Wifi IoT Relay Board Based on ESP8266 R1.1 Maximize

Wifi IoT Relay Board Based on ESP8266 R1.1

It is based on price competitive wifi module ESP8266. Available with the standard software as described below or with our software which allows a web configuration and works perfectly with IoT Manager for Android and iOS.
An unlimited amount of these modules can be used to control electrical appliances.

More details

Online only

7,65 €

Product From (qty) Discount
Wifi IoT Relay Board Based on ESP8266 R1.1 2 -10%

Product Description

The purpose of this design is for learning how to play with the hardware and software of a IOT project, it is based on price competitive wifi module ESP8266.

Hardware Features

  • Based on ESP-12F ESP8266 Wifi Board
  • This relay board use one AC input, and supports two relay AC output. Please note the output AC power comes/connected from/with input AC power. Relay only play as on/off switch for AC power. Will be danergerous to use in any other cases.
  • Use mature AC-DC power module, input volatge 85 – 265VAC
  • Relay Specification: Songle Relay, 125VAC 10A, 250VAC 10A, 10A 30VDC, 10A 28VDC
  • Plastic enclosure design support, package includes the PCB board, plastic case, and self-drilled screws (screws are not assembled). Case general dimension is 111*42 mm.
  • Two Lead out buttons BTN1 and BTN2
  • Two relay indication LEDs
  • One status LED, indicating connecting status in demo code
  • A few lead out pins, from top (left) to bottom (right):
  • Resevered design for temperature sensor DHT22
  • Screw terminal which are easy for wiring output.


  • Configuration using Web-Interface
  • MQTT
  • No programming skills needed
  • Works perfectly with IoTmanager for Android and iOS

Demo Software Features

  • Programming skills need, not recommended for unfamiliar user.
  • The board flashed with demo test code, you can follow the youtube video to make a try directly. And find demo code in the wiki page below. Only nodemcu demo code avaialble.
  • The demo code written in R1.1 will do:
    • switch both relay on/off once per second, and wait for smart config
    • When connected to local wifi by smart config, on/off switching relay will stop and you can use mqtt to control it, follow wiki instruction for further details.
  • You can use USB-TTL debug to re-program it. (Search to buy a USB-TTL tool in case, PL2303 or CP2102 can be all the work)
  • If you want to customize it, please contact via info@electrodragon.com
  • Use MQTT platform called www.cloudmqtt.com, use-friendly for esp8266
  • Based on NodeMCU LUA coding
  • Demo code available, open source, and support smartconfig and MQTT, please find the code below or at our dropbox page to download

Updated version R1.1:

  • Fix isolation and current drop issue on old version, which cause the ESP-wifi board may have a 5% chance to reset/restart when you switch relays On/Off very very frequently.  R1.1 version is not absolutely can be eliminated this issue since the onboard AC-DC module has a limit, but the probability of this problem should be controlled to the least, low to one percent.
  • Maximum trace design for current passing, 2MM trace width to let 2A current pass through roughly for two relays together, so either 2A for running one channel device or 1A for two device. also open trace without soldermask, you can add more solders to get even higher current passing.


  • The board has exposed high voltage AC connection, be very carefully on this.
  • Please notice the two relay output terminals are a little conflict with case, second channels need to use soft wires or remove the screw installation bars manually.


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