Datasheet

Each pad can provide up to ~20mA of current. Don't connect a motor or other high-power component directly to the

pins! Instead, use a transistor to power the DC motor on/off (https://adafru.it/aUD)

All of the GPIO pads are 3.3V output level, and should not be used with 5V inputs. In general, most 5V devices are OK

with 3.3V output though.

Other than A0, which is shared with the speaker, all of the pads are completely 'free' pins, they are not used by the

USB connection, LEDs, sensors, etc so you never have to worry about interfering with them when programming.

Each Pin!

Let's start with A0 which is in the bottom right corner, and work our way counter-clockwise

A0 (a.k.a D12) - This is a special pin that can do true analog output so it's great for playing audio clips. In can be

digital I/O, or analog I/O, but if you do that it will interfere with the built-in speaker. This is the one pin that cannot

be used for capacitive touch.

A1 / D6 - This pin can be digital I/O, or analog Input. This pin has PWM output and can be capacitive touch sensor

A2 / D9 - This pin can be digital I/O, or analog Input. This pin has PWM output and can be capacitive touch

sensor

A3 / D10 - This pin can be digital I/O, or analog Input. This pin has PWM output and can be capacitive touch

sensor

A4 / D3 - This pin can be digital I/O, or analog Input. This pin is also the I2C SCL pin, and can be capacitive touch

sensor

A5 / D2 - This pin can be digital I/O, or analog Input. This pin is also the I2C SDA pin, and can be capacitive touch

sensor

A6 / D0 - This pin can be digital I/O, or analog Input. This pin has PWM output, Serial Receive, and can be

capacitive touch sensor

A7 / D1 - This pin can be digital I/O, or analog Input. This pin has PWM output, Serial Transmit, and can be

capacitive touch sensor

Internally Used Pins!

These are the names of the pins that are used for built in sensors and such!

D4 - Left Button A

D5 - Right Button B

D7 - Slide Switch

D8 - Built-in 10 NeoPixels

D13 - Red LED

D27 - Accelerometer interrupt

D25 - IR Transmitter

D26 - IR Receiver

A0 - Speaker analog output

A8 - Light Sensor

A9 - Temperature Sensor

A10 - IR Proximity Sensor

D28 - Internal I2C SDA (access with Wire1)

D29 - Internal I2C SCL (access with Wire1)

D30 (PIN_SPI_MISO) - SPI FLASH MISO

D31 (PIN_SPI_SCK) - SPI FLASH SCK