NeoPixel Wire Harness #ElectronicHalloween « Adafruit Industries - Makers, Hackers, Artists, Designers and Engineers!

NeoPixel Wire Harness #ElectronicHalloween « Adafruit Industries – Makers, Hackers, Artists, Designers and Engineers!

in the ongoing saga (Part 1And the Part 2) from this NeoPixel-adorned Halloween costume… will quickly focus on one narrow topic here. There’s an event this weekend, and if I’m really scrambling, I might have something partially wearable by then (although the Learn guide and other posts will still follow later). I’m between ‘prototype’ and ‘finished’ wires right now and wanted to pass along some tips about it Wiring in large NeoPixel projects.

Over the years, between Adafruit and personal projects, I developed hundreds From NeoPixel strips in things. Not only fixed length prefab strips, but mostly Cut and assemble custom sizes from complete spools. The NeoPXL8 Library and associated deviceswith 8 strips in parallel, speed up this use.

It’s rare for me to connect these strips directly to the microcontroller or driver. Strips sometimes take a little abuse… Solder pads may break, sometimes a pixel can fail and not transfer data to anything else down the line, so Quick replacement is desirable. Although, I often want the parts to be like that reusable In other things, like with this Halloween project where some of the LED lights can be reused for a Christmas display later. And so I will merge JST SM 3-Pin Connectors where possible.

So here’s a puzzle: Given that the wires in this outfit (and in Festive Ice Project) are all different lengths… is it better to have the same length jumper wires on all the strips and varying length wires for the driver… or a varying pigtail for each strip and the same length on the driver?

My preference, when possible, is Pigtails of the same length on the strips. Especially when reusing parts between projects, or building a few spare slides. It’s not about signal safety (a small difference), just convenience. If everything on the strips is the same size and length, interchangeability becomes much easier! Worst case, one might take a long strip and cut the tail end shorter, but the “head end” is still a good fit for everyone.

Another riddle: JST connectors are “gender” – there is a pin end and a socket end. Better to have pins on the bar or driver side?

With most off-the-shelf strips, including those from Adafruit, the industry appears to be pretty standardized in setting Socket at the end of the head of tape and pins to the driver or tail end. This is convenient because you can hook up the jumper wires directly for quick testing and prototyping.

But on my own projects, I always go the other way: Pins in the head of the tape and the socket on the driver and/or the tail end of the tape. For the same reason electrical extension cords are routed the way they are: so there is no live voltage on the exposed terminal. Although the JST connectors are covered, the workbench is often cluttered with screwdrivers, nuts, bolts, soldering points, and other small pieces that can go in there. I don’t recall a case of this actually happening, but it’s a possibility. This unfortunately means that commercial LED strip testers/drivers won’t connect directly to my projects, so I tend to keep some pigtails blank. It’s all just personal preference, not a law of nature.

None of this is likely to be a problem with occasional NeoPixel projects, it’s only when things start to get out of hand. Another practice I’ve had is buying blank JST SH caps and pins in bulk from Digi-Key, and screwing up my connectors:

JST pigtails are still really handy for tape ends of the same length mentioned earlier. But for the end of the wire harness of varying length… in the past I’ve soldered the opposite pigtail and heat-shrunk, but it’s cleaner (and with practice, faster) to crimp it. a Good crimper tool Not cheap but So Worth it when working with large amounts.

As things stand right now on the Halloween Harvester Project: NeoPixel strips were attached to the cloak, the model wire assembly (recycled from the Icicle Lights project) was removed and replaced with the final wires, after which the ends are cut to a uniform length and attached to the NeoPXL8 feathered wing.

Stop breading and soldering – start building right away! Adafruit’s Circuit is filled with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with MakeCode Drag and Drop Programming SiteLearn Computer Science with the CS Discoveries class at code.org, go to Circle To learn Python and hardware together, TinyGO, or even use the Arduino IDE. Speed ​​Circuit Stadium It is the latest and best circuit board board, with support for CircuitPython, MakeCode and Arduino. It has a powerful processor, 10 NeoPixels, a mini speaker, an InfraRed transmitter and receiver, two buttons, a switch, 14 alligator clip pads, and a lot of sensors: capacitive touch, near infrared, temperature, light, motion and sound. A vast world of electronics and coding awaits, and it fits in the palm of your hand.

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