the package for extra possible color mixes and selectable white color temperature (the company sells single NeoPixels with a 6000 K, 4500 K and 3000 K color temperature). CircuitPython In January, 2017, Adafruit introduced CircuitPython, a fork of the MicroPython programming language optimized to run on select Adafruit products. CircuitPython currently runs on Adafruit boards with a flash memory chip and one of the following microcontrollers: Atmel SAMD21 (M0), Atmel SAMD51 (M4), and the Nordic Semiconductor nRF52840. In 2019, resources for CircuitPython were moved to circuitpython.org, a move to show that the number of third-party boards using CircuitPython had grown beyond those only manufactured by Adafruit. This includes both CircuitPython for microcontrollers and CircuitPython on single-board computers using a compatibility layer Adafruit named "Blinka", to access general-purpose input/output functionality and compatibility with a library of over 160 sensors and drivers. Feather development boards The Feather development boards constitute Adafruit's broadest platform of "Arduino-like" boards. The boards all share similarities in that they have the same form factor, same pinout, similar microcontrollers, and feature lithium polymer battery charging. Certain boards have special features in addition to the microcontroller breakout, such as Bluetooth, Wi-Fi or cellular network connectivity or built-in prototyping space or SD card communication. The name "Feather" comes from the fact that the boards are small, thin, light and easily powered from a battery. In addition to the boards themselves, Adafruit engineers and manufactures "FeatherWings", which are expansion cards allowing the addition of features such as an LCD, a NeoPixel array or DC motor drivers. Adafruit Learning System In addition to manufacturing and selling electronic devices, Adafruit regularly publishes tutorials featuring their products. The tutorials show how to build projects, highlighting their products' abilities and strengths. The site hosts close to 2400 guides and articles written by collaborators. The guides range from teardowns of existing wearable electronic devices to 3D printing projects to overview and introduction of Adafruit merchandise and how to build projects. Presence on YouTube Adafruit Industries has a substantial presence on the online video streaming website YouTube. The channel has been active since April 2, 2006. The company was awarded a YouTube Silver Play Button in August 2015 for having surpassed 100,000 subscribers and, as of October 2022, has 420,000 subscribers. Adafruit creates different types of videos, all on electronics, with most featuring one of their products. Each week, several live shows are streamed. Ask an Engineer