https://www.digikey.com/en/blog/pul...width modulation turns a,to when it turns off.

Still no idea how to control external circuit in case PWM is used, any hints? thanks

 

to fix that behavior, means that there suppose to be 0V on both meter readings.

No, that is just your misunderstanding of how the PWM module works.

Do you have an Ohmmeter? If so, disconnect the PWM module from everything and measure the resistance between the + input and output and the - input and output. Hopefully this will tell you which of the two is switched.

 

@BobTPH the author of that PWM switch told me they switch - pole.

 

@BobTPH the author of that PWM switch told me they switch - pole.

Good, as I suggested.

Now look at your diagram, and connect the + in to the plus out. And be aware the - in and -out are not connected.

Now can you see that your probes are simply measuring the battery voltage?

 

Good, as I suggested.

Now look at your diagram, and connect the + in to the plus out. And be aware the - in and -out are not connected.

Now can you see that your probes are simply measuring the battery voltage?

sorry i think we each are talking about something different, which is not making the final use-case working.
i just do not understand.
i had other meter connected to +out and -in/out disconnected but that wont solve my issue.

 

You seem to think I am addressing the problem of your relay. I have said nothing about that because you first have to know how the PWM module works.

The module switches the - line hundreds of times second. You cannot get what you want by just connecting the relay coil somewhere. You need some electronics that can switch the relay based in whether the PWM output is active or not.

 

Yes you are correct.

But - pole is switched xy times,
And I am taking as a signal to control rellay + pole after pwm switch.

So that's why I am confused in the whole thing and yes some electronic so that's why I opened thread so someone can easily advice.. For me it's hard to learn and study all the concepts behind...

It's like you have junior computer engineer and you force him to understand complex algorithm where knowledge of multiple prerequisites is required....

For me it's enough if someone says use that module connect it as that and thats it... Instead of addressing I have to understand ohm law... Pwm... Etc etc..

 

There is no simple solution like you want, so I guess we are done.

 

The complexity doest matter.
The question would be if it's possible to be done.

 

Yes, it is possible. I am not in the habit of designing and testing circuits for people. But I can give you the idea of how it might be done.

You need a monostable multivibrator circuit that is triggered by each PWM pulse and stays active for longer than the PWM period. An LM555 timer IC and do this and drive the relay directly.

 

I was thinking that some predesigned modules exists... But I might be wrong.

Currently as - pole is switching I still don't get it ..

Bc I am taking + pole from the led strip which is not switching ie there should be 0v between that and direct ground on psu? Also that's the reason why strip is off.

 

https://www.electroschematics.com/voltage-converter-module/

 

Bc I am taking + pole from the led strip which is not switching ie there should be 0v between that and direct ground on psu?

The + coming out of the PWM module is ALWAYS connected to the battery plus. So there is 12V between that and the ground of the PSU.

 

The + coming out of the PWM module is ALWAYS connected to the battery plus. So there is 12V between that and the ground of the PSU.

Makes sense. I dont get why the design is to switch - pole instead of the + one.

 

Makes sense. I dont get why the design is to switch - pole instead of the + one.

Because the circuit is simpler that way.

 

Okay someone wanted to make it more easy... As usual.

Was not aware that complexity depends on which pole is switched.

The link of the PWM to analog... Is that what I need I guess?

 

Okay
I believe that even there is live active and stripe is off there is no power consumption ie no load. So I think it's better to use Some device
That in case current (load) < 0.0xxA cut the live... Otherwise keep live on.

 

Okay someone wanted
The link of the PWM to analog... Is that what I need I guess?

No.

 

Okay
I believe that even there is live active and stripe is off there is no power consumption ie no load. So I think it's better to use Some device
That in case current (load) < 0.0xxA cut the live... Otherwise keep live on.

So maybe that's the way?

 

So maybe that's the way?

No.

Since you don’t like what I propose, I am done. Have fun.