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Microcontroller: ATmega328
Circuit Operating Voltage: 3.3V
Clock frequency: 8MHz.
Digital I/O Pins: 14
8 analog input port: A0 ~ A7.
A pair of TTL level serial port transceiver : RX / TX.
6 PWM port: D3, D5, D6, D9, D10, D11.
Support serial download.