The classic Arduino board that can act as a mouse or keyboard. The Arduino Leonardo is a microcontroller board based on the ATmega32u4 (datasheet). It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analogue inputs), a 16 MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started. The Leonardo differs from all preceding boards in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Leonardo to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port. It also has other implications for the behaviour of the board; these are detailed on the Getting started with the Arduino Leonardo. Getting started Find inspiration for your projects with Leonardo board from the tutorial platform Project Hub. The Getting started with the Arduino Leonardo page contains all the information you need to configure your board, use the Arduino Software (IDE), and start tinkering with coding and electronics. From the Tutorials section, you can find examples from libraries and built-in sketches as well as other useful information to expand your knowledge of the Arduino hardware and software Resources * Development Environments * Arduino IDE * Arduino CLI * Arduino Web Editor * Arduino IoT Cloud * Getting Started * Project Hub * AVR Boards Tutorial Specifications Microcontroller ATmega32u4 Operating Voltage 5V Input Voltage (Recommended) 7-12V Input Voltage (limits) 6-20V Digital I/O Pins 20 PWM Channels 7 Analog Input Channels 12 DC Current per I/O Pin 40 mA DC Current for 3.3V Pin 50 mA Flash Memory 32 KB (ATmega32u4) of which 4 KB used by the bootloader SRAM 2.5 KB (ATmega32u4) EEPROM 1 KB (ATmega32u4) Clock Speed 16 MHz Length 68.6 mm Width 53.3 mm Weight 20 g https://elecena.pl/product/22718990/arduino-leonardo-with-headers 2023-03-07 https://elecena.pl/product/22718990/arduino-leonardo-with-headers 2023-12-27 https://elecena.pl/product/22718990/arduino-leonardo-with-headers 2024-04-17 https://elecena.pl/product/22718990/arduino-leonardo-with-headers 2024-09-19 https://elecena.pl/product/22718990/arduino-leonardo-with-headers 2024-11-29 https://elecena.pl/product/22718990/arduino-leonardo-with-headers 2024-11-30 https://elecena.pl/product/22718990/arduino-leonardo-with-headers 2025-06-11 https://elecena.pl/product/22718990/arduino-leonardo-with-headers 2025-11-28 https://elecena.pl/product/22718990/arduino-leonardo-with-headers 2025-11-29