Hello,
I try to use NeoPixel Rings (24 and 16 x 2) with trinket but it doesn't work.
When I receive it I've try the goggle projet with the 2 16 pixel rings and this work but not perfectly.
Two days later I've tried again and this time it doesn't work at all.
There is just one LED who work when I disconnect the ground from the ring.
I've see the signal from the trinket in a scope and there is some mistake on pin #0 & #1 it's not very squared. Maybe I do something wrong who damage pin #0 & #1 and the NeoPixel rings ?
Can you help me?
I'm sorry for my poor english =/
NeoPixel Rings problems
Moderators: adafruit_support_bill, adafruit
Please be positive and constructive with your questions and comments.
- adafruit_support_bill
- Posts: 88093
- Joined: Sat Feb 07, 2009 10:11 am
Re: NeoPixel Rings problems
What part did not work? If you post photos we can check your wiring.When I receive it I've try the goggle projet with the 2 16 pixel rings and this work but not perfectly.
Do not disconnect the ground from the ring while there is power still applied! This will damage the ring. The ground should always be the first wire connected. See this guide: http://learn.adafruit.com/adafruit-neop ... -practicesThere is just one LED who work when I disconnect the ground from the ring.
- Tsuguto
- Posts: 10
- Joined: Fri Jan 24, 2014 3:32 am
Re: NeoPixel Rings problems
Some pixels weren't bliking but it doesn't work anymore so I can't post photos.
I use this wiring without the batery because I use USB for prog.
Maybe I've done something wrong because I don't use cap & resistor like the photo. Is it very usefull?
Does the trinket is damage too?
I try to use 4 neopixels V2 with gemma and a 3.7V LiPo (2500mAh) and it work. Should I add cap & resistor? (and witch type?) I'm afraid to damage it too.
Thanks.
I use this wiring without the batery because I use USB for prog.
Maybe I've done something wrong because I don't use cap & resistor like the photo. Is it very usefull?
Does the trinket is damage too?
I try to use 4 neopixels V2 with gemma and a 3.7V LiPo (2500mAh) and it work. Should I add cap & resistor? (and witch type?) I'm afraid to damage it too.
Thanks.
- adafruit_support_bill
- Posts: 88093
- Joined: Sat Feb 07, 2009 10:11 am
Re: NeoPixel Rings problems
There is no power on the BATT pin when powered by USB, so that wiring will not work.I use this wiring without the batery because I use USB for prog
A capacitor should not be necessary with battery power. The resistor (~330 ohm) on the data line is good protection against damage due to noise on the data line).
- Tsuguto
- Posts: 10
- Joined: Fri Jan 24, 2014 3:32 am
Re: NeoPixel Rings problems
I made a mistake, I'm connected on the USB+...
But I'm sure that I have 5V on Bat+
What can I do with my rings if they weren't working at all?
But I'm sure that I have 5V on Bat+
What can I do with my rings if they weren't working at all?
- adafruit_support_bill
- Posts: 88093
- Joined: Sat Feb 07, 2009 10:11 am
Re: NeoPixel Rings problems
Damage typically affects the first pixel. You can try connecting the signal wire to the input pin of the second pixel in the ring. Often, the rest of the ring will light up.
- Tsuguto
- Posts: 10
- Joined: Fri Jan 24, 2014 3:32 am
Re: NeoPixel Rings problems
I've tried everything I can do ....
- adafruit_support_bill
- Posts: 88093
- Joined: Sat Feb 07, 2009 10:11 am
Re: NeoPixel Rings problems
If you contact [email protected] with a link to this thread we can send a replacement. Please follow the best practices in this guide to avoid problems in the future:
http://learn.adafruit.com/adafruit-neop ... -practices
http://learn.adafruit.com/adafruit-neop ... -practices
- Tsuguto
- Posts: 10
- Joined: Fri Jan 24, 2014 3:32 am
Re: NeoPixel Rings problems
Hello,
I have an other question, I use a 3V Trinket with a 3.7V LiPo like the picture that I've posted before.
You say that neopixel use a 5V logic command (http://learn.adafruit.com/adafruit-neop ... -practices) but the tutorial (http://learn.adafruit.com/kaleidoscope- ... nket-gemma) say that will work with the 3V.
What I have to do? - Trinket 3V + 3.7V Lipo (better)?
- Trinket 5V + 3.7V Lipo?
- Trinket 3V + 3.7V Lipo + logic level converter (worst for me)?
- Trinket 5V + 5V source (no idea ton make this source)?
Sorry for my poor english.
Thanks
I have an other question, I use a 3V Trinket with a 3.7V LiPo like the picture that I've posted before.
You say that neopixel use a 5V logic command (http://learn.adafruit.com/adafruit-neop ... -practices) but the tutorial (http://learn.adafruit.com/kaleidoscope- ... nket-gemma) say that will work with the 3V.
What I have to do? - Trinket 3V + 3.7V Lipo (better)?
- Trinket 5V + 3.7V Lipo?
- Trinket 3V + 3.7V Lipo + logic level converter (worst for me)?
- Trinket 5V + 5V source (no idea ton make this source)?
Sorry for my poor english.
Thanks
- pburgess
- Posts: 4161
- Joined: Sun Oct 26, 2008 2:29 am
Re: NeoPixel Rings problems
The "5V logic" is a simplification, for the sake of brevity in the tutorials. This is assuming a 5V power supply for the pixels.
More accurately, the logic voltage must be at least 0.7 * Vdd. With a 5V power source, that means 3.5V or better, which is why 3.3V devices won't work.
If Vdd into the pixels is lower (the datasheet says they're good down to 3.5V), the logic threshold is correspondingly lower and may be reasonable for a 3.3V device, in which case no level shifting is needed. For example, 3.7V LiPo = = ~2.6V minimum logic level (but anything up to Vdd -- 3.7V --is also acceptable).
More accurately, the logic voltage must be at least 0.7 * Vdd. With a 5V power source, that means 3.5V or better, which is why 3.3V devices won't work.
If Vdd into the pixels is lower (the datasheet says they're good down to 3.5V), the logic threshold is correspondingly lower and may be reasonable for a 3.3V device, in which case no level shifting is needed. For example, 3.7V LiPo = = ~2.6V minimum logic level (but anything up to Vdd -- 3.7V --is also acceptable).
Please be positive and constructive with your questions and comments.