Using a shelly plus 1 to notify when circuit turns on

    I was wondering if the following is possible with a Shelly Plus 1.

    I have a Robus car gate opener. One feature of the Robus is that it has a GateOpenSignal circuit (NO) which sends a 24VDC current while the gate is opening - this is usually used for turning on a flashing light to signal the gate is opening. Once the gate has opened it then shuts off the circuit.

    I was hoping that it would be possible to use a Shelly 1 to send a notification when the gate opens, in other words when there is a current from the GateOpen output. The Shelly doesn’t need to do anything else.

    What I am unsure of is if this is possible with a Shelly Plus 1, and if so the correct way to wire it up (see attachment with no connections!!), or if this requires a Shelly EM

    The Robus board does also have a constant 24VDC supply output for attaching additional devices.

    Any help greatly appreciated

    Would you please provide the exact type of the door opener (e.g. ROBUS RB600P)? The issue is to evaluate if the OpenGate Signal is switching positive supply voltage to terminal "+" of OpenGate Signal or minus potential to terminal "-" of OpenGate Signal. Hopefully this would be described in the manual...

    Aleternatively, you could measure the voltage between

    terminal (+) of OpenGate Signal and terminal (-) of Constant Supply, and

    terminal (-) of OpenGate Signal and terminal (+) of Constant Supply,

    whilst door is moving.

    „Habt Geduld. Alle Dinge sind schwierig, bevor sie einfach werden!“ (aus Frankreich)

    „Nothing in life is to be feared, it is only to be understood.“ (Marie Curie, 1867-1934)

    „Es reicht nicht“, rief Schiller, „Gedankenfreiheit zu fordern, man muß auch denken können, sonst fordert man Gedankenlosigkeitsfreiheit und die ist die Freiheit zur Dummheit, welche wiederum die schlimmste Unfreiheit überhaupt ist!“
    (Aus „Besuch aus Weimar“ von Gert Heidenreich, Schriftsteller, *1944 in Eberswalde)

    The motor is an ROBUS1000 and the specific controller is the NICE RBA3-C.

    Unfortunately the manual and documentation does not specify if switching is via positive or negative so I'll need to measure the voltage as you have suggested, but that will have to wait until it stops raining (raining for the next two days non-stop!!). I'll report back when I get the measurements.

    A fortunate break in the rain so I've been able to get the readings.

    It appears that it is the negative terminal of the OpenGateSignal that is being switched.

    Reading between (-) OGS and (+) Constant is 0v when gate is closed and 24v when gate is open.

    The other option, (+) OGS and (-) Constant reads 24v in both states.

    Many thanks for your investigation!

    According to your measured values, the following sketch would be applicable:

    D4754D53-9CEF-47AE-8CE0-989058BC6C24.jpeg

    (Relay contacts of Shelly 1 were omitted)

    „Habt Geduld. Alle Dinge sind schwierig, bevor sie einfach werden!“ (aus Frankreich)

    „Nothing in life is to be feared, it is only to be understood.“ (Marie Curie, 1867-1934)

    „Es reicht nicht“, rief Schiller, „Gedankenfreiheit zu fordern, man muß auch denken können, sonst fordert man Gedankenlosigkeitsfreiheit und die ist die Freiheit zur Dummheit, welche wiederum die schlimmste Unfreiheit überhaupt ist!“
    (Aus „Besuch aus Weimar“ von Gert Heidenreich, Schriftsteller, *1944 in Eberswalde)

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