A simple audio player for SAMD21G-based microcontroller boards #Music @MicrochipMakes

Oscar den Uijl has created a simple (but oversampling) audio player for SAMD21G-based Arduinos.

Basically, this library lets you send an array of 8-bit samples to the DAC on pin A0, with optional extrapolation aka oversampling.

I have connected the output pin through a 2.2μF capacitor and a 1kΩ resistor in series to a small and cheap active speaker set like you would use for a computer. It also seems to work fine when I connect it to the AUX input of the sound thingy on my computer.


  • Plays 8-bit samples in mono only. Extrapolation aka oversampling can be used to improve the output.

  • Uses GCLK3 and TC4, affects TC5.

  • The values of the capacitor and resistor I use have not been calculated; they just happened to be the ones lying around within reach and their values seemed close enough for this.

  • Sound quality may improve a bit if you add a low-pass filter to get rid of the “steps” in the output. Extrapolation does make them smaller, but they are still there.

  • If you have an Arduino 33 IoT, playing the sound with the example will start when you tap your breadboard, or hit your table (Tilt!). Other Arduinos will just loop the sample with a short pause in-between (I hope).

  • The example will load very slowly in the Arduino IDE, because there is a large sample array in it, and the Arduino IDE isn’t very good at loading large programs quickly.

  • Only tested on the Arduino Nano 33 IoT, and this is an early version; YMMV.

See more on GitHub.

Adafruit publishes a wide range of writing and video content, including interviews and reporting on the maker market and the wider technology world. Our standards page is intended as a guide to best practices that Adafruit uses, as well as an outline of the ethical standards Adafruit aspires to. While Adafruit is not an independent journalistic institution, Adafruit strives to be a fair, informative, and positive voice within the community – check it out here: adafruit.com/editorialstandards

Join Adafruit on Mastodon

Adafruit is on Mastodon, join in! adafruit.com/mastodon

Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Join over 36,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

CircuitPython – The easiest way to program microcontrollers – CircuitPython.org

Maker Business — “Packaging” chips in the US

Wearables — Enclosures help fight body humidity in costumes

Electronics — Transformers: More than meets the eye!

Python for Microcontrollers — Python on Microcontrollers Newsletter: Silicon Labs introduces CircuitPython support, and more! #CircuitPython #Python #micropython @ThePSF @Raspberry_Pi

Adafruit IoT Monthly — Guardian Robot, Weather-wise Umbrella Stand, and more!

Microsoft MakeCode — MakeCode Thank You!

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — #NewProds 7/19/23 Feat. Adafruit Matrix Portal S3 CircuitPython Powered Internet Display!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !

No Comments

No comments yet.

Sorry, the comment form is closed at this time.