Arduino Leonardo with Headers
Description
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 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 started.
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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 behavior of the board; these are detailed on the getting started page.
Getting Started
You can find in the Getting Started section all the information you need to configure your board, use the Arduino Software (IDE), and start tinker with coding and electronics.
MicrocontrollerATmega32u4Operating Voltage5VInput Voltage (Recommended)7-12VInput Voltage (limits)6-20VDigital I/O Pins20PWM Channels7Analog Input Channels12DC Current per I/O Pin40 mADC Current for 3.3V Pin50 mAFlash Memory32 KB (ATmega32u4) of which 4 KB used by bootloaderSRAM2.5 KB (ATmega32u4)EEPROM1 KB (ATmega32u4)Clock Speed16 MHzLenght68.6 mmWidth53.3 mmWeight20 g
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Arduino Leonardo with Headers
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