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: HF32F-G-5-HS , Common – open, 10A 250VAC, 30VDC, Control 5V

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.

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

Note:

Please connect the board to sensor by wires, because the PCB and relays will generate heats!! 1-2 degree higher!!

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.

For inductive load (motor-type) alternative:

This is a generate relay board, which may restart when connected to inductive load, please use following alternative.

Added kickback EMC board near your load, this can solve the problem, but more extra wiring.

Use relay board version IL, which is specially for this, tested by us and some other customers.

Use relay board version SPDT, which the AC main power not passed through the input of the board to output, no interferance.

Package include:

Main Board

Plastic enclosure

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.)

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:

Series of ESP Relay Board:

What is the difference of this version (SPST) and SPDT version: