• 5.0V - Connected to power on the audio amp
  • 3.3V - Connected to the STEMMA QT / Qwiic connector
  • GND - Ground for everything


  • GPIO #18, GPIO#19, GPIO #20, GPIO #21 - I2S Digital Audio.
  • Speakers - The two speaker connectors are located on the bottom in the middle, labeled Right and Left. Plug in an enclosed speaker or  use a JST 2PH cable to attach custom speakers.
  • Microphones - The two mics are in the middle of each side, labeled L Mic and R Mic.
  • Headphones/Line Out - 3.5mm headphone jack located on the bottom right. Use any headphones or Line-Out to another audio system.
  • On/Off Switch - Located towards the left in the middle of the board, switches audio on and off.


This pin has a 10K pullup to 3.3V so when the button is pressed, you will read a LOW voltage on this pin.

  • GPIO#17 - Button

STEMMA QT Connector

DotStar LEDs

Three fully color RGB addressable LEDs can provide feedback or a light show. Uses DotStar protocol (not NeoPixel) so any microcomputer can easily control the lights.

  • GPIO #5 - DotStar LED data pin.
  • GPIO #6 - Dotstar LED clock pin.

Digital/Analog Connector

GPIO#12 - 3-pin JST digital or analog connector. Easily connect things like NeoPixels or servos using this 2mm connector. You can also use a generic JST cable to connect to a breadboard.

This guide was first published on Oct 28, 2020. It was last updated on Oct 28, 2020.

This page (Pinouts) was last updated on Jan 25, 2021.