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Defective Dotstar strip?
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Defective Dotstar strip?

by GMTurner on Fri Jul 26, 2019 4:37 pm

I have a newly purchased Dotstar strip, and am concerned that it may be defective.
LEDs 2, 9 and 10 are lit solid blue as soon as power is applied, and I can't seem to control them with any commands from the Raspberry Pi (Model 3 B+) that I am using.

I've started by powering the strip with a 2A adapter from Adafruit (model GEO151UB-5025) that I realized may be underpowered for all 60 LEDs, but was hoping could work to power a few of them at least. I see the same behavior when I power it from the 5V pin on the Raspberry Pi.

Here is the behavior:
dotstar1.jpg
dotstar1.jpg (86.1 KiB) Viewed 124 times


and here is the wiring:
dotstar2.jpg
dotstar2.jpg (107.96 KiB) Viewed 124 times


When I run the dotstar_simpletest.py program the first LED will blink a faint red periodically suggesting that there is some signal being received from the periodic changing in the loop in the script. I'm wondering if the strip is perhaps defective? It is quite warm to the touch between the lights that are lit. I've tried pressing on them and near them but nothing changes.

Any help you can provide would be very appreciated.

GMTurner
 
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Re: Defective Dotstar strip?

by adafruit_support_mike on Sat Jul 27, 2019 2:22 am

Double-check the strip to see which way the arrows under the pixels are pointing. They indicate the direction the data signals travel.

Some strips have wiring connected to the output end, so the connections that look obvious don't work.

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Re: Defective Dotstar strip?

by GMTurner on Mon Aug 05, 2019 9:58 am

Hi Mike. Thank you for the suggestion. I checked and confirmed that the direction of the signal is in the direction of the arrows. Does this sound like a defective strip to you?

GMTurner
 
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Re: Defective Dotstar strip?

by adafruit_support_mike on Mon Aug 05, 2019 12:14 pm

It could be. Can you control any other LEDs in the strip?

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Re: Defective Dotstar strip?

by GMTurner on Mon Aug 05, 2019 5:16 pm

No. I can’t get any commands to register and change any of the leds on the strip.

GMTurner
 
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Re: Defective Dotstar strip?

by adafruit_support_mike on Tue Aug 06, 2019 9:07 pm

It sounds like at least the first pixel in the strip is dead.

Just to check, when did you get the strip?

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Re: Defective Dotstar strip?

by GMTurner on Wed Aug 07, 2019 9:11 am

The strip was ordered on April 27, but didn't get the harness pieces for the plugs and power supply until July 11, which is the first date I plugged it in.

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Re: Defective Dotstar strip?

by adafruit_support_mike on Fri Aug 09, 2019 11:12 pm

I'm afraid that puts your first post past our 30-day return/replace period.

If the first pixel is dead, you should be able to clip it off and connect the data input to the next pixel in the strip. See if that works.

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Please be positive and constructive with your questions and comments.