Electronics Engineering (ELEX) Board Practice Exam

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Which microcontroller is used in Arduino Leonardo?

ATmega8
ATmega16
ATmega32u4
ATmega2560

The correct answer is: ATmega32u4

The microcontroller used in Arduino Leonardo is the ATmega32u4. This chip is part of the AVR microcontroller family, and it is designed specifically for USB communication, which allows the Leonardo to act as a keyboard, mouse, or other USB device directly. One of the key features of the ATmega32u4 that makes it particularly suitable for the Leonardo is its built-in USB functionality, enabling simplified connections to the computer without needing additional hardware. This capability allows developers to easily create projects that require human interface devices (HIDs) or communicate data back and forth with a connected computer. The integration of USB within the microcontroller also helps save space on the PCB and cuts down costs since a separate USB controller is not needed. In contrast, other microcontrollers like the ATmega8, ATmega16, and ATmega2560, while they may serve well in different applications, do not have the same built-in USB support that distinguishes the ATmega32u4. Thus, for applications focusing on USB interaction, the ATmega32u4 is the optimal choice.