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4" spread covered neo pixels strings
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4" spread covered neo pixels strings

by Sam_papineau on Thu Mar 05, 2020 1:18 am

My girlfriend is lighting up a coat with 4-in spread LED neopixel strings. She plans to use four or five strings. that would equal 80 to 100 lights. What is the best board for powering all of these or should they be powered independently? We've bought the lights but haven't figured out which board will be best. We have a large supply of 18650 lithium ion batteries as well. I'm hoping I can use these and make her jacket light up for 12 plus hours.

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Re: 4" spread covered neo pixels strings

by adafruit_support_bill on Thu Mar 05, 2020 6:48 am

With that many pixels, it is best to run power directly to the pixels. If you want to use a single power supply, you can run power from the pixels back to the display.

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Re: 4" spread covered neo pixels strings

by Sam_papineau on Thu Mar 05, 2020 1:31 pm

Which board is best for control? Would 3 parallel 18650s run these? Does the board need its own power supply?

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Re: 4" spread covered neo pixels strings

by adafruit_support_bill on Thu Mar 05, 2020 1:41 pm

Which board is best for control?

Most any board can handle 100 pixels. For wearables, the Feather processors are nice and compact. The M0 Basic Proto would be a good choice.
https://www.adafruit.com/product/2772

Would 3 parallel 18650s run these?

Not a good idea to make your own battery packs from loose cells. Particularly not for a wearable. To avoid the hazards of an unbalanced pack, it is best to work with packs made from factory matched and balanced cells. Our 6600mAh pack is made from 3 factory matched and balanced 18650 cells.
https://www.adafruit.com/product/353

For a typical wearable project with 100 pixels, 6600mAh should give you at least 2 hours run-time. Possibly more : https://learn.adafruit.com/sipping-power-with-neopixels

Does the board need its own power supply?

As noted in my previous post: If you want to use a single power supply, you can run power from the pixels back to the display.

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Please be positive and constructive with your questions and comments.