Problem in LCD 16x4 due to NOISE

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Venkadesh_M said:
post your result for each case i have given in #9..
Click to expand...

embpic said:
sorry sir when i run it without tube then works fine and after connecting tube it works randomely

- - - Updated - - -

without connecting relay - works fine
connecting relay and conecting tube - go randomely
only relay - remain to test
Click to expand...


LoL !!! i think we need to close this thread now Venkadesh_M. I don't think there's any resolution gonna happen here.

cheers!
 

Hai,

* Is this problem affecting your LCD's Only??? or it is effecing the whole controller section?

* What is the rating of the power source you are using in your design?

* Is the ULN's Freewheeling diodes are porperly connected to the Supply
 

Hi,

You could try switching just one relay/tube on at a time with a 15 second delay before the next tube.
Tried suppressors as mentioned earlier ?

8 relays coming on together with 8 chokes and 8 tubes creates a massive load on the supply and possibly your ULN2803/psu, depending on the current each relay takes ?
 

sreepss said:
Hai,

* Is this problem affecting your LCD's Only??? or it is effecing the whole controller section?

* What is the rating of the power source you are using in your design?

* Is the ULN's Freewheeling diodes are porperly connected to the Supply
Click to expand...


Forget it guys, this is a dead end thread. Or rather, it's a looping thread. Goes round n round n round.... LoL !!
 

kripacharya said:
Forget it guys, this is a dead end thread. Or rather, it's a looping thread. Goes round n round n round.... LoL !!
Click to expand...

Hi,

I have run several chokes and tubes via relays from a micro for years, so it is perfectly possible to do.

However we can only help based on the info he gives us, which so far has only been in general terms.

Given more details of the project / circuit / construction etc it might be a simple answer...
 


exactly my point. It SHOULD be a simple bug/ answer, but the OP doesn't have the wherewithall to provide cogent informations for a meaningful analysis.
Hence a waste of effort on our part.

anyhow.. i'm out.
cheers!
 

sorry for the delay of replying and providing lack of information. i am apologize for that.
and actually i am solving problem of my frnd's project. i have collected circuit diagram from him.
and i am also damn involve in this project to solve prolem
 

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embpic said:
yes sir power supply is same to operate relay but is dual not isolated.
how i could give proper isolation?
.
Click to expand...

So finally we have a circuit, but my original points still unanswered :

1) Why do you have this long chain of Opto AND relays ?
2) If you go and connect everything at the power supply, then your isolation is ruined anyhow. It doesn't matter how many opto's or relays or whatever you put in the signal path. And theres Still no definitive details on the power supply arrangement?!?
 

sorry sir not getting what you meant to say.
if i think i am getting what you want say, then
1) then i have connect each opto for each relay and i am opearting each relay separately.
2) i have connect 24 volts for this relay circuit and operating controller on 5volts.
 

yes sir i have connect ground and earthing.
and tried both seprately and by connecting together also.
sir, i have connect RC network of 10 ohm resister and 0.1/K/1000 of C.
and added after suppressor also which is RDN 275/14.
but still not getting any positive result.


i have tried three of condition given in #9 by Venkadesh_M
and result are

only controller without relay circuit -works fine
controller with relay circuit without tube -works fine
controller with relay circuit and tubes -works Bad

 

There are only two solutions for your problem.
1) don't use tubelights
2) don't work on these projects with your 'friend'
 

i think this is not solution and there should be way which is you don't know and even i also don't know.
 

embpic said:
i think this is not solution and there should be way which is you don't know and even i also don't know.
Click to expand...

Oh all of us here know how to fix it. It's the communication & information provided which are of insufficient quality.

Have you provided any details of your power supplies, and how they are interconnected ?
No.

Have you given us a pic of your actual physical setup ?
No.

Have you done proper decoupling everywhere ?
I doubt it.

...and so on
 

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