Would you like to learn electronics, with an all-in-one board that has sensors and LEDs built in? Circuit Playground is here - and it's the best way to practice programming on real hardware with no soldering or sewing required! This is the Classic version of Circuit Playground , which comes with an ATmega32u4. It's designed to be used with Arduino IDE and code.org CS Discoveries only. It even comes with Firmata already programmed in, so you can use it immediately with code.org Discoveries without any preparation or updates.