1.12 digital input / output port D2 to D13
2.8 analog inputs A0 ~ A7
3.1 pairs TTL level serial transceiver port RX / TX
4.6 PWM port , D3 , D5, D6, D9 , D10 , D11
5. Atmel ATmega328P – AU MCU
6 USB download and power
7. Support the external 5V … 12V DC power supply
8. To support 9V battery powered
9 support ISP download
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