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This conductive fabric has different resistance in each direction: 46 ohms per foot across the rows (stretchier direction) and 460 ohms per foot across the columns (less stretchy direction)
it should be simple to adapt it to any other microcontroller
Our detailed NeoPixel Uberguide has everything you need to use NeoPixels in any shape and size
but if you need one
The LEDs themselves do not connect to the Feather
Adafruit Mini 0.8" 8x8 LED Matrix w/I2C Backpack - Pure Green DC This conductive fabric has differentWhat's better than a single LED? Lots of LEDs! A fun way to make a small display is to use an 8x8 matrix or a 4 digit 7 segment display. Matrices like these are 'multiplexed' so to control 64 LEDs you need 16 pins. That's a lot of pins, and there are driver chips like the MAX7219 that can control a matrix for you but there's a lot of wiring to set up and they take up a ton of space. We feel your pain! After all, wouldn't it be awesome if you could