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In the previous post, I got everything working pretty nicely with the basics on the board - we had flashed a working MicroPython build, and had a simple piece of code that exercised the NeoPixel LEDs. Since writing that post, I also created a reference card (image above - there's a PDF, and the source GoodNotes file, on GitHub as well); and updated the code a little to add a test for the onboard status LED and programmable button.
We have 25 WS2812B LEDs, on a small device that we can power via USB and connect to the interwebs... so clearly, I had to do something with that. Using the Cheerlights project, I also got to drive the whole thing using both two more of my favourite technologies: Twitter, and MQTT.