{"id":3562,"date":"2014-03-12T18:49:02","date_gmt":"2014-03-13T02:49:02","guid":{"rendered":"http:\/\/www.corbinstreehouse.com\/blog\/2014\/03\/led-cyr-wheel-ws2811-ws2812-strip-first-pixel-dyingburning-out\/"},"modified":"2018-11-03T13:36:24","modified_gmt":"2018-11-03T20:36:24","slug":"led-cyr-wheel-ws2811-ws2812-strip-first-pixel-dyingburning-out","status":"publish","type":"post","link":"https:\/\/www.corbinstreehouse.com\/blog\/2014\/03\/led-cyr-wheel-ws2811-ws2812-strip-first-pixel-dyingburning-out\/","title":{"rendered":"LED Cyr wheel: WS2811 \/ WS2812 strip first pixel dying\/burning out"},"content":{"rendered":"

\n

I’m having trouble with the WS2811 \/ WS2812 strip and the first pixel dying or burning out. First off, I thought I ordered the WS2812B strips, which are supposed to be reverse voltage safe. However, I failed to take a close look at the strip I got, and it wasn’t what was in the picture from AliExpress. I have the WS2812 chips. It is too late to try to return it to China, as I took a month off to go on vacation before I came back to the project.<\/p>\n

Still, apparently people have the same problem with the WS2812B chips, so there is still an issue. The WS2812B also needs a 5v signal, whereas a 3.3v signal from the Teensy 3.1 works for the older WS2812 chip.<\/p>\n

Notes on issues; NeoPixel is AdaFruit’s version of WS2812, and may or may not mean the B chip<\/p>\n

AdaFruit “Best Practices<\/a>“: – Note I did this, using a ~300 Ohm resistor and 100uF cap (may have been too small), and still had one fail. So, research:<\/p>\n

AdaFruit: NeoPixel Strip 60 LED burned first pixel problem \u2022 adafruit industries \u2022<\/a> – WS2811B chip
\nAdaFruit: Neopixel Strip Pixels dying (?) \u2022 adafruit industries \u2022<\/a><\/p>\n

Via OctoWS2811<\/a> there are these details on the signal wire WS281X signal quality(wire length, resistors, and grounds. Oh my!)<\/a> — which tells me I now need a scope to figure out what resistor I actually need to smooth out the signal (so, I just ordered one).<\/p>\n

On https:\/\/solarbotics.com\/download.php?file=2159<\/a> I discovered this tidbit:<\/p>\n

\n\"Screen<\/p>\n

So, I’m going to give the 1N4148 diode a try. I just picked some up from Radio shack\u2026seems to not affect things, so hopefully I won’t get anymore dead. I tried with and without the “protection” to kill LEDs by shorting and powering wrong bits, but nothing kills them on demand.<\/p>\n

If they fail..then I have to kick down some more $ for:<\/p>\n

http:\/\/www.aliexpress.com\/store\/product\/4m-DC5V-WS2812B-led-pixel-srip-non-waterproof-60pcs-WS2812B-M-with-60pixels-white-PCB-only\/701799_935613197.html<\/p>\n

I heard Ray Wu is a good seller to buy from. At $190, only a little more expensive than the last set i bought\u2026<\/p>\n

UPDATE<\/b>: Taking a look at the LEDs I bought from AliExpress I see what looks like a 1N4148 diode and resistor every ~20 pixels or so. Whereas the other strips I bought from Sparkfun don’t have such protection. I’ve been using the Sparkfun strips for testing..maybe that is why they are burning out?<\/p>\n","protected":false},"excerpt":{"rendered":"

I’m having trouble with the WS2811 \/ WS2812 strip and the first pixel dying or burning out. First off, I thought I ordered the WS2812B strips, which are supposed to be reverse voltage safe. However,… [read more]<\/a><\/p>\n","protected":false},"author":1,"featured_media":3561,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[13],"tags":[],"class_list":["post-3562","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-circus-and-silk"],"jetpack_featured_media_url":"https:\/\/www.corbinstreehouse.com\/blog\/wp-content\/uploads\/2014\/03\/Screen-Shot-2014-03-12-at-6.41.55-PM.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/posts\/3562","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/comments?post=3562"}],"version-history":[{"count":3,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/posts\/3562\/revisions"}],"predecessor-version":[{"id":5390,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/posts\/3562\/revisions\/5390"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/media\/3561"}],"wp:attachment":[{"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/media?parent=3562"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/categories?post=3562"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/tags?post=3562"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}