Hello, i have a bit of a challenge when it comes to controlling the entrance gate via google assistant. instead of placing the controller at the gate itself (no wifi coverage) i am wondering if it would be possible to combine it with a video intercom and connect e.g. shelly 1 to it (or another...

Do you have a gate control connected to the panel?

Yes, everything is already connected at home. the button on the video intercom panel controls the gate (open/close).

So if I see Shelly correctly it is powered from 230V, you need something with a potential-free contact on the output.

Thanks a lot for your quick advice. Is such a voltage-free Sonoff RE5V1C (5V supply) suitable or am I limited by the 5V because I have 18v in the video intercom?

Is this 18V AC or DC? You can power the sonoff separately and connect its contacts in parallel via a diode.

DC. I also found one and this one seems to be ok? Sonoff SV 5-24V WiFi relay Voltage-free NO

8640462874 Device parameters Current consumption < 1W Input voltage from 5V DC to 24V DC Relay - load up to max 3A Output: 0V - NO relay Device dimensions : 65mm * 34mm * 12mm Operating conditions -30°C to 75°C humidity less than 95% CE - none (this is a module without an enclosure for custom applications/projects and not a final product)

Since you have 18VDC you can power the Sonoff from these, connect the output via diode to NO and COM(in parallel).

Thanks a lot for your help. Added after 33 [minutes]: .Sorry I still haven't grasped this diode connection to NO and Com. If I don't do this then the button on the panel won't work for me and the gate will only be opened via wifi/assistant? Like on this connection the button will not work ? .

Video intercom - shelly connection - google assistant control

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#1 19266321 18 Feb 2021 19:06

DomR DomR

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Post #1
19266321 18 Feb 2021 19:06

Hello,
i have a bit of a challenge when it comes to controlling the entrance gate via google assistant. instead of placing the controller at the gate itself (no wifi coverage) i am wondering if it would be possible to combine it with a video intercom and connect e.g. shelly 1 to it (or another suitable one) to the JP81 relay terminal (i am attaching a photo and diagram). Please comment on whether this can be done and possibly what to use (18v input). thank you. Regards

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#2 19266347 18 Feb 2021 19:13

sosarek sosarek

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Post #2
19266347 18 Feb 2021 19:13

Do you have a gate control connected to the panel?

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#3 19266386 18 Feb 2021 19:23

DomR DomR

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Post #3
19266386 18 Feb 2021 19:23

Yes, everything is already connected at home. the button on the video intercom panel controls the gate (open/close).
#4 19266442 18 Feb 2021 19:40

sosarek sosarek

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19266442 18 Feb 2021 19:40

So if I see Shelly correctly it is powered from 230V, you need something with a potential-free contact on the output.

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#5 19266479 18 Feb 2021 19:52

DomR DomR

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19266479 18 Feb 2021 19:52

Thanks a lot for your quick advice. Is such a voltage-free Sonoff RE5V1C (5V supply) suitable or am I limited by the 5V because I have 18v in the video intercom?
#6 19266498 18 Feb 2021 19:56

sosarek sosarek

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19266498 18 Feb 2021 19:56

Is this 18V AC or DC? You can power the sonoff separately and connect its contacts in parallel via a diode.

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#7 19266587 18 Feb 2021 20:22

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Post #7
19266587 18 Feb 2021 20:22

DC. I also found one and this one seems to be ok? Sonoff SV 5-24V WiFi relay Voltage-free NO
#8 19266643 18 Feb 2021 20:40

sosarek sosarek

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19266643 18 Feb 2021 20:40

Any auction number?

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#9 19266673 18 Feb 2021 20:49

DomR DomR

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Post #9
19266673 18 Feb 2021 20:49

8640462874

Device parameters
Current consumption < 1W
Input voltage from 5V DC to 24V DC
Relay - load up to max 3A
Output: 0V - NO relay
Device dimensions : 65mm * 34mm * 12mm
Operating conditions -30°C to 75°C
humidity less than 95%
CE - none (this is a module without an enclosure for custom applications/projects and not a final product)
#10 19266742 18 Feb 2021 21:09

sosarek sosarek

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Post #10
19266742 18 Feb 2021 21:09

Since you have 18VDC you can power the Sonoff from these, connect the output via diode to NO and COM(in parallel).

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#11 19266774 18 Feb 2021 21:55

DomR DomR

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Post #11
19266774 18 Feb 2021 21:55

Thanks a lot for your help.

Added after 33 [minutes]: .

Sorry I still haven't grasped this diode connection to NO and Com. If I don't do this then the button on the panel won't work for me and the gate will only be opened via wifi/assistant? Like on this connection the button will not work ? .
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#12 19268540 19 Feb 2021 18:58

DomR DomR

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Post #12
19268540 19 Feb 2021 18:58

Will it work with this connection? Sorry for the super diagram .
#13 19276629 23 Feb 2021 12:05

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19276629 23 Feb 2021 12:05

It will work, remember the diode.

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#14 19277505 23 Feb 2021 19:23

starob starob

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Post #14
19277505 23 Feb 2021 19:23

sosarek wrote:
It will work, remember the diode.

Could you explain in more detail why ?
#15 19277513 23 Feb 2021 19:27

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19277513 23 Feb 2021 19:27

If only to ensure galvanic separation.

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#16 19277717 23 Feb 2021 20:30

starob starob

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19277717 23 Feb 2021 20:30

sosarek wrote:
To provide galvanic separation.

Diode ?
#17 19277985 23 Feb 2021 21:43

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19277985 23 Feb 2021 21:43

@starob Well, what is the use of a relay, transformer or optocoupler here????

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#18 19278065 23 Feb 2021 22:03

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Post #18
19278065 23 Feb 2021 22:03

sosarek wrote:
connect the output via diode to NO and COM(in parallel).

