In some cases, I have to use Zigbee. For example, I need a switch with the “short press without locking” (“momentary mode”) function.
This is convenient when implementing smart functions in household appliances. For example, supply ventilation.
• There is a problem - the “momentary mode” mode does not display the current status. You don’t know if the ventilation is working or not working.
A second sensor is required - a monitoring sensor.
In the case of ventilation equipment, a “differential pressure switch” is suitable. This sensor measures the pressure difference and you will know for sure:
- the presence of fan rotation;
- the presence of air flow;
- the presence of a clean filter.
It remains to transfer this information to the ST hub.
The simplest and cheapest option is a Zigbee door sensor. Instead of a signal from a reed switch, you send a signal from a differential pressure switch.
But we were lucky - ST hub works with Zigbee and Z-wave at the same time!
And we will take advantage of it. Yes!
There are many combined Z-wave sensors. For example, the Z-wave sensor door and temperature (well, I had one :).
• The third task is to combine the Zigbee “momentary mode” device and the “Z-wave sensor door and temperature sensor”.
This can be done by creating a virtual “Airing box” room and placing two devices there.
Now… I can automate the ventilation (according to the temperature of the room temperature sensors and the temperature sensor of the incoming outdoor air). I checked it out. It’s working.
