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I am doing some light testing with a small 8 pixel ws2812b strip. I'm wondering if there is any risk of damaging the arduino (nano) by driving the 8 pixels directly off the 5v pin (rather than an external power source). I'm using this pin to simplify the test environment. Eventually more pixels would be driven by a USB battery bank (which would also power the arduino).

Using my DMM, I'm only seeing about 90 mA draw for the 8 pixels. I think that should be fine, but I'm still new to this device and don't want to do something dumb that would burn it out needlessly.

Everything else is as per the recommended layout

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As long as you make sure the max draw of full RGB white is not drawn for all 8 at any given time, you should be within the Limits of the on board 5V regulator. Since this draw depends on your code, you can easily make sure that all 8 leds are not on 100% full draw at the same time. At 65 ~ 70 mA full draw, (20mA red, 20mA blue, 20mA green, and <10mA for the WS2812 itself) times 8, a 525 to 560 mA load at full white, you could have 7 fully on at any given moment without major malfunction. The ATMega on the Arduino itself should take under 50 mA worst case.

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