Old 05-11-2011, 01:12 PM #1
Plan B's Avatar
Class 1M Laser
 
Join Date: Jan 2011
Location: Stettler, AB. Canada.
Posts: 131
Rep Power: 10
Plan B is a jewel in the roughPlan B is a jewel in the roughPlan B is a jewel in the rough
Plan B Plan B is offline
Class 1M Laser
Plan B's Avatar
 
Join Date: Jan 2011
Location: Stettler, AB. Canada.
Posts: 131
Rep Power: 10
Plan B is a jewel in the roughPlan B is a jewel in the roughPlan B is a jewel in the rough
Default Help with rgb led wiring

Hi all,

I need a hand with simple lighting toy I'm trying to build. It seems it should be a simple problem, but I can't seem to wrap my head around how to wire it up. I need to pack 9 rgb LEDs as close as I can to each other in a 3x3 pattern. These are 4 lead, common cathode LEDs and it makes for tight wiring so I would like to keep it simple and use as few connections and resistors as possible.

My original plan was to take 3 LEDs in a row and solder their common leads together, red to red, cathode to cathode and then solder on 1 resistor for each channel. (This would give me 3 LEDs running in parallel?) After building 2 more of the above, I was planning to solder together all the common channel leads and cathodes and wire them to there respective switches and battery. (This gives me 9 LEDs running in parallel?) Here's what the circuit looks like.



I set it up on a breadboard and started messing with the red. I used a 9v battery and three 180ohm, 1/4W resistors, 1 for each bank of 3 LEDs. The red on these LEDs has a fv of 1.8v and run at 20mA. This set up didn't work and only the first bank of 3 LEDs lit up. This makes no sense to me since the other banks were connected to the same switch and negative line as the first bank. Why would the first bank work but not the second and third? Another thing was the resistor on the working bank got very hot, very fast so I think I'll have to replace it with two 360ohm resistors in parallel as 1/4w's are all I have.

Anyways, if someone could help me figure out what's wrong with my circuit or suggest a better set up I would really appreciate it.

Cheers,
Plan



Last edited by Plan B; 05-12-2011 at 05:50 AM. Reason: trying to get pic to work
Plan B is offline   Reply With Quote


















Old 05-11-2011, 09:16 PM #2
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,293
Rep Power: 211757
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,293
Rep Power: 211757
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: Help with rgb led wiring

Sounds like a short somewhere. Triple check your wiring and be sure none of those leads are touching things they shouldn't be.

Could you post a schematic or take a pic?
__________________
A problem well stated is a problem half solved.

Last edited by Cyparagon; 05-11-2011 at 09:17 PM.
Cyparagon is online now   Reply With Quote
Old 05-11-2011, 10:52 PM #3
Plan B's Avatar
Class 1M Laser
 
Join Date: Jan 2011
Location: Stettler, AB. Canada.
Posts: 131
Rep Power: 10
Plan B is a jewel in the roughPlan B is a jewel in the roughPlan B is a jewel in the rough
Plan B Plan B is offline
Class 1M Laser
Plan B's Avatar
 
Join Date: Jan 2011
Location: Stettler, AB. Canada.
Posts: 131
Rep Power: 10
Plan B is a jewel in the roughPlan B is a jewel in the roughPlan B is a jewel in the rough
Default Re: Help with rgb led wiring

That's weird! I had a schematic in my original post but when I came back to read your post it was gone. I logged in to reply and now I see it in the first post again. I have it hosted in my album here at LPF and haven't had this issue when posting pictures before. Here it is again, hope it works.

http://laserpointerforums.com/member...r/5287-orb.jpg



I had a very thorough search for any shorts or other issues and didn't find anything, but I will give it another look. Thanks for the reply Cy.

