I have a home automation project. It is perfectly running. To add more to it, I would like to detect the status of light or any other electrical appliance. For instance, I turn the light on from my phone, it toggles the ac light and displays the status according to the state of the relay. But when I turn the light off from the switch on the wall, the status of light on the phone is left unchanged.
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Provide a sensing element like relay or Optocoupler in series with the bulb or ldr and use its output to display status on your phone. Just giving idea. Not bidding Relevant Skills and Experience Electronics hobbyist