we seem to lose water pressure 3-5x/yr. Annoying. I would like to install a pressure switch to the water line and have a notification sent when water pressure drops from and returns to normal. I read a thread here a while back (can’t find it now) discussing this with the suggestion of the following . . .
The pressure switch is now unavailable. Is the relay what I want? Is there another pressure switch I can use? Ideally, I’d like a ST solution, but I’ll take anything.
That’s an interesting project, and something I can see doing in my home as well.
I use a Zigbee based single relay:
That relay can be used as a momentary or regular on/off switch. So far it’s been a very reliable device using ST’s stock switch edge driver. The Zooz relay would be good too, and I believe it has an Edge driver for it from Zooz.
As for a pressure switch, I like what Paul just posted above, thanks @Paul_Oliver !
I have an eWeLink, WiFi version of the smart relay you show and and a similar Square D pressure switch both sitting in a drawer waiting for the right DYI project. And I think I just found it.
I can power the relay with and old USB camera power supply. And eWeLink integrates with ST so it should show up in ST.
So my question is: Am I just connecting the pressure switch to the NO & Com terminals on the smart relay and then putting the relay into inching mode? If not what is the correct set-up?
EDIT: After thinking this out I don’t see this working. It would work with Tuya or eWeLink smart relays that has Switch contacts, but this would require using 120 vac to power the relay.
I have one of these pressure switches, it came with my well pump. It basically detects when the pressure drops below a cut-in pressure and activates the pump. Then when a cut-off pressure is reached it turns off the pump. This is used in tandem with a pressure tank which holds the pressure that the pump builds up. My switch was pre-calibrated to be 40-60 psi. There are many videos on this on YouTube.
I’d have to wrap my head around how to use this to monitor pressure on a mains line and trigger a relay though.
These pressure switches typically have 2 adjustments.
You set the pressure when the contacts close which would start you pump in it original use. Or trigger a low pressure routine in its new use.
You can set the pressure differential which controls when the contacts reopen and the pump stops. Or in it new use it would trigger a normal pressure restored routine.
So you could set the contracts to close at 50 psi (or what ever you want in the switches range) which would trigger a lower pressure routine. And then set the differential for 20 psi (or want ever you want in the switches range). So at 70 psi (50 + 20 psi) in this case the normal pressure routine would run.
Ah yes, 100% correct! I still like the idea of the pressure switch. There’s an application I can use it at in my parents house and their water well (primary water source). Sorry for the late reply.
Thanks to you and Paul. Some followup. I’m using Z Wave instead of Zigbee. Does that matter? I have no idea what a “switch edge driver” is. Once installed, how difficult is setup?
Some devices, have their own driver instead using ST’s stock drivers. Reasons for that could be that ST doesn’t have a stock driver that works, or the vendor has added more capabilities and functions that the ST driver doesn’t have. If you end up using that Zooz device, their website and/or user manual will outline installation, and setup parameters and what each of them do.