I asked ... because the effect of your advice will be, depending on the direction of the 50%/50% diode connection, twofold:
1. the circuit will stop working
2. none

Draw it yourself.
#19 19282219 25 Feb 2021 20:08

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Post #19
19282219 25 Feb 2021 20:08

Hi everyone, thanks for the discussion and advice.
Managed to get everything connected and configured today (I didn't plug in that diode after all).
Sonoff SV voltage free (powered by 18v) + Supla on phone + WiFi - voice control to open/close gate via Siri or google assistant - commands in English (without using IFTTT as Supla doesn't work with it).
It works OK and I hope it stays that way.
When I find a moment I'll write a short instruction on how I connected and configured it. Perhaps someone will find it useful.

Another configuration is a Sonoff 7-32V volt-free for the garage door on the Supla (with reed switches).
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Topic summary

✨ The discussion revolves around integrating a video intercom system with Google Assistant to control an entrance gate remotely. The user seeks to connect a Shelly 1 or a suitable relay to the JP81 relay terminal of the video intercom, which operates on 18V DC. Participants suggest using a Sonoff SV relay, which can handle 5-24V DC and is voltage-free, allowing it to be powered by the existing 18V supply. The importance of using a diode for proper connection to ensure functionality of both the intercom button and the WiFi control is emphasized. Ultimately, the user successfully configures the system to operate via voice commands using Supla, without needing IFTTT.

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Video intercom - shelly connection - google assistant control

FAQ

TL;DR: Add voice control by wiring a dry-contact Wi‑Fi relay (Sonoff SV; 5–24 V DC) in parallel with JP81. "Input voltage from 5V DC to 24V DC." Power it from the intercom’s 18 V DC and use Supla for Google Assistant/Siri. [Elektroda, DomR, post #19266673]

Quick Facts

Sonoff SV accepts 5–24 V DC and provides a voltage-free NO relay rated up to 3 A, ideal for gate triggers. [Elektroda, DomR, post #19266673]
Wire the relay in parallel across the intercom’s NO and COM gate terminals to retain panel control. [Elektroda, sosarek, post #19266742]
Final build worked without adding a diode when powered from 18 V DC. [Elektroda, DomR, post #19282219]
If the panel only offers AC, power the Wi‑Fi relay from a separate 5–24 V DC source. [Elektroda, sosarek, post #19266498]
Supla enabled voice control with Google Assistant and Siri in English, without IFTTT. [Elektroda, DomR, post #19282219]

How do I add Google Assistant control to my intercom-controlled gate?

Use a low‑voltage, dry‑contact Wi‑Fi relay at the intercom. Power it from the 18 V DC line. Connect its relay to the gate trigger terminals. Then configure the relay in the Supla app and link voice control with Google Assistant or Siri. The reported setup worked without IFTTT. [Elektroda, DomR, post #19282219]

Will the intercom panel button still work after adding the Wi‑Fi relay?

Yes. Wire the relay across the same NO and COM gate terminals. This preserves the panel’s physical button operation. The working build confirmed parallel control with the intercom button and app. [Elektroda, DomR, post #19282219]

Is Shelly 1 suitable here, or do I need a dry-contact relay?

Avoid 230 V powered modules at the low‑voltage intercom panel. Use a device that offers a potential‑free contact on the output. That matches the gate trigger input and avoids bringing mains to the panel. [Elektroda, sosarek, post #19266442]

Is Sonoff SV compatible with 18 V DC gate systems?

Yes. Its stated specs include “Input voltage from 5V DC to 24V DC” and “Relay - load up to max 3A.” This covers an 18 V DC supply and typical low‑current trigger inputs. [Elektroda, DomR, post #19266673]

Do I need a diode between NO and COM when wiring in parallel?

No. A diode does not provide galvanic isolation for control circuits. The relay’s dry contacts already isolate the control side. As one expert noted, “what is the use of a relay, transformer or optocoupler here?” Keep the wiring clean and direct. [Elektroda, sosarek, post #19277985]

How do I wire this without losing the intercom button?

Use parallel wiring on the gate trigger.

Identify the intercom’s NO and COM gate terminals.
Connect the Wi‑Fi relay’s NO and COM across those same terminals.
Leave the original button wiring intact so both controls work. [Elektroda, sosarek, post #19266742]

Can I power Sonoff SV directly from the intercom’s 18 V DC line?

Yes. The module accepts 5–24 V DC, so 18 V is within range. Verify polarity and use the low‑voltage input terminals. [Elektroda, DomR, post #19266673]

What if my intercom provides only AC power?

Do not power a DC‑only relay module from AC. Use a separate 5–24 V DC supply for the relay. Then connect its dry contacts in parallel with the gate terminals as before. [Elektroda, sosarek, post #19266498]

Can I use Sonoff RE5V1C instead?

Yes. Power the RE5V1C at 5 V DC from a separate supply. Use its voltage‑free relay contacts across the intercom’s gate terminals. The intercom’s 18 V line does not need to power the relay. [Elektroda, sosarek, post #19266498]

How do I integrate with Siri or Google Assistant without IFTTT?

Add the relay to the Supla app and enable voice control integration. The reported setup worked with Siri and Google Assistant using English commands. It did not require IFTTT. [Elektroda, DomR, post #19282219]

Is this module CE‑marked and safe to install as‑is?

The referenced module listing notes “CE - none” and states it is a bare board for custom projects. Mount it in a suitable enclosure and follow local standards accordingly. [Elektroda, DomR, post #19266673]

Any tips for garage doors or position feedback?

A similar working build used a Sonoff 7–32 V volt‑free module for a garage door. It added reed switches for status and ran under Supla. [Elektroda, DomR, post #19282219]