Analog 5 - also known as Digital 19, 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.

Analog 3 - also known as Digital 17, 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 1 - also known as Digital 15, this pin can be a digital I/O pin or an analog input pin.

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

Digital 12 - Also known as the SPI MISO pinDigital 13 - Also known as the SPI CLOCK pin.

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

Digital 11 - Also known as the SPI MOSI pin.

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 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 8 - Nothing particularly special about this GPIO pin.

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

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

Digital 4 - Nothing particularly special about this GPIO pin.Digital 3 - this pin can also be used as a PWM output pin using analogWrite().TX - also known as Digital #1, this is the hardware serial output pin.

RX - also known as Digital #0, this is the hardware serial input pin.

Programming adafruit trinket 5v