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Support power supply by external 3.3V~12V DC power and 9V battery power.

Main Chip: Atmega328P-AU

14 digital input / output port: RX, TX, D2 D13

8 analog input ports: A0 ~ A7

1 pair TTL level serial transceiver port: RX / TX

6 PWM ports: D3, D5, D6, D9, D10, D11

Clock frequency: 16MHz

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