datasheetDescription:
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
