is above a set level (75%) or if it is raining.
However, filling the tank requires a device that measures or manages the water that needs to be replenished and also controls the tank’s filling valve.
And the i-Host’s voice prompts provide updates on what is happening.
I have a similar solution. It monitors low water levels in the tank to shut off the water pump so it doesn’t run dry.
My second solution is based on two 05P units. One monitors low water levels to protect the pump, and the other monitors high water levels to prevent the tank from overflowing.
There are probably solutions on the market that measure water levels across the entire height of the tank, but nothing comes to mind right now, and they probably won’t be compatible with Sonoff/EweLink.
https://forum.ewelink.cc/t/sonoffs-alternative-to-autoaqua-smart-level-security/
Theoretically, the SONOFF Zigbee Smart Water Valve is supposed to have the ability to monitor how much water has flowed, but I don’t have it, so it’s hard for me to say.
