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Connecting Tuya WiFi Switch to VEVOR ZTGD800 Garage Door Button Terminals

rfa_rafal 2547 20
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  • #1 21513810
    rfa_rafal
    Level 3  
    Good day,
    I want to connect (wire/solder) a garage door Wi-Fi switch (e.g. Tuya).
    I would like to connect to the opening and closing buttons. I have included a picture of the buttons below.
    Is this possible? Please give me suggestions.
    Close-up of a circuit board with marked buttons for opening and closing. .

    Model ZTGD800, company VEVOR.
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  • #2 21513834
    bubu1769
    Level 43  
    And the gate controller doesn't have a dedicated input for controlling the gate with a single pulse?
    Please specify what model of this controller you have.
  • #3 21513878
    rfa_rafal
    Level 3  
    Model ZTGD800 by VEVOR
  • #4 21513885
    bubu1769
    Level 43  
    Well, according to the manual, page 82, you have a dedicated input under which you can connect an external control, a GND and KEY connector.
    Only the relay has to be voltage-free, dedicated to such applications.
    Attachments:
    • 2fb38d.pdf (3.88 MB) You must be logged in to download this attachment.
  • #5 21513897
    rfa_rafal
    Level 3  
    WoW, great.
    As soon as I get home, I'm acting.

    Thanks, I'll return the favour somehow :-)

    Added after 9 [hours] 45 [minutes]: .

    At the top I have an output for a "wall switch", just which one is it? ( 1 or 2 )
    Those inputs at the bottom are the photocell and the battery....

    Close-up of an electrical panel with two marked connectors. .

    ... and now if 1 or 2 then they open/close, and the wall switch or this wifi switch of mine must have power given to it (phase and N) ?
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  • #6 21514603
    bubu1769
    Level 43  
    These are the jumpers from the photocell, don't touch that.
    Don't you have a connector on the motherboard like the one shown in the manual?
    The wifi relay must of course be connected to the power supply, but as I wrote earlier it must be a relay designed for such a function, i.e. with a voltage-free contact.
    The best thing to do is to give a photo of the relay you have.
  • #7 21514627
    rfa_rafal
    Level 3  
    Close-up of an electronic circuit board with multicolored wires connected to terminals. .

    According to the manual gnd and key are used for the switch, only that the key is empty (solder in?).
    In my case behind the picture the first two wires on the right are connected to the photocell, the gk one to Red.

    Close-up of an electrical connector with a label describing various connections. .

    Wi-Fi switch I don't have yet (I have a few for switching lights and roller blinds)
    Two smart switch modules with labels and connectors on the surface.
  • #8 21514643
    bubu1769
    Level 43  
    This means you have a different version of the board.
    You can check if this KEY input works at all by short-circuiting it with a piece of wire to GND, it is possible that there are some elements missing on this KEY line to make it work.
    The relays you have without modification will not be good for controlling this gate.
    If it turns out that the KEY input is not active, this roller shutter controller could be connected to the buttons so that it controls the gate, but you will have to modify the connections inside the wi-fi relay or add external relays.
  • #9 21514663
    rfa_rafal
    Level 3  
    There is success! :-) .
    Short circuit GND and KEY closes/opens.
    Ordinary WiFi switch or for roller shutter gates?

    You will need to solder to the KEY, I understand, and connect to the switch.
    Thanks a lot!!!
  • Helpful post
    #10 21514678
    bubu1769
    Level 43  
    The relay must have a voltage-free contact.
    Something like this:
    https://allegro.pl/oferta/przekaznik-wifi-sterownik-beznapieciowy-tuya-smart-15092189267


    For gates there are also special relays with a sensor so that the application shows whether the gate is closed
    For example such a one:
    https://allegro.pl/oferta/sterownik-bramy-garazowej-wifi-tuya-smart-16927080345
  • #11 21514691
    rfa_rafal
    Level 3  
    Thanks a lot!
    If you will be in Poznan, you are welcome :}