Last edited by Plan B; 05-12-2011 at 05:49 AM. Reason: trying to get pic to work
Plan B is offline   Reply With Quote
Old 05-12-2011, 01:43 AM #4
Flaminpyro's Avatar
Class 4 Laser
 
Join Date: May 2009
Location: West central Oregon
Posts: 5,462
Rep Power: 26216
Flaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond repute
Flaminpyro Flaminpyro is offline
Class 4 Laser
Flaminpyro's Avatar
 
Join Date: May 2009
Location: West central Oregon
Posts: 5,462
Rep Power: 26216
Flaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond reputeFlaminpyro has a reputation beyond repute
Default Re: Help with rgb led wiring

I tryed to look at your schematic but it wasn't there try reposting it...
__________________
White Fusion Time Machine 445
473nm LRS-0473-KFM-00150-10 158.5mW Lab style
laser used in the making of the latest TRON movie

CNI PGL-III-C-589 125mW
520 in a SH-032
Viasho 532nm 500mW
CNI pen 532nm 84mW
The Violet Pip Squeek 45mW

_____________________________________
LOOKING FOR A HOST WITH PERFECT HEAT SINKING
order your C-88 Cu kit today !

Flaminpyro is offline   Reply With Quote
Old 05-12-2011, 03:14 AM #5
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,293
Rep Power: 211757
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,293
Rep Power: 211757
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: Help with rgb led wiring

It's there, but the resolution is too small for me to make anything out. (1x1 pixel )

I tried looking at your albums directly, but "This user does not have any albums to display."

Try changing your privacy settings
__________________
A problem well stated is a problem half solved.

Last edited by Cyparagon; 05-12-2011 at 03:24 AM.
Cyparagon is online now   Reply With Quote
Old 05-12-2011, 05:56 AM #6
Plan B's Avatar
Class 1M Laser
 
Join Date: Jan 2011
Location: Stettler, AB. Canada.
Posts: 131
Rep Power: 10
Plan B is a jewel in the roughPlan B is a jewel in the roughPlan B is a jewel in the rough
Plan B Plan B is offline
Class 1M Laser
Plan B's Avatar
 
Join Date: Jan 2011
Location: Stettler, AB. Canada.
Posts: 131
Rep Power: 10
Plan B is a jewel in the roughPlan B is a jewel in the roughPlan B is a jewel in the rough
Default Re: Help with rgb led wiring

Checked my privacy settings and all were set to "everyone". I then noticed that the album was set to private so I made it public. I can still only see the pic when I'm logged in though so I'm not sure if it worked. Can you guys see the schematic now in the posts above? In case you still can't I hosted it at another location also. Hopefully one of these will work now. Thanks again for all your help fellas.

http://i231.photobucket.com/albums/e...lights/ORB.jpg



I set it up on a breadboard and started messing with the red. I used a 9v battery and three 180ohm, 1/4W resistors, 1 for each bank of 3 LEDs. The red on these LEDs has a fv of 1.8v and run at 20mA. This set up didn't work and only the first bank of 3 LEDs lit up.

Last edited by Plan B; 05-12-2011 at 05:59 AM.
Plan B is offline   Reply With Quote
Old 05-12-2011, 08:09 PM #7
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,293
Rep Power: 211757
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,293
Rep Power: 211757
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: Help with rgb led wiring

Yeah, it's showing up now.

Each red should be running at 13mA according to the schematic. Its either a loose connection, user-error, or some of the components are dead. Check the voltages across each of the LEDs.
__________________
A problem well stated is a problem half solved.
Cyparagon is online now   Reply With Quote
Old 05-14-2011, 03:45 AM #8
Plan B's Avatar
Class 1M Laser
 
Join Date: Jan 2011
Location: Stettler, AB. Canada.
Posts: 131
Rep Power: 10
Plan B is a jewel in the roughPlan B is a jewel in the roughPlan B is a jewel in the rough
Plan B Plan B is offline
Class 1M Laser
Plan B's Avatar
 
Join Date: Jan 2011
Location: Stettler, AB. Canada.
Posts: 131
Rep Power: 10
Plan B is a jewel in the roughPlan B is a jewel in the roughPlan B is a jewel in the rough
Default Re: Help with rgb led wiring

After a second going over I found my problem. I originally thought my circuit design was the issue, but it turns out a failure in my bread board caused the problem. One of the metal strips on the bottom had broken between two contacts I was using. Thanks again for your help Cy.
Plan B is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

























Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 01:28 PM.


Powered by: vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC