Arduino Leonardo with Headers [A000057] - Official Arduino

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 PWMoutputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USBconnection, a power jack, an ICSP header, and a reset button. It containseverything needed to support the microcontroller; simply connect it to acomputer with a USB cable or power it with a AC-to-DC adapter or battery to getstarted.The Leonardo differs from all preceding boards in that the ATmega32u4 hasbuilt-in USB communication, eliminating the need for a secondary processor. Thisallows the Leonardo to appear to a connected computer as a mouse and keyboard,in addition to a virtual (CDC) serial / COM port.Technical specifications :Microcontroller : ATmega32u4Operating Voltage : 5VInput Voltage (Recommended) : 7-12VInput Voltage (limits) : 6-20VDigital I/O Pins : 20PWM Channels : 7Analog Input Channels : 12DC Current per I/O Pin : 40 mADC Current for 3.3V Pin : 50 mAFlash Memory : 32 KB (ATmega32u4) of which 4 KB used by bootloaderSRAM : 2.5 KB (ATmega32u4)EEPROM : 1 KB (ATmega32u4)Clock Speed : 16 MHzLengh : 68.6 mmWidth : 53.3 mmWeight : 20 g