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I am using Arduino Uno. I want to control my room lamp both manually and over the network, so when I switch off my lamp manually, how do I get acknowledgement over the network that lamp is off ?

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Disconnect the switch from the lamp and instead connect it to a digital pin on the Arduino. Have the Arduino toggle the lamp when the switch changes position. – Gerben Aug 20 at 20:03
    
Or attach a lightsensor to see if the bulb is on. – Gerben Aug 20 at 20:04
    
@Gerben not nice. – PhillyNJ Aug 20 at 21:09
    
Please read How do I ask a good question?. What do you mean by "manually"? What do you mean by "acknowledgement over the network"? I don't know why the above comments have been reported to the moderators. – Nick Gammon♦ Aug 21 at 9:09
1  
@Gerben - My mistake.- I read it wrong. Sorry – PhillyNJ 2 days ago
up vote 0 down vote

There are a number of possibilities you could employ to confirm whether the lamp is switched on.

As mentioned in the comments, a practical method is for you to also include a light sensor (or photocell), the set up is shown in the Arduino Basics blog article Arduino UNO: PhotoCell - sensing light.

A major benefit of this setup is to also check that the lamp globe still works when switched on.

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