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General • Neopixel with 5v supply problems

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I am trying to run approx 102 LEDS, using a Pico2 as controller. I'm pretty new to this, but have done a lot of reading!
When I power the LED strips straight from the pico, they are working perfectly, but everywhere I read says it should power them with 5v PSU. So I have tried this - and they just go mad everytime. There is crazy flashing white across all the LEDs, and even super simple code telling them to switch off makes them light up white.

I have the Adafruit Pixel Shifter in the data line, supposedly shifting the Data signal to 5v, but that doesn't fix it. I have everything grounded...

Any suggestions really welcome! I have tested as much as I possible can with the multimeter and everything seems to be acting correctly, except the LEDs!

Thanks!
Tom

Statistics: Posted by tomstone251 — Fri Jan 30, 2026 3:36 pm — Replies 4 — Views 58



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