Playing audio files in a Pi Pico without a DAC

1. Pico-USB-audio

   1 1 199 - C++

   Sigma Delta Modulation for RP2040, ESP32, Teensy

   

   Using PWM to play audio is flawed (but usable for many applications), other approaches such a sigma-delta will lead to much better results, but with a lot more effort. https://github.com/tierneytim/Pico-USB-audio seems like a reasonable implementation at first glance.

2. SaaSHub

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   SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

   

3. mico

   2 1 208 - HTML

   Open Source PDM to USB microphone based on the Raspberry PI RP2040. (by mkvenkit)

   

   Agreed.

   While ΔΣ modulation, also known as pulse-density modulation, is not supported in "hardware" on Pi Pico, it is possible to do it in "software" with programmable IO, like in tierneytim's Pico-USB-audio project you're linking to.

   Also, PDM input could be done in similar fashion: https://github.com/mkvenkit/mico

4. driver-examples

   3 3 114 2.6 Rust

   Rust example programs for many of my hardware device drivers running on STM32F3 Discovery, STM32F103 "Blue Pill", RaspberryPi and micro:bit boards

   

   It was actually quite simple and a lot of fun to write (and hear!).

   Video: [1]

   Source code: [2]

   [1]: https://blog.eldruin.com/ad983x-waveform-generator-dds-drive...

   [2]: https://github.com/eldruin/driver-examples/blob/master/stm32...

5. pigweed

   4 3 533 9.9 C++

   Modern software development for embedded systems

   

   Yep, it's a Google project. We've also got a GitHub mirror: https://github.com/google/pigweed

6. ohmy

   5 1 - -

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