What's an ATMegaZero?
The ATMegaZero is a microcontroller board based on the Atmel ATMega32U4 microchip, the same chip used in the Arduino Leonardo and Arduino Micro. The ATMegaZero gets its name from the fact that it is based around the 8-bit Microchip (née Atmel) ATmega32U4 microcontroller & the form factor of the Raspberry Pi Zero.
The ATMegaZero comes with a built-in USB which makes the ATMegaZero recognizable as a mouse or keyboard.
Works out of the box with the Arduino IDE (Win/OSX/Linux)
Side by Side
The ATMegaZero was modeled after the Raspberry PI Zero to take advantage of its sleek design and form factor but in the form of a microcontroller board. Similar to the Raspberry Pi Zero the ATMegaZero comes with 40 GPIO pins that can be used as input or output for interfacing devices and can be programmed using the Arduino IDE software.