Professional version of the Arduino Mini Pro is a micro controller circuit board. It has 14 digital input/output pin (six of them can be used as a PWM output), 8 analog input, a 16 MHZ resonator, a reset button, the installation hole lead foot.
Pro mini ATMEGA328P
3.000 BHD
Pro Mini Module Atmega328P 3.3V 8Mhz 5V 16M For Arduino Nano Microcontrol Micro Control Board