Neopixel rings, which is LED #1?

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larry_athey
 
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Neopixel rings, which is LED #1?

Post by larry_athey »

I know, stupid question...I have a 5V Trinket that I intend to use for the color organ project with a 16 pixel inside of a 24 pixel Neopixel ring. I've looked at the diagrams on this page https://learn.adafruit.com/adafruit-neo ... /downloads

I don't see anything on the diagrams or the PCBs themselves that indicate which LED in the ring is the first one. The idea is to start at the first LED on the 16 pixel ring and then overflow to the 24 pixel ring.

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bidrohini
 
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Re: Neopixel rings, which is LED #1?

Post by bidrohini »

I think we have to figure out in real life by coding.

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westfw
 
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Re: Neopixel rings, which is LED #1?

Post by westfw »

It looks like, if you hold up the ring with the top facing you and the IN and OUT connections at the top, LED #0 (not 1!) is the one immediately to the left of the rightmost connection. (but that's "IN" on 16 ring, and "OUT" on the 24 ring!)
16-ring:
16ring.png
16ring.png (45.94 KiB) Viewed 95 times
24-ring:
24ring.png
24ring.png (28.26 KiB) Viewed 95 times

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adafruit_support_carter
 
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Re: Neopixel rings, which is LED #1?

Post by adafruit_support_carter »

I think we have to figure out in real life by coding.
This is easy enough to do that it's probably the best general approach. That way there won't be any confusion about location on the actual PCB. Just write a simple code that only lights up LED 1.

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