Wifi IoT Relay Board SPDT Based on ESP8266

(16 customer reviews)


SKU: NWI1118 Category: Tags: , , , ,


  • Based on ESP8266 Wifi IC, ESP-12F module.
  • This is the extended version of esp relay board. Flashed also the same firmware and use the same case.
  • SPDT 5 pins relay, Songle 10A/250VAC/30VDC, NOT connected to the AC mains. Three states: normally ON, normally OFF and Common pin.
  • Input 65-265 VAC board voltage supply, use professional and well tested power module.
  • Note on the relay side, terminal pin pitch is 3.5mm, still little conflict with case. Terminal pin pitch on input voltage side is still 5.08m.
  • Not including screws for less than 5 kits from December 2017 (Which cause shaky sounds inside and will trigger security failure of shipment, it significally delay shipment.)
  • Please prepare M2*8 or M2.2*6, etc crews by yourself.

Documentation please see on this page.

Additional information

Weight 0.06 kg

16 reviews for Wifi IoT Relay Board SPDT Based on ESP8266

  1. macwyznawca

    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. 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. Tema

    bad board.
    and review is deleted

  4. Tema

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


  5. Chao

    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. Tema

    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. Tema

    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. Chao

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

  9. Tema

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

  10. 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. ramonlh (verified owner)

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

  12. 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. 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. poulbran

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

  15. 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. 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.

    Uploaded image(s):

    Image #1 from Loris
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