Control I2C Relay board from ESP8266 as well as through AC power supply

Hi, I am looking for circuit suggestion use with ESP8266 board which is further connected with I2C relay board. I want to create the two way switch which will work through arduino as well as through normal electric switch, I am little confused about circuit to be used as I want to create to use the power switcing manually as well as through my ESP8266 also. Any suggestion on this will be a great help.

Hi Bart-Suggestion:  Let the ESP8266 control the relay board, and then feed a signal from the electric switch to one of the inputs of the ESP8266.  This way all of the control signals flow through the ESP8266.  IMPORTANT: If you will be using a switch that is connected to  household current (120 to 220 volts), you MUST isolate the signal before it gets to the ESP8266 using a relay or optocoupler.By the way, you can find a much less expensive I2C relay board HERE.  Seeedstudio also carries them.-Rick

@rick: "...By the way, you can find a much less expensive I2C relay board HERE.   Seeedstudio also carries them...."Great feedback -- the I2C relay board you suggest is a much better value than the one Bart is using.

Hi all,Was following this thread and thought this might help for detecting the mains switch safely.eBay onto switch module. It looks to have the low and high voltage traces well separated.