• 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 Jul 24, 2024.

This page (Pinouts) was last updated on Mar 08, 2024.

Text editor powered by tinymce.