Beiträge von tkalunken

  • Simple garage door opener

    Zitat
    1. Modify circuit so UNI is wired in parallel with switch, so that switch always works
    2. Configure the UNI to open circuit 500ms after it is closed (switched on)

    1. Of course the Uni should be in parallel to the wall switch. Any other way and you'd have to use the Uni *and* the wall switch to operate the garage door.

    2. In the app, under each Shelly device, there are settings for Timer, Schedule, I/O actions, and so on. Under "Timer" you'll find a setting for "Auto off". This can only be set as low as 1 second, but the garage door opener should be fine with that, just as it doesn't care if you press the wall switch for 1 second or more.

  • Simple garage door opener

    Hi,

    I haven't done any more measurements on the Shelly Uni in-circuit. But I have received the Shelly 1, and mounted it behind the garage door opener with a small 12V power supply. It works like a charm now! I'll repurpose the Uni as either a sunshine detector for the blinds or as a temperature sensor for the AC once I get to any of that.

    Thanks again for all help/suggestions!

  • Simple garage door opener

    Zitat

    Please be aware you’ll have to power the Shelly 1 with 12V DC or a suitable voltage grabbed from the door electronics! Otherwise you should use a Shelly plus 1, whose relay contacts are registered to fulfill SELV rules.

    I'm sorry, but I'm not sure I get the full meaning of this, as this is the first time I've ever come across the term "SELV rules". Are you saying that the regular Shelly 1 will not work with 220-240V AC in this application, or "just" that the Shelly Plus 1 has additional safety built-in? I was going to use 12V for the Shelly Uni, so I might as well do so for the Shelly 1 too, but I'm still curious.

  • Simple garage door opener

    Thanks for the replies for so far. The button I refer to is simply the button in the Shelly app, so the circuit itself could hardly be any simpler. No external components besides the switch, which is not even part of the circuit while the Uni is being operated.

    I appreciate the advice on other Shelly units, but hind-sight is always 20-20. I started researching the Shelly Plug S for something completely unrelated, and when I finally bought a few of those I also grabbed a Shelly Uni, which was on sale, seemed like a cool toy, and superficially also seemed to have the right spec. So it's not like I discarded the other Shelly options, I just happened to start with the Uni.

    Assuming that the problem is just the ON resistance, I'll try using the two output in parallel. I haven't checked if it possible to tie the two outputs together in the Shelly app, but it will be an interesting test regardless of the practical use.

  • Simple garage door opener

    Hi,
    I'm trying to create what should be the world's simplest Shelly Uni application, shorting two wires for about 1 second to trigger a garage door opener. I connect one set of the output leads of the Shelly Uni in parallel with a wall-mounted switch. The switch has 28V over it when open, and 20mA flowing through it when closed. As far as I can read the Shelly Uni specs (max 36V DC and max 100mA), this should be a perfect fit, and I assume that the outputs are actually MOSFETs despite a mention of "open collector outputs" somewhere. What I find strange if the outputs are indeed just MOSFETs, is that there is no mention of ON resistance?

    Anyways, nothing happens when I press the button and (presumably) short the output leads, so I'd appreciate any advice or feedback. Is there perhaps a non-obvious trick to enable the outputs at all? Or could I simply have a defective unit? Or are the outputs actually open collector after all?

    I power the Uni with 12V (Not that I see how/why that should matter, but just to come clean).

    Cheers,

    T. Kalunken ;(