The Pro Micro is basically a breakout board for the ATmega32U4 microprocessor, and is MUCH smaller than it’s older brother the Leonardo. The ATmega32U4 features a USB transceiver and allows us to add USB connectivity without the need for an external USB interface. This tiny little board features a 4 channel 10-bit ADC, 5 PWM pins, 12 Digital I/O’s, as well as hardware serial connections (Rx and Tx). If you’re supplying unregulated power to the board, be sure to connect to the “RAW” pin and not the “VCC” pin.
Features / Specs
- Microcontroller: ATmega32u4
- Crystal Frequency: 16MHz
- Operating Voltage: 5VDC
- Max Input Voltage on RAW Pin: 12VDC
- Micro USB connector for programming
- Digital I/O Pins: 12 (Of which 5 provide PWM output)
- Analog Input Pins: 4 (10-bit)
- Rx and Tx Hardware Serial Connections