These new NeoPixel rings from adafruit are really very good. A little strange to operate perhaps (they are like a shift register but they shift by re-transmitting downstream. Or to put it another way you would send the pixels as if they were drawn out on a TV screen (which is not the way a shift register works if you think about it).
Initially, I wrote some PASM code for a Parallax Propeller (P8X32A) chip to make some interesting colour patterns appear on the ring. This was quite easy with the aid of a Saleae Logic probe.
But the problem with the Propeller is that it’s a very expensive chip and is COMPLETE overkill for making some fancy patterns on a bunch of LEDs. No, instead I wanted to use a smaller chip to run the LEDs from.
Long story short, I’ve written an very simple ATTiny85 demo assembly code program for showing a pattern on the NeoPixel Ring. It shows a stationary pattern of 5 reds, 5 greens, and 5 blues, all of increasing brightness, and a single white LED showing an equal mix of the three colours.
For those who don’t want to use the Arduino IDE with our NeoPixels, here is a AVRstudio project solution! Learn more.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.