ATMEGA328P 5V / 16M Board Module w/ PIN Header Connectors - Blue
20 digital input / output pin RX TX D2~D13 A0~A5; 8 analog input pin A0~A7; 1 pair TTL electrical level serial port pin: RX / TX; 6 PWM pin: D3 D5 D6 D9 D10 D11; Adopts Atmel Atmega328P-AU singlechip; Supports serial port download; Supports external 5V~12V DC power supply; supports 12V and lower battery power supply; Clock frequency: 16MHz