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Troubleshooting AllPixel
#1
Hey guys,

Received my KS package a couple of days ago, hooray!

I went and soldered on all of the components, and hooked up the LED strip (WS2812/5m, came with my KS order), ran the demo python code from the Quick start guide and... nothing.

I left it alone and returned to it tonight. I've checked all my soldered joints with a multimeter and am happy with the connections. I'm running Mac OSX, Python 2.7.6, and freshly installed pip, pyserial, BiblioPixel.

As far as the software is concerned, all is working. The LED on the AllPixel board is lit up green, there's 5v going through the LED strip, but no data.

Is there anything specific to Mac that I'm not doing? And/or is there any process you can guide me through to help troubleshoot if it's the software/AllPixel or LED strip?

Thanks!


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#2
@vorno - Looks like there's nothing wrong software wise. It's clearly able to communicate with the AllPixel no problem.
So let's look at your connections.
First, did you install the resistors at R6 and R7 or at least solder the jumper pads?
Check to make sure the data wire on the LEDs is connected to the LED pin on the AllPixel, not clock.

Could you take a couple pictures of your board with the components on it and the hookup to your LEDs? That would be greatly helpful.
#3
Thanks Adam for your reply.

Yep I've install all the components on the board, including the two resisters. And yes am wired correctly to the data pin, not clock pin.

Here's a couple pictures:
http://i.imgur.com/wFm8D1E.png
http://i.imgur.com/Bylu2JS.png
http://i.imgur.com/pg3WV4a.png

I'm wondering if the data pin is being shorted? Is there a way I can test the signal from the data pin with my multimeter?

Otherwise I'm not sure. Any suggestions on points to test/check for conductivity or shorted much appreciated.
Thanks!
#4
Does your multimeter have a continuity mode? (Here's a good primer on that feature: http://www.ladyada.net/library/metertut/continuity.html) I would start with checking any pins that are near the data and R6 pins and make sure there's no continuity (shorting) between pins that shouldn't be.

Use that to also test that there is continuity between the left side of R6 (near C4) and the data pin on the screw terminal (just touch the top of the screw). If your meter doesn't beep (or whatever it does) when you make that connection, then there's a break somewhere.

I would also clean up that large solder blob on the USB side of the R6 pin. There's a ton there and it's over another trace on the board... I really doubt it burned through the solder mask and made contact with that trace, but it's best to be sure. Just heat up that solder again and wipe it away... or use de-soldering braid.

Otherwise your assembly looks good. Just check the continuity to make sure everything that is supposed to be connected is and vice versa.

Let me know if you have any questions.
#5
Hey Adam,

Testing continuity across the pins did not highlight any problems.

As suggested I resoldered (and cleaned up) the R6 points. Success! Test code now working correctly.

Thanks so much for your assistance. Now to dream up fun projects with it.
#6
(04-24-2015, 11:49 PM)vorno Wrote: Hey Adam,

Testing continuity across the pins did not highlight any problems.

As suggested I resoldered (and cleaned up) the R6 points. Success! Test code now working correctly.

Thanks so much for your assistance. Now to dream up fun projects with it.

Awesome! Smile Glad my hunch was right.
Definitely feel free to post about any of what you dream up here on the forums! We love seeing user projects Smile 


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