0

I'm really new at this, and here is my doubt. What if I need to light 120x WS2812B (5v)LEDs (link: LEDs) using an Arduino Nano? if it takes 60 mAh each pixel, the total amount needed should be around 7,200 mA.

Could I use the same 5V/ 8A power supply (PowerSupply) for the Nano board and lights? Is that possible?

Thanks in advance, and sorry my ignorance on this area.

1
  • 1
    Check your units. Charge (e.g. in mAh a unit of electrical capacity, or how much current can be supplied over a given time). Current is the rate of charge flow (e.g. in mA). As written your question does not make sense.
    – MichaelT
    Apr 29, 2019 at 15:22

2 Answers 2

0

Yes, 120 LEDs * 60 mA = 7200 mA = 7.2A

An Arduino Nano will use 19 mA (Arduino Nano Tech Spec). Of course, if you add a power LED, or other components it will add, but it will likely be less than a few 100 mA. So that totals to max 7.4A.

It's always good to have some headroom which is 0.6A in your case (that's enough).

Actually what's happening is as follows: - Your 8 mA gives the current the components request - Your Nano requests 19 mA - Your LEDs require 7.200 mA.

As long as the voltage is the same (5V for both the LEDs, Nano, and adapter), and the components do not request more than 8 A summed up (with some headroom), the adapter will deliver the current needed. If all components request more than 8 A, than high likely the adapter will break (and possibly the attached components too).

3
  • 1
    Thanks Michel, I just wanted to make sure that I don't burn the board on my first attempt ;)
    – juasmilla
    Apr 29, 2019 at 15:24
  • You're welcome .. .you can wait for more answers, if an answer is helpful, upvote it, if the answer answers your question in a satisfactory way, accept the answer. Apr 29, 2019 at 15:27
  • @juasmilla, why would you think that you would burn the Nano? .... how are you planning to connect the LEDs?
    – jsotola
    Apr 29, 2019 at 15:43
0

It can supply both, as long as they are supplied separately; the LEDs must not be supplied through the Nano board, but connected directly from the power supply.

2
  • Fine, connecting the ground on both I suppose... Thanks for all your inputs! brilliant Arduino World, and of course, its community!!
    – juasmilla
    Apr 29, 2019 at 15:48
  • @Yes connect ground together Apr 29, 2019 at 15:50

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.