How to get Physical state of AC loads?

Need Help With My Project
1

Hello everyone,
I am working on Home automation project.
I need to get Physical state of AC loads such as fans,bulbs etc.
I need both switching manually (from buttons)and from microcontroller.(Nodemcu with relay).
With Physical state indication using LED Widget.
My question is

How to get physical state(ON/OFF)??
Does it required rectifier circuit to convert AC to DC to get physical state of AC load to microcontroller??
Or any other Device is available ??

2

Maybe the following thread will give you some ideas:

3

There are many good ideas.
But i need some simple one.
I have more than 5 outputs
Such as T.V,Computer,Desklamp,2fans,1tube light.

4

@saurabh47 you can use the example provided by Blynk
https://github.com/blynkkk/blynk-library/blob/master/examples/More/SyncPhysicalButton/SyncPhysicalButton.ino
it works fine for me :slight_smile:

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5

I had uploaded this code.my code is ready.
Please read topic carefully.
I need physical state AC Devices(such as T.V,Fan which runs on alternating current.)
I need two switching one from microcontroller &from buttons.

6

I am thinking about applying such logic for two switching


Any idea to get physical state

7

One of my friend given me a best solution that is to
Use DPDT switch.
This switches are really cheap.
This is simplest solution…:smiley:

8

You can just use a normal relay and a two way switching to do the same thing in the video. But if you want to show the physical state in the app you are going to need a sensor to check that (voltage regulator, step-down transformer, current sensor, etc).

Untitled.png1027Ă—460 3.98 KB

This way you use the Blynk App to control the Relay and can also use the physical button. With a sensor close to your load you can see if it’s On/Off. The only problem is that depending on the position of your physical button the relay will have to stay activated to keep the load off, consuming some power.

1 Like