Are you sure the polarity of the wires from the video doorbell connected to the breadboard are correct?

 

Are you sure the polarity of the wires from the video doorbell connected to the breadboard are correct?

Yes. I checked it again.

 

OK it appears the Red wire is negative. Remove Q2 from the breadboard and connect the video doorbell back up and see what happens.

 

Yes, red wire is the negative.

Once the Q2 is removed, I was able to connect the both wires from the video doorbell with the breadboard without activating the doorbell. But none of the buttons activated the other system.

 

With Q2 removed what happens when you press the video button?

 

With Q2 removed what happens when you press the video button?

Then the video doorbell rang. But the 230v bulb didn’t light up.

 

It was working yesterday meaning the relay module did activate, correct?

 

It was working yesterday meaning the relay module did activate, correct?

Yes. But as I hadn’t connected the 230v side correctly, I was testing it by powering the 230v opto-isolater continuously with AC current. if it was not powered with AC current, video doorbell was activated without pressing its button.

Later I realised, in the real scenario opto-isolator would only be activated by pressing the wall switch.

 

That doesn't seem right it should have been just the opposite. May have a bad transistor.
Remove Q2 and leave Q1 installed. Measure the voltage on the output of the video button, should have appx 3 volts.
The voltage at the red arrow junction should be appx 0 volts.

 

That doesn't seem right it should have been just the opposite. May have a bad transistor.
Remove Q2 and leave Q1 installed. Measure the voltage on the output of the video button, should have appx 3 volts.
The voltage at the red arrow junction should be appx 0 volts.
View attachment 298834

The voltage between the video doorbell button wires is still 3.06v and the voltage at the red arrow in reference to the negative wire of the 5v supply is almost 0.0v. The voltage at the same point in relation to the negative wire of the video doorbell is also 0v. (Images are attached).

 

OK. Now when you press the video button does the relay activate?

 

OK. Now when you press the video button does the relay activate?

Unfortunately it’s not.

 

Appears Q1 is shorted. If so then removing Q1 should activate the relay module immediately.

 

Appears Q1 is shorted. If so then removing Q1 should activate the relay module.

I removed the Q1. But that didn’t activate the relay.

 

With Q1 removed what does the voltage read at the RED arrow junction? Should be appx 5 volts.

 

With Q1 removed what does the voltage read at the RED arrow junction? Should be appx 5 volts.

Yes correct. 5v.

 

Then the diode is bad or installed backwards if the relay module does not activate.

 

Then the diode is bad or installed backwards if the relay module does not avtivate.

Once I changed the direction of the diode, relay got activated and then deactivated in a around 2 seconds. But then I saw there is a 5v at the red arrow. And at that time, pressing the video doorbell button did not activate the relay. All these was done removing Q1 and Q2.

When only the Q1 is in place with reversed diode, relay keeps activated all the time.

 

Why did the relay module deactivate after two seconds, did you remove the diode after it first activated?

 

Why did the relay module deactivate after two seconds, did you remove the diode after it first activated?

Not at all. Without doing anything the relay went off in couple of seconds. The Reversed diode was in place.