Holdding Improved Version of Pro Mini Atmega328 5V 16MHz for Arduino IDE with 1 ISP Pin Microcontroller: Atmel Atmega328P-AU Operating Voltage (logic level): 5 V Digital I/O Pins :14 (of which 6 provide PWM output) (RXTXD2~D13) PWM output: 6 PWM (D3, D5, D6, D9, D10, D11) Analog Input Pins: 8 DC (A0~A7)