Datasheet

The Digital Only GPIO Pins

RX - also known as Digital #0, this is the hardware serial input pin. This is used when programming with an FTDI

cable but is available when using the native USB to program

TX - also known as Digital #1, this is the hardware serial output pin. This is used when programming with an FTDI

cable but is available when using the native USB to program

Digital 3 - Also known as external interrupt #1. This pin can also be used as a PWM output pin using

analogWrite()

Digital 4 - Nothing particularly special about this GPIO pin

Digital 5 - this pin can also be used as a PWM output pin using analogWrite()

Digital 6 - this pin can also be used as a PWM output pin using analogWrite()

Digital 8 - Nothing particularly special about this GPIO pin

Digital 9 - this pin can also be used as a PWM output pin using analogWrite() It's also good for driving servos

because its a high-speed PWM output

Digital 10 - this pin can also be used as a PWM output pin using analogWrite() It's also good for driving servos

because its a high-speed PWM output

Digital 11 - Also known as the SPI MOSI pin. this pin can also be used as a PWM output pin using analogWrite()

Digital 12 - Also known as the SPI MISO pin

Digital 13 - Also known as the SPI CLOCK pin. This is

also

connected to the red #13 LED!

Note that Digital 2 and Digital 7 are used for the dedicated USB bootloading setup and are not exposed/available!