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Micro R3 ATmega32u4 Microcontroller Board With USB Cable For Arduino Description: This Arduino compatible Micro is similar to the Arduino Leonardo in that the ATmega32u4 has built-in USB communication， eliminating the need for a secondary processor. This allows the Micro 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: http:\/\/arduino.cc\/en\/Guide\/ArduinoLeonardoMicro?from=Guide.ArduinoLeonardo) This Arduino compatible Micro 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， an ICSP header， and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a micro USB cable to get started. It has a smaller form factor that enables it to be easily placed on a breadboard. Specification: Microcontroller: ATmega32u4 Operating voltage: 5V Input voltage (recommended): 7V - 12V Input voltage (limits): 6V - 20V Digital I\/O pins: 20 PWM channels: 7 Analog input channels: 12 DC current per I\/O pin: 40mA DC current for 3.3V pin: 50mA Flash Memory: 32KB(ATmega32u4) of which 4 KB used by bootloader SRAM: 2.5KB(ATmega32u4) EEPROM: 1KB(ATmega32u4) Clock speed: 16MHz Technical support: Arduino Leonardo home page: http:\/\/arduino.cc\/en\/Main\/ArduinoBoardMicro Arduino IDE download: http:\/\/arduino.cc\/en\/Main\/Software ATmega32u4 (datasheet): http:\/\/www.atmel.com\/dyn\/resources\/prod_documents\/7766S.pdf Arduino programming reference link: http:\/\/arduino.cc\/en\/Reference\/HomePage Arduino Leonardo guidance document: http:\/\/arduino.cc\/en\/Guide\/ArduinoLeonardo Package included: 1 x Arduino Compatible Micro R3 1 x USB cable