Microcontroller: ATmega32U4 Operating Voltage: 3.3V or 5V (depending on model) Input Voltage: 5 - 12 V (5V model) Digital I/O Pins: 20 (of which 7 provide PWM output) Analog Input Pins: 12 Flash Memory: 32 kB SRAM: 2.5 kB EEPROM: 1 kB Clock Speed: 8 MHz (3.3V model) or 16 MHz (5V model)
This tiny little board does all of the neat-o Arduino tricks that you’re familiar with: 4 channels of 10-bit ADC, 5 PWM pins, 12 DIOs as well as hardware serial connections Rx and Tx. Running at 16MHz and 5V, this board will remind you a lot of your other favorite Arduino-compatible boards but this little guy can go just about anywhere. There is a voltage regulator on board so it can accept voltage up to 12VDC.
There is a PTC fuse and diode protection to the power circuit and corrected the RX and TX LED circuit.
Driver: https://www.cdn.sparkfun.com/assets/learn_tutorials/1/2/1/SH32U4_driver.zip Windows Driver Installation: https://www.learn.sparkfun.com/tutorials/pro-micro--fio-v3-hookup-guide/installing-windows Linux / Mac Driver Installation: https://www.learn.sparkfun.com/tutorials/pro-micro--fio-v3-hookup-guide/installing-mac--linux