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April 19, 2016 at 6:16 am
#2581

Keymaster
Sorry for my absence. The level shifter is for the LEDs — and in the case of NeoPixels, it’s only for the data line (sorry I said clock and data). See here…
If you’re using a Teensy LC it has a level shifter built in for this exact purpose on the bottom row. It’s the pin that says “17 at VIN voltage.”
https://www.pjrc.com/teensy/teensyLC.html
I don’t know if this is the cause of your problem but it could be, and you’ll want to run the data through a level shifter to avoid problems regardless.