I’m after a 4 core cable that is flexible. It will connect BNO85 to PCB via I2C - using STEMMA QT connectors. Is the easiest solution to splice with short wires that have the STEMMA QT connectors already attached? Or should I crimp the wires? Or is there another option?
The wires will need to be long in length (1m-2m) and will be used in a wearable application where the BNO85s will be on the legs and PCB will be on the wrist (the wires will be “embedded” in the clothing. I have run the code with this wire length and with some error handling, it works with this wire https://au.element14.com/pro-power/ac-t3-4c-blk-100m/alarm-cable-4-core-type-3-black/dp/3382516- but it is not flexible enough.
Core has a similar item but it appears that it is only available in 1M lengths, and I presume you don’t want joins in the middle of the run.
Crimping the wires for yourself is by far the best option as you get exactly what you want. If you haven’t done it before then allow for a bit of practice. It’s not difficult but there is definitely a knack to it.
You’re on the right track looking for flexibility, silicone-insulated wire is truly the way to go for wearables. PVC-based alarm cable is too stiff for embedding in clothing.
If you want to use the Adafruit-style silicone ribbon cable or similar, here’s how you can do it cleanly:
Option 1: Splice pre-crimped pigtails: You can buy JST-SH pigtails (STEMMA QT style) and solder or splice them onto your silicone ribbon. It’s the quickest way, but makes a joint in the garment.
Option 2: Crimp your own ends: This is my go to for most projects I do. It provides a durable connection and after doing a few you start to get the hang of it. We’ve got a wide range of crimpers, from the lower end SN-01B up to the Pololu 1929
If you find something that suits then silicon 4-core stranded cable would work fine. The advantage of the ribbon cable is that it lays flat under clothing, and is more flexible because it doesn’t need the extra sheath to contain the cores.
