NeoPixel & MakeCode | adafruit | Page 1

patent bobcat Oct 30, 2021, 12:49 AM

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grand stone Oct 30, 2021, 12:51 AM

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Are you using a level shifter for the data line ?

patent bobcat Oct 30, 2021, 12:51 AM

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No not at all!

grand stone Oct 30, 2021, 12:52 AM

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Some neopixel strips use a version of neopixels are want 5V data signals

patent bobcat Oct 30, 2021, 12:52 AM

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Yes I've read something like this in documentation but don't understand how to implement.

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Also super appreciate your attention!!

grand stone Oct 30, 2021, 12:53 AM

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So like ws2812b or the RGBW versions of them which I think is ws2813 would need to shift the logic level from 3.3V of the CPX and the strip

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https://www.adafruit.com/product/395

8-channel Bi-directional Logic Level Converter

Because the Arduino (and Basic Stamp) are 5V devices, and most modern sensors, displays, flashcards, and modes are 3.3V-only, many makers find that they need to perform level ...

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Something like this would work perfect

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John Park has a few good videos on level shifting neopixels

patent bobcat Oct 30, 2021, 12:54 AM

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Hmm how does this incorporate with a CPX?

grand stone Oct 30, 2021, 12:55 AM

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So what you do is put 3V to the low voltage side, 5V from the neopixel strip to the high voltage side

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Then take your data line from the CPX to the low voltage side, and then take the high voltage data signal and put it to the neopixel strip with a 330ohm or 470ohm resistor

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Let me find the video from John park. He explains it very well

patent bobcat Oct 30, 2021, 12:56 AM

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Thank you!!

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I was in paint trying to draw a schematic

grand stone Oct 30, 2021, 12:57 AM

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https://youtu.be/y6HiDnyhRa0

YouTube

Adafruit Industries

John Park's NeoPixel Level Shifter @adafruit @johnedgarpark #adafruit

Solve microcontroller-to-NeoPixel mismatches with a level shifter. 3v3 micros can talk with 5V NeoPixels, they just need a translator. That translator is the ever handy logic level shifter. Often, a mismatch of logic levels can cause strange behavior, such as dim or wrong-colored pixels -- especially on longer wire runs or in projects that use l...

▶ Play video

patent bobcat Oct 30, 2021, 12:57 AM

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Also if I'm understanding correctly, my issue boils down to powering the strip, is that right?

grand stone Oct 30, 2021, 12:58 AM

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Well, the strip will need 5V, preferably from a separate source than the CPX

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Connect the ground of the CPX to the ground of the 5V neopixel source. Then use that level shifter to shift your data signal to the neopixel strip

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The video explains everything:)

patent bobcat Oct 30, 2021, 12:59 AM

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Okay lemme watch this 5 min vid then bother you with more questions! Bless you for being online!!

grand stone Oct 30, 2021, 1:00 AM

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You’re very welcome! I do a lot with neopixels anymore so I’ve found and revisit these videos frequently 🙂

patent bobcat Oct 30, 2021, 1:18 AM

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Okay this video was helpful in terms of demystifying the process. And it looks like no additional code necessary, just be mindful of where you plug things in. I realize now that I'm going to need a breadboard to hold the level shifter in place and solder my CPX leads into place, so something new I hadn't expected but doable.

I made a circuit diagram on paper, do you mind looking it over?

grand stone Oct 30, 2021, 1:24 AM

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Looks right

patent bobcat Oct 30, 2021, 1:26 AM

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Awesome, thanks so much!!!

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