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Hi. Arduino gemma Vout has the same voltaje as the power supply has, Isn´t it.
If the power supply is 3.7V. Could you have problems connecting this pin to neopixel?
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We noticed you attached photosto your comment.
NeoPixels can safely be run at 3.7V, and I bet you won't even notice that they are slightly dimmer.
داداچ.نئو پیکسل چیه؟اشتباه نمیزنی؟
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