Voting resources, early voting, and poll worker information - VOTE. ... Adafruit is open and shipping.
0

Flickering Neopixel colors w/ Trinket
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Re: Flickering Neopixel colors w/ Trinket

by GDSever on Fri Aug 21, 2020 5:30 pm

Bill, I really do appreciate the help you've provided to try to diagnose this issue. The ceramic capacitor, unfortunately, did not help. The Neopixels from 2017-08-25 still flicker.

For the sake of my own sanity, I soldered up those last 4 of the "old" Neopixels from 2016/2017. When I plugged them into the exact same breadboard setup as I used for all our previous tests... and the older Neopixels worked perfectly without any flicker whatsoever. Below is a video of that. As you can see, in 45 seconds there was no flickering whatsoever.

https://youtu.be/AOp4QdZCLZU

This leads me to the conclusion that the 50 or so Neopixels I bought last year (2019) that were marked 2017-08-25 on the bag are defective or have some other manufacturing / component change that makes them behave differently, and I therefore cannot use them. I am trying to stay optimistic that the batch of Neopixels I ordered a couple days ago will work as desired when they arrive - I will let you know. Is there any way to see what changed in the mini PCB design or component sourcing between the 2016 and 2019 timeframe that might have caused this? I'd also happily mail the remaining 2017-08-25 ones back with the strings soldered to you if you want to confirm on your end.

I have included additional pictures of the breadboard with the "older" 2016/2017 Neopixels plugged in so you can see I haven't changed anything.

This last test with the old 2016 neopixels at least reaffirms that I'm not crazy. The original ones I bought didn't have this issue.
Attachments
Old 2016 Neopixel front side.jpg
close up shot showing the screen printing for these older neopixels
Old 2016 Neopixel front side.jpg (259.79 KiB) Viewed 24 times
Old 2016 neopixels w Breadboard.jpg
Overall shot demonstrating I'm using the same breadboard setup & power supply as the other tests
Old 2016 neopixels w Breadboard.jpg (353.5 KiB) Viewed 24 times
GDSever
 
Posts: 11
Joined: Thu Dec 16, 2010 10:48 am

Re: Flickering Neopixel colors w/ Trinket

by adafruit_support_bill on Sat Aug 22, 2020 9:25 am

The design of the circuit & PCB has not changed. There have been some changes in our supply of chips. The older WS2812B chips have been largely superseded by the SK6812 chips which are pin-compatible, but tend to be more robust than the WS2812Bs.

adafruit_support_bill
 
Posts: 78956
Joined: Sat Feb 07, 2009 10:11 am

Re: Flickering Neopixel colors w/ Trinket

by GDSever2 on Sat Aug 22, 2020 5:26 pm

The 30/meter strip and breadboard Neopixels arrived today (Order #2349086-7270086988). I cut & soldered 9 of the strip pixels and they work fine - no flickering. I haven't tried the breadboard ones yet, I may do that tomorrow just to make sure they behave as desired.

Whatever is up with these 50 Mini PCB pixels I bought last year (The ones labeled 2017-08-25), I am done wasting my time with them. I hate to throw $44 in the garbage (was on order #2021997-0830876734), but every one I've tried has the flickering issue and my time is worth more to me than that. I am assuming there is no way to return them or get a refund, so I'll chalk it up to buyer beware.

Thank you for at least trying to help. Regards, Garrett.

GDSever2
 
Posts: 1
Joined: Sat Aug 22, 2020 5:18 pm

Re: Flickering Neopixel colors w/ Trinket

by adafruit_support_bill on Sun Aug 23, 2020 5:45 am

It is quite a bit past the 30-day warranty. But if you contact support@adafruit.com with a link to this thread we can offer a discount on replacements.

adafruit_support_bill
 
Posts: 78956
Joined: Sat Feb 07, 2009 10:11 am

Please be positive and constructive with your questions and comments.