Arduino Leonardo 32u4 is a microcontroller board base on the ATmega32u4 (datasheet).

It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator. A

micro USB connection, a power jack, an ICSP header, and a reset button.

It contains everything need to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get start.

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 connect computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port.

Arduino Leonardo 32u4 Arduino Development Board, Atmega32U4, Arduino Leonardo R3. With Solder Female Header in Pakistan

Arduino Leonardo 32u4 About

The Arduino Leonardo is a microcontroller board base on the ATmega32u4.

It has 20 digital input/output pins (of which 7 can be use as PWM outputs and 12 as analog 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 a AC-to-DC adapter or battery to get start.

USB communication

The Arduino Leonardo has built-in USB communication that allows the Micro to appear as a mouse/keyboard on your machine.

Battery Connector

The Arduino Leonardo features a barrel plug connector, that works great with a standard 9V battery to give extra power to your projects.

Here you will find the technical specifications for the en.wikipedia.org

It is recommended to use a control system to turn this functionality on, like a physical switch or only responding to specific input you can control. When using the Mouse or Keyboard library, it may be best to test your output first using Serial. Print(). This way, you can be sure you know what values are being reported. Refer to the Mouse and Keyboard examples for some ways to handle this.

Graph

Board	Name	Arduino® Leonardo
Microcontroller	ATmega32u4
USB connector	Micro USB (USB-B)
Pins	Built-in LED Pin	13
	Digital I/O Pins	20
	Analog input pins	12
	PWM pins	7
Communication	UART	Yes
	I2C	Yes
	SPI	Yes
Power	I/O Voltage	5V
	Input voltage (nominal)	7-12V
	DC Current per I/O Pin	10 mA
	Power Supply Connector	Barrel Plug
Clock speed	Processor	ATmega32U4 16 MHz
Memory	ATmega32U4	2.5KB SRAM, 32KB FLASH, 1KB EEPROM
Dimensions	Weight	20 g
	Width	53.3 mm
	Length	68.6 mm

Leonardo

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.

en.wikipedia.org