Datasheet

The Analog/Digital GPIO Pins

Analog 0 - also known as Digital 14, this pin can be a digital I/O pin or an analog input pin

Analog 1 - also known as Digital 15, this pin can be a digital I/O pin or an analog input pin

Analog 2 - also known as Digital 16, this pin can be a digital I/O pin or an analog input pin

Analog 3 - also known as Digital 17, this pin can be a digital I/O pin or an analog input pin

Analog 4 - also known as Digital 18, this pin can be a digital I/O pin or an analog input pin. It's also the I2C SDA

Analog 5 - also known as Digital 19, this pin can be a digital I/O pin or an analog input pin. It's also the I2C SCL