网址：
https://github.com/sparkfun/Pro_Micro
/Documentation - Data sheets (.pdf and .svg)
/Firmware - Arduino example code used in the hookup guide
/Hardware - All Eagle design files (.brd, .sch, .STL)
/Production - Test bed files and production panel files
DEV-12587- 3.3V/8MHz version
DEV-12640- 5V/16MHz version
ATMega 32U4 running at 3.3V/8MHz
Supported under Arduino IDE v1.0.1
On-Board micro-USB connector for programming
9 x 10-bit ADC pins
12 x Digital I/Os (5 are PWM capable)
Rx and Tx Hardware Serial Connections
Our Smallest Arduino-Compatible Board Yet!
1.3x0.7”
https://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/ProMicro8MHzv1.pdf