Build your own AVR playground
Before the rise of Arduino, microcontroller development boards had on-board peripherals like pushbuttons and LEDs, a display, one or more potentiometers for analog signals, extension connectors, etc. and, of course, a decent power supply. The goal of these boards was to provide an easy way to start learning the microcontroller without having to solder or add other components. The AVR Playground – an open source, open hardware project – was designed with this in mind, and extended with things from Arduino that we have learned to appreciate.