This lists all the little features of the Circuit Playground Express, tailored to it (so you can say cpx.red_led instead of assigning D12, etc.)

RT @adafruit: New Learn Guide: Explore Magic Cap, a smartphone OS from a decade before the iPhone @adafruit #adafruit

Accessibility Color Contrast Checker

Colorblind Web Page Filter website

web design color accessibility guidelines

They operate over a generic 2-wire SPI bus which removes the need for a finicky transfer speed and allows for data transfer at 8-32Mhz rather than 800Khz. The APA102 chip uses PWM rates of 19.2Khz which allows DotStar LEDs to be used in Persistence of Vision (POV) displays and smoother PWM fading. However instead of only requiring a single pin to transfer data, the DotStar LEDs require two, so let’s take a look at how to use them.

Basically the NeoPixel library came first, is simple to install and use, and Adafruit supports it; making things simple if you are a beginner and buy from them. Note that even the Adafruits NeoPixel Uberguide recommends FastLED for advanced use. Some of their tutorials use it instead of the NeoPixel library.

Learn how to design enclosures with snap fit covers! Use autodesk Fusion 360 to create a parametrically driven project case for electronics.

nordic M4 chip with BLE and USB, runs freeRTOS

The Raspberry Pi has an on-board audio jack, which is super handy for all kinds of sound effects and speech, just plug and go! However, for when you want better audio for music playback, a USB audio card can greatly improve the sound quality and volume, this tutorial will show you how.

This guide will also show you how to record audio via the headphone jack on the adapter