OLIMEXINO-32U4 Development Board Olimex OLIMEXINO-32U4 Development Board is an Arduino Leonardo-like board powered by the Atmel ATMega32U4 microcontroller. It is a powerful starter board for the Arduino family, enabling code development of applications running on the ATMega32U4. The Leonardo design has an all-in-one USB communication with no need for an external FTDI chip, as the MCU directly handles the virtual COM. OLIMEXINO-32U4 offers ultra-low power consumption, which makes it ideal for handheld and battery-powered applications. The Li-Ion rechargeable battery power supply option with a built-in onboard charger keeps the battery automatically charged until another power source (USB or external adapter) is removed. Then it automatically powers the board, no jumpers or switches required.