This project demonstrates how to use a color picker widget on adafruit.io to send a color selection to your Adafruit Feather connected to a 8x4 NeoPixel Matrix.

The incoming MQTT message contains the hex color in a format like "#00FB34" so this code splits it up in "00", "fb", and "34" and then converts those to their decimal equivalents.

Then it fills in the matrix with that color for a second.

Fill in your Wifi SSID and key. Then fill in your AdaFruit.IO credentials as well. Then compile and upload the sketch. Once it gets online, you'll see a big green "ON" on the matrix. (Or maybe a NO if you have it upside down).