    Seriously, a big thank you.
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  • #12 21776300
    robertke
    Level 7  
    Witam Panowie
    Mam ten sam problem, sterowniki dokładnie taki sam. Chce zrobić przycisk na ścianie do otwierania bramy.
    Tylko nie wiem gdzie podłączyć przewody do tego sterownika. Z tego co przeczytałem rozumiem że muszę przylutowac przewód do KEY oraz do GND ( ewentualnie połączyć kablem GND).
    Jak polacze te przewody brama będzie się otwierała / zamykała?
    Jeszcze jedno pytanie mówimy o GND i KEY które znajdują się na 2 i 3 miejscu od początku płytki. Bo zaraz obok jest drugie GND i KEY. Z góry dziękuję za odpowiedź
  • #13 21789417
    pioterek22666
    Level 1  
    I bought a similar piece of equipment and was also looking for answers on how to hook up to the control signal. What I did by the non-invasive method was to plug in with two pins to the plug, I assume from the remote control module? (the one on the left next to the "Key" field). To be sure, I shorted the lead-out pins to each other to make sure it worked, and plugged in the plug from the battery, which I have no intention of installing anyway (there is now one plug on top of the other). This gave me a lead outside to plug in the Wi-Fi module.
  • #14 21790832
    robertke
    Level 7  
    Czesc
    pioterek22666 a mozez wrzucic jakies zdjecie - co ty zrobileś, bo z Twojego opisu trudno coś sie domyslic
  • #15 21794149
    rfa
    Level 1  
    >>21776300
    Hello.
    There are two cables to connect from the board (looking from the top) - it says "wall switch". Just plug into them, or "split" them and pull a button from one pair and plug a WiFi or Zigbee controller into the other pair.
  • #16 21796207
    boryshoroneskul
    Level 1  
    Hello!
    I wanted to link to the topic of this drive. As you can see, there are already newer models with a slightly different control board.
    I have a question about the self-closing. Is it possible to adjust the timing somehow? Because from the keys it looks like you can only turn it on/off?
    Best regards!

    In my case, for pulse control there is that white terminal with the wires you see in the picture. Short-circuiting these outputs works - closes, opens, stops.
    I am trying to attach a photo:

    Connecting Tuya WiFi Switch to VEVOR ZTGD800 Garage Door Button Terminals
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  • #17 21808790
    silvaelio
    Level 2  
    Hello All. I have board and I would lke to conect photocell, but I don't where to connect output ports from receiver of photocell. The other question is about jumper for photocell that seems that mine board don't have. Do you know how can be find that jumper.
    Thank you in advavce.

    Control board with indicator showing where to connect photocell receiver
    Attachments:
    • Connecting Tuya WiFi Switch to VEVOR ZTGD800 Garage Door Button Terminals esqueme.jpg (271.43 KB) You must be logged in to download this attachment.
  • #18 21809134
    robertke
    Level 7  
    Czesc
    Do czego ci potrzebny czas otwierania bramy?
    - Jak ustawisz bramę to ustawisz do jakiego momentu ma sie otwierać i do jakiego mometu ma sie zamykac .
    - Dodatkowo mozesz ustawić po jakim czsie ma sie sama zamknąć ( bardzo dobr funckcja, - nie musiz zamyć samo sie zakmnie po kilku minutach).
    Ja dorbiłem siobie przycisk na scianie i moge nim otwierać i zamykc i dzial to tak samo jak bym przyciskal pilotem .

    Załacze zdjecia gdzie trzeba wlutowac kable jeden do GDN drugi do KEY
    Close-up of circuit board with wires, connectors, and LM317T voltage regulator Main circuit board with connected wires and highlighted connector section Close-up of a circuit board with relays, wires, and connectors
    https://obrazki.elektroda.pl/1017570900_1768434822.jpg
    https://obrazki.elektroda.pl/9417852000_1768434822.jpg
    https://obrazki.elektroda.pl/1718930300_1768434822.jpg
  • #19 21809368
    silvaelio
    Level 2  
    I'm sharing the wiring diagram for the motor boards:
    VEVOR ZTGD1000 ZTGD800
    SROMMA 600
    RT800 RT1000.
    I did a lot of research and couldn't find a complete diagram, so I did some testing at home with what I had and arrived at this wiring diagram which is working. It has options for a wall switch, options to add a Shelly to open the gate by phone, and I also added the complete diagram for connecting photocells.


    Control board with connections for power, wall switch, and photo sensors
    Garage door opener with a rail section visible in the lower right corner
  • #20 21810104
    robertke
    Level 7  
    Super to pokazałeśc.
    Ja zrobiłem dokladnie tak samo , poza fotokomurkami, ale chyba odrazu dorobie sobie kabel to bedzie juz gotowe by kiedys podłaczyc.
  • #21 21821780
    robertke
    Level 7  
    I have to disagree with Silvaelio - with me such a connection does not work.
    I solved it in the following way
    Wiring connections between photocells and gate actuator control board

    1. Connect the 24V voltage (+ and -) to one and the other photocell - in the actuator preferably to the battery input.
    2. Let's connect the photocell control cables to GND (it doesn't matter where we plug into GND - it's easiest in the RED approach).
    We need to connect the other control cable to STOP and this is where we need to solder in.
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Topic summary

✨ The discussion addresses connecting a Tuya WiFi switch to the VEVOR ZTGD800 garage door opener's control terminals. The ZTGD800 features a dedicated external control input labeled GND and KEY, designed for voltage-free relay contacts. Testing confirmed that shorting the KEY input to GND triggers the door open/close function, indicating the input is active. The WiFi switch relay must have a voltage-free (dry) contact to safely interface with the garage door controller. Standard WiFi relays for lighting may require modification or additional external relays to be compatible. Photocell jumpers and battery terminals should not be altered. Recommended are specialized voltage-free WiFi relays compatible with gate control, some with integrated sensors for gate status feedback. Proper power supply connections (phase and neutral) are necessary for the WiFi relay operation.
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FAQ

TL;DR: To add Tuya control, use the ZTGD800’s 2‑wire dry contact (GND+KEY); “it must be a relay designed for such a function, i.e. with a voltage‑free contact.” [Elektroda, bubu1769, post #21514643]

Why it matters: This FAQ helps DIYers safely connect a Tuya Wi‑Fi switch to a VEVOR ZTGD800 without damaging the board or sensors.

