Arduino Nano Every and WS2812B

[alto777]

Yay!

a7

[Deva_Rishi]

@mariusz2022

Omg Thanks It was it

You may have damaged the Dout of the final LED when connecting to it as if it was an input, but if that is the last LED in the chain that doesn't matter. I do want to make very clear that the 5v USB you are now using to power both the Nano and the LED-strip is limited to 500mA (for all devices connected to that Hub) which is not very much, and not the best to power LED-strip

[alto777]

@Deva_Rishi

You may have damaged the Dout of the final LED when connecting to it as if it was an input

Yes, keep in mind that you did that. For example, I have ICs that work, but have a note on them like “been too hot” to remind myself that I have a potential problem in the future, and to not use that in any way critical.

But if you always had the resistor (hmm!) in the circuit, it may have kept that from happening.

a7

[Deva_Rishi]

@alto777

I have ICs that work, but have a note on them like “been too hot” to remind myself that I have a potential problem in the future, and to not use that in any way critical.

I keep IC's that i use in development separate from the ones i use in usable projects. But if in doubt i actually just chuck them in the bin.

[sterretje]

@Deva_Rishi

You may have damaged the Dout of the final LED when connecting to it

The resistor might have saved the strip

@killzone_kid

How come? The data sheet only specifies that DIN should be

One possible reason can be that it prevents the strip from being powered from the Din pin when the controller is on but the strip is off.

[alto777]

I stopped resisting <- see what I did there? some time ago, dunno if this thread was the last time I even bothered to wonder anymore

Neopixel Resistor Question

I was just reading on this tutorial on Adafriuit, Best Practices | Adafruit NeoPixel Überguide | Adafruit Learning System It says Place a 300 to 500 Ohm resistor between the Arduino data output pin and the input to the first NeoPixel. The resistor should be at the end of the wire closest to the NeoPixel(s), not the microcontroller. Some products already incorporate this resistor…if you’re not sure, add one…there’s no harm in doubling up! Could someone explain why "The resistor should be at …

HTH

a7

[killzone_kid]

I’m planning to power 8 pixels from 3.3v and use 3.3v board, do you think resistor might be risky here?

[Deva_Rishi]

@killzone_kid

do you think resistor might be risky here?

It is never risky.

@killzone_kid

I’m planning to power 8 pixels from 3.3v and use 3.3v board

Well WS2812b's aren't quite as bright at 3.3v

[killzone_kid]

@Deva_Rishi

quite as bright at 3.3v

I found them painfully bright at 5v and full throttle so no problem

[alto777]

If they work at all. Never tried, but the data sheet or a data sheet, such as it is, sez

Power supply voltage VDD+3.5~+5.3 Volts

so you’ll need a level shift on the data line, traditional or hack, and you’ll want to just use 5 volts power.

But try it and see and tell us how it works.

a7

[Wawa]

@killzone_kid

I’m planning to power 8 pixels from 3.3v and use 3.3v board

You will have some red-shift, which is also seen with poor supply/wiring and long strings.

The blue and green LEDs have a higher Vf (working voltage) than the red LEDs,
which makes them to go dimmer with voltage deprivation before the red LEDs do.
Leo..

[sterretje]

@killzone_kid

I’m planning to power 8 pixels from 3.3v and use 3.3v board

No experience with 3.3V on WS2812Bs. It's my understanding that it might work although outside its specs; general advise is to use 74HCT14s as level shifters and use 5V for the HCT and the strip.

[Deva_Rishi]

@alto777

If they work at all. Never tried,

Yes they do.

@Wawa

You will have some red-shift, which is also seen with poor supply/wiring and long strings.

The blue and green LEDs have a higher Vf (working voltage) than the red LEDs,
which makes them to go dimmer with voltage deprivation before the red LEDs do.

Yes significantly less brightness on the Blue channel.

@sterretje

. It's my understanding that it might work although outside its specs; general advise is to use 74HCT14s as level shifters and use 5V for the HCT and the strip.

If possible that is the proper way to do it.