Difference between Arduino Uno and Leonardo

The Arduino UNO and Arduino Leonardo are both popular open-source microcontroller boards, but they have some key differences.

Microcontroller:

The Arduino UNO uses the ATmega328P microcontroller, while the Arduino Leonardo uses the ATmega32u4 microcontroller. The ATmega32u4 has more features than the ATmega328P, including built-in USB support, more analog inputs, and more PWM outputs.

USB:

The Arduino UNO uses an external USB-to-serial converter chip, while the Arduino Leonardo has built-in USB support. This means that the Arduino Leonardo can be used as a USB device, such as a mouse or keyboard.

Pins:

The Arduino UNO has 14 digital pins and 6 analog pins, while the Arduino Leonardo has 20 digital pins and 12 analog pins. The Arduino Leonardo can also use its analog pins as digital pins, giving it a total of 26 digital pins.

Other features:

The Arduino Leonardo also has a few other features that the Arduino UNO does not, such as:

  • A reset button that can be used to restart the microcontroller

  • A dedicated ICSP header for programming the microcontroller

  • A higher clock speed (16 MHz vs. 16 MHz)

Which one is better?

The Arduino UNO is a more popular choice for beginners, as it is more widely available and there are more tutorials and resources available for it. However, the Arduino Leonardo is a better choice for projects that require built-in USB support or more features.

Here is a table summarizing the key differences between the Arduino UNO and Arduino Leonardo: