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Yes it can be used in that way, In my house also I am using it in that way only, all the four devices have mechanical switches for normal operation too side by side, you can operate with wall switch as well as through smartphone.
Thanks, please provide improvement areas if you find any.
Yes you can modify it in endless ways, next I am planning to use it to give my pump controller a touch of IOT with this.
Low Cost 4 channel Wifi swi...View Instructable »