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Dotstar has developed erratic behavior
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Dotstar has developed erratic behavior

by mroland on Mon Apr 15, 2019 1:14 am

I bought and have been working with my Dotstar LED strip (https://www.adafruit.com/product/2239?length=1) for a few weeks with no problems.

I was re-arranging my project build today and the strip has now developed erratic behavior. Mostly the LEDs are not working at all. If I tap the input wires and/or the strip around the first couple of LEDs the strip will light, but it will not animate as scripted. Sometimes only the first few LEDs will light.

I've soldered on new wires to the strip, but the strip has the same behavior.

I've verified 5V on the strip so that leads me to believe there's a problem with the signal (clock or data) on the strip. Any suggestions on how to troubleshoot this?

mroland
 
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Joined: Sun Feb 25, 2018 5:20 pm

Re: Dotstar has developed erratic behavior

by adafruit_support_mike on Mon Apr 15, 2019 3:10 am

Post a photo showing your hardware and connections and we'll take a look. 800x600 images usually work best.

adafruit_support_mike
 
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Re: Dotstar has developed erratic behavior

by mroland on Tue Apr 16, 2019 2:42 pm

Thanks for the reply. I'm attaching 2 photos:

Before: This is a screen cap of a video of a spectrum animation. This actually rotates around the circle. I was very happy about it!
Screen Shot 2019-04-16 at 11.38.31 AM.png
Screen Shot 2019-04-16 at 11.38.31 AM.png (618.32 KiB) Viewed 23 times


After: I worked on moving some components and was generally very gentle (no hard bends), but afterward the strip has communication problems.
IMG_3946.JPG
IMG_3946.JPG (419.35 KiB) Viewed 23 times

mroland
 
Posts: 3
Joined: Sun Feb 25, 2018 5:20 pm

Re: Dotstar has developed erratic behavior

by adafruit_support_mike on Tue Apr 16, 2019 11:55 pm

Thank you. From your description, it does sound like a connection issue.

Try using a fine-point probe like a bamboo skewer to tap individual wires and joints. Do the problems (or correct behavior) tend to occur when you make contact with a specific location?

adafruit_support_mike
 
Posts: 56406
Joined: Thu Feb 11, 2010 2:51 pm

Please be positive and constructive with your questions and comments.