Quick Facts

Which terminals do I use to connect a Tuya Wi‑Fi switch to the VEVOR ZTGD800?

Use the dry-contact pair labeled GND and KEY. A momentary short between these two toggles the door. This was verified by shorting them, which opened and closed the door. Wire your Tuya relay’s normally open contacts across GND and KEY only. [Elektroda, rfa_rafal, post #21514663]

Do I need a voltage‑free (dry‑contact) relay on the Tuya side?

Yes. Use a relay that provides an isolated, voltage‑free contact. Do not output any voltage into KEY. As one expert put it, “The relay must have a voltage‑free contact.” This protects the controller and ensures reliable toggling. [Elektroda, bubu1769, post #21514678]

Can I test the input by shorting GND and KEY with a wire?

Yes. Briefly touching GND to KEY simulates a wall-button press and should toggle the opener. A user confirmed success with this exact test on the ZTGD800. Use this test to confirm the input before wiring your Tuya relay. [Elektroda, rfa_rafal, post #21514663]

My board’s KEY pin looks empty. Can I solder to it?

Yes. Some ZTGD800 boards ship without the KEY header populated. You can solder a lead to the KEY pad and another to GND, then land your relay there. Inspect carefully and avoid bridges. [Elektroda, rfa_rafal, post #21514627]

Where should I not connect the Tuya relay? Are the bottom jumpers OK?

Do not touch the photocell jumpers at the bottom. Those are for safety beam wiring, not for a wall switch or Tuya relay. Miswiring there can disable safety features or cause faults. Use only the GND and KEY dry-contact input. [Elektroda, bubu1769, post #21514603]

Does the Tuya Wi‑Fi module need its own power?

Yes. Power the Tuya relay per its datasheet (mains or low-voltage, depending on model). Only the relay’s dry contacts go to GND and KEY. Never inject any voltage into the KEY input. [Elektroda, bubu1769, post #21514643]

What if the KEY input doesn’t respond on my board?

Boards differ. One version lacked some parts on the KEY line. First, test by shorting KEY to GND. If inactive, drive the existing front‑panel buttons with your relay or add external relays to adapt your module’s outputs. [Elektroda, bubu1769, post #21514643]

Can I use a Tuya roller‑shutter module instead of a dry‑contact relay?

You can, but you must modify connections or add external relays to present a clean dry contact. Without that, the module may output voltage and damage the opener. Dry-contact Tuya relays are simpler. [Elektroda, bubu1769, post #21514643]

Are there Tuya garage controllers that show if the door is closed?

Yes. Tuya garage-specific controllers include a door-state sensor so the app shows closed/open status. This adds convenience and verification without extra wiring complexity. [Elektroda, bubu1769, post #21514678]

Does the ZTGD800 have a dedicated single‑pulse input for external control?

Yes. The manual references a dedicated input pair (GND and KEY) for external control. Wire a momentary, voltage‑free contact across that pair to toggle open/stop/close behavior. [Elektroda, bubu1769, post #21513885]

How do I wire a wall push‑button to the ZTGD800?

Use a simple momentary, normally open button. Connect one lead to GND and the other to KEY. Pressing it shorts the two and toggles the door, the same as the Tuya relay does. [Elektroda, rfa_rafal, post #21514663]

I see two KEY/GND groups—which pair should I use?

Use the pair associated with the wall-button input. One user noted KEY and GDN at the 2nd and 3rd positions from the board edge. Confirm by a quick short test; the active pair will toggle the door. [Elektroda, robertke, post #21776300]

Quick how‑to: connect a Tuya dry‑contact relay to ZTGD800

  1. Power the Tuya relay from its rated supply (not from KEY).
  2. Identify GND and KEY; briefly short to confirm toggling.
  3. Wire the relay’s NO and COM across GND and KEY; leave coil/logic isolated. [Elektroda, bubu1769, post #21514643]

Is it safe to feed mains into KEY to make it work better?

No. KEY expects a dry contact only. Feeding mains or low-voltage power into KEY risks board damage. Keep KEY isolated and use a voltage‑free relay. [Elektroda, bubu1769, post #21514643]
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