ESP8266 1 channel relay module - Erratums/ESP8266 GitHub Wiki

About Relay Module

This is an esp8266 based relay module.
Wide voltage input, input voltage: DC 7V - DC 25V
Input overvoltage protection, input with TVS, voltage exceeding 33V, automatic protection
Input overcurrent protection
220V 10A relay, one normally open, one normally closed
It's using Optocoupler
5v working voltage

Power the device with 12v [DC] power supply
Once it's ON, you will notice a new WiFi network ES-1CH-Relay, connect to that network using password trytest123
Once connected, use your browser [Google Chrome] and go to 192.168.4.1 [there is a chance the IPAddress is different]
From this page
- You can control the device with Turn On and Turn Off buttons
- You can configure your WiFi router Name and Password here
- You can set the Topic Name here. This should be a unique Name which should be used to control device remotely from our server here
- To use topic name use above link with parameter topic. Sample is here
Please Note: It is not possible to change the Hotspot name or password without Reprogramming Device with Sample MQTT code

If you don't know how to install ESP8266 into Arduino IDE, please refer this link
How to install ESP8266 in Arduino

If you don't know how to program ESP01S, please refer this link
How to program ESP01S

Note: Closing the Jumper will boot the Module in Programming Mode

- To program module [ESP8266], we need to close the jumper [P3] 
- as shown in the below Image

+ For normal use, just open or unplug the jumper

USB to TTL converter. You can buy it here.
External Power Supply [Tested with 12v]
To program the board, we need to close the jumper P3. You can see in the below image
Connect the power supply to board
Connect Rx/Tx to Tx/Rx of TTL converter
Connect ground of board to ground of TTL converter
No need to connect Vcc to TTL converter. We are already using external power supply
Connect TTL converter to computer and upload the code

Select board type ESP8266 Generic

You can get sample code from our Github repository

This is a simple code using which you can control the relay via device WiFi Hotspot
Once the code is uploaded, turn off the module and remove the boot jumper power on relay module
You will notice a new WiFi network ES-1CH-Relay, connect to that network using password trytest123
Then use your browser [Google Chrome] and go to 192.168.4.1 [there is a chance the IPAddress is different]
You will see the page as below. You can control the relay through this page

If you don't know how to install MQTT library on Arduino, please refer this link
How to Install MQTT library on Arduino

If you are interested to setup your own MQTT Broker, please refer this link
How to setup free MQTT Broker

You can get sample code from our Github repository

Using this code you can control relay module from any where through internet
This can only be used for non commercial propose. We are using free MQTT server from Beebotte
Once the code is uploaded, you can use our test client page MQTT Smart Switch to switch relay
If you have changed the Topic Name in the code, then use that name here
You can also control the relay and change settings by connecting to Hotspot [192.168.4.1]