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I have a project where I'm looking to power 120 RGB LEDs in a strip (WS2812B).

Obviously an Arduino Micro cannot supply this amount of current so I'm looking to use an external 5V/4A switching power supply (wall-wart) to power the LED's as well as the Arduino.

My question is, can I just split the power from the wall-wart providing 5v_reg directly to the 5V pin on the Arduino Micro and 5v_reg to the LEDs Vss?

It it necessary to use extra bypass capacitors in this case?

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My question is, can I just split the power from the wall-wart providing 5v_reg directly to the 5V pin on the Arduino Micro and 5v_reg to the LEDs Vss?

Yes. As long as it is a clean regulated 5V supply.

It it necessary to use extra bypass capacitors in this case?

No.

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  • Great. Are there specified limits as to what voltage range is acceptable to apply to the 5V pin, assuming the regulated supply is non ideal? Commented Aug 12, 2016 at 17:44
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    The datasheet for the ATmega32U4 seems to suggest VCC = 2.7V to 5.5V although I'm not sure on this. Commented Aug 12, 2016 at 17:49
  • That is correct. However at lower voltages you run into instability with the clock being too fast. Best stick to 4.5V - 5.5V. Commented Aug 12, 2016 at 17:50

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