Wifi IoT SPDT Relay Board V2




Relay Output:
  • SPDT 5 pins relay
  • Songle 10A current, Voltage 250VAC/30VDC
  • NOT connected to the AC mains.
  • Two output states: normally ON, normally OFF.
AC-DC Input Power Supply:
  • Input 65-265 VAC board voltage supply
  • Use high quality, professional and well tested power module.
Fit the case:
  • Input terminal pitch 5.08mm, Output terminal pitch 3.5mm.
  • Note the output terminal is a little bit conflict with case.

NWI1118 ESP8266 documentation please see on this page.

NWI1119 ESP32-C3 Documentation please see on this page.

Series documentation please see here.

Additional information

Weight N/A


19 reviews for Wifi IoT SPDT Relay Board V2

  1. 5 out of 5


    Very good value for money and quality.
    Many easily accessible GPIOs allow for experiments. I myself connect temperature sensors, motion sensor (GPIO15) and LCD monitor on the i2c bus. Available pins with 5V and 3.3V power supply. The system can also be powered from 5V or 3.3V. It’s very comfortable.

    Bardzo dobry współczynnik wartości do ceny i jakość wykonania.
    Dużo łatwo dostępnych GPIO pozwala na eksperymenty. Sam podłączam do niego czujniki temperatury, czujnik ruchu (GPIO15) oraz wyświetlacz LCD na magistrali i2c. Dostępne piny z zasilaniem 5V i 3,3V. Układ można również zasilać z 5V lub 3,3V. To bardzo wygodne do eksperymentów.

  2. 5 out of 5

    nardev (verified owner)

    Very compact package, similar to others but i like the SPDT option.

    Also, already soldered pins make it so easy to program.

  3. 1 out of 5


    bad board.
    and review is deleted

  4. 1 out of 5


    quality of manufactoring is below 1 star
    soldering issues, PCB wiring issues
    bad assembled components.
    no fuse.


  5. 3 out of 5

    Chao (store manager)

    Thanks for review! The fuse is the fuse resistor (not best, but really no space for big one), the wrong signal joint of the ADC pins indeed a problem, we have solved this as soon as we can, if you need use this can cut it, or please contact us for a replacement. The problem may indeed influence the signal, have a small batch has issue during optimized. Very sorry for this issue.

  6. 1 out of 5


    Fuse resistor is good, but it allows overcurrent on input wires ;(
    I figured out that it was burned when i connected sensor to ADC ( and it shortcut ground to VCC on unfixed board )

  7. 3 out of 5


    also impossible to view shematic pictures

    Access restrictions were established for this page. If you see this message, you have no access to this page.
    Retrieved from https://www.electrodragon.com/w/File:Wifi_iot_relay_board_VDC.png
    (all four files )
    please fix

  8. 3 out of 5

    Chao (store manager)

    Hi, was planning not to open anymore, but view-able for customers. It is fixed to view now, please check.

  9. 3 out of 5


    Now it working, Thank you.
    btw, if you add led lights conductor to cover case – it will be great device
    something like

  10. 5 out of 5

    Karl (verified owner)

    For over a year now I have had 12 of the VDC boards deployed with micropython running just great. Most satisfied!
    I am now testing some SPDT boards which are most promising. However I haven’t been able to get an I2C display working. I am using IO4/pin4 and IO5/pin5 and saw a comment about about cutting the 4.7K resistors. Can anyone provide some details on how to do this?

  11. 3 out of 5

    ramonlh (verified owner)

    I have 6 units, but I can not use the ADC pin. It always shows 1024.

  12. 3 out of 5

    ramonlh (verified owner)

    I have built a small plug-in module to add a Reset button, connections for DS18B20 probes (GPIO14), 2 digital inputs (GPIO4 and 5), ADC input and resistance for DS18B20.

    Up to 16 modules can be connected together in the same network and control up to 16 own or remote signals. It is only necessary to open a port on the router. From one module, the others can be controlled.

    Each module has 3 DS18B20 probes, 2 digital inputs, 2 relay outputs and 1 analog input.

    4 weekly programs, 4 programmable events, 4 programs per date, 2 scenes.

    Firmware updatable via web.


  13. 4 out of 5

    Dom (verified owner)

    Hi Karl ,
    Are you test I2C by swapping pin 4 and pin 5?
    On my SPDT boards these lines was reversed on the connector!

  14. 5 out of 5


    Bought 40 of these boards about 2 years ago and I have not had a single failure yet!
    Absolutely incredible!
    Thanks Chao!

  15. 5 out of 5

    zavhoz2015 (verified owner)

    I flashed espyeasy 2019406- works.
    when I flashed espeasy 20190409-fired up the led and stopped flashing.
    What can I do to flash the board. There is no connection and the led is on.

  16. 2 out of 5

    Loris (verified owner)

    Compact board, useful. I shopped twice.
    – resistor leg close to the connector of 220V should be isolated.
    – bigger connection on the board for the relays and bigger screw for the cables.
    – ADC shorted to another contact under the ESP8266. Thanks Tema for enlighen me.
    I realize it now that I have start using the pin that there was something wrong with it, but I had frequent reboot and ununderstandable low power wifi.
    – I wonder if I can them (at least 10) replaced with perfect one.

    Image #1 from Loris
  17. 4 out of 5

    Vincent (verified owner)

    Great device. Had it for two years, still going strong.
    My comment is that the GPIOs 4 and 5 are mislabeled on the board AND the reference photograph
    GPIO4 is GPIO5 and vice-versa

  18. 4 out of 5

    Nefi Alfonso Segarra (verified owner)

    Good product, happy with it

  19. 5 out of 5

    rt (verified owner)

    Perfect product, can be easily flashed with all ESP based application (ESP Home, EspEasy, Tasmota), pin are easily accessibles.
    Used for years and it works well.

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