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Fadecandy stopped working
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Please be positive and constructive with your questions and comments.

Fadecandy stopped working

by jcfischer on Thu Jan 03, 2019 4:21 pm

I bought a Fadecandy and an 8x8 Neopixel matrix and soldered them up according to the introductory article on learn.adafruit.com - everything worked perfectly.

I then removed the Matrix and want to attach single strips of 50 Neopixels [1]. I soldered the strip in (location 0 as the matrix before) but the LEDs don't light up. Things I checked

- Voltage on +5 / GND on strip: OK
- There's about a 700 Ohm resistance between the GND and data pads on the Fadecandy (not sure if that's normal)
- The fcserver sees the Fadecandy controller and "Identify" works (the LED on the Fadecandy blinks)
- Resoldered the Matrix (to port 7 this time) => Doesn't work either

What more can I test?

thanks
Jens-Christian

[1]: https://www.aliexpress.com/item/50pcs-P ... 4c4dgsQDQz

jcfischer
 
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Re: Fadecandy stopped working

by adafruit_support_carter on Thu Jan 03, 2019 8:45 pm

Post photos of your current setup showing the solder job on the pins.

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Re: Fadecandy stopped working

by jcfischer on Fri Jan 04, 2019 3:16 pm

Thanks, will do that. I have disassembled most of the things, but will try to get it back to its (non working) state tomorrow and make the pictures

cheers
jc

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Re: Fadecandy stopped working

by jcfischer on Fri Jan 04, 2019 5:28 pm

I just read the sticky post - and - sigh - I wired up the data output from the Fadecandy to the DOU port of the LED strip. Sorry for wasting bandwidth.

I'm still wondering why the 8x8 Matrix doesn't work anymore - I will try to rewire everything tomorrow and see if things fall into place.

/jc

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Re: Fadecandy stopped working

by jcfischer on Sat Jan 05, 2019 11:15 am

and that was indeed the problem. Wiring it the correct way made everything work. In sympathy, even the 8x8 Matrix started working again!

/jc

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Re: Fadecandy stopped working

by adafruit_support_carter on Mon Jan 07, 2019 2:17 pm

Awesome, glad you figured it out. Thanks for letting us know.

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Please be positive and constructive with your questions and comments.