Arduino Micro without headers

The Micro is a microcontroller board based on the ATmega32U4, developed in conjunction with Adafruit. 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, 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 form factor that enables it to be easily placed on a breadboard.

The Micro board 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.

• Microcontroller: ATmega32U4
• Operating voltage: 5 V
• Input voltage (recommended): 7-12 V
• Input voltage (limit): 6-20 V
• Digital I/O pins: 20
• PWM channels: 7
• Analog input channels: 12
• DC current per I/O pin: 20 mA
• DC current for 3.3 V pin: 50 mA
• Flash memory: 32 KB (ATmega32U4) of which 4 KB used by bootloader
• SRAM: 2.5 KB (ATmega32U4)
• EEPROM: 1 KB (ATmega32U4)
• Clock speed: 16 MHz
• Built-in LEDs: 13
• Length: 48 mm
• Width: 18 mm
• Weight: 13 g