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Help me calculate neopixel power.
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Help me calculate neopixel power.

by ixxxxu on Fri Aug 23, 2019 6:31 am

Hello, I'm going to make a 360 degree linked matrix with 32 x 192 arrays.

The module I'm going to use is a flexible 16x16 NeoPixel RGB LED Matrix.

And I want to use Teensy 3.2 or 3.7 for control.

I'm curious about the volts and ampare of external power that should be provided to the Neo-Pixel.

The product description says not to exceed 15A,

How do we supply external power?

Product Link
https://www.adafruit.com/product/2547

Control Program - Madmapper
https://www.youtube.com/watch?v=er_PZZw ... e=youtu.Be

Please answer.

Thank you!

ixxxxu
 
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Re: Help me calculate neopixel power.

by adafruit_support_bill on Fri Aug 23, 2019 8:07 am

The product description says not to exceed 15A,

Actually, it recommends not to exceed 5A per panel.

Don't forget, with 256 LEDs, you could use over 15A of current if you turn on all the LEDs on to white (which we really do not recommend because we don't think the flex PCB can handle that much current). Try to keep the current draw at undrer 5A,


Each pixel is capable of drawing up to about 60mA if driven at full intensity white. And 256 pixels * 60 mA is 15,360 mA or 15.36A. However, the power and ground traces on the flexible backing are not capable of sustaining such a high current level, so we recommend that you keep it below 5A.

In other words, your software should attempt to keep the average pixel intensity to no more than 1/3 of maximum. You can have all of them at 1/3 intensity or 1/3 of them at full intensity but the rest turned off. Or anything less than that.

There are power and ground pads on the back of each panel. You should run a power feed to each panel. A 5v 10A supply like this could power up to 2 panels: https://www.adafruit.com/product/658

When using multiple supplies, connect only the signal and ground between panels powered by different supplies.

Image

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