Phil Schatzmann

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Arduino

Arduino

Remote Control for the Arduino AudioTools AudioPlayer

I thought it might be cool to provide a remote control for the AudioPlayer which is part of the Arduino Audio Tools. I did not want to invent a new protocol, so I implemented the HTML interface that has been documented by the KA-Radio project. I am providing a Stream Read more…

By pschatzmann, 3 weeks19. April 2025 ago
Arduino

A Http Live Streaming (HLS) Player with the Arduino Audio Tools

In traditional http streaming we can just read a single audio stream and feed it to a decoder. Unfortunatly Http Live Streaming (HLS) adds a lot of additional complexity and overhead. It works by splitting an audiostream into very short segments, which are just a few seconds in length, and Read more…

By pschatzmann, 1 month9. April 2025 ago
Arduino

SD Read and Write Speeds on an ESP32

I did not find any comprehensive overview of the expected read on write speeds of the different Arduino SD APIs that are provided to access the SD drive. I also expected to see a difference depending on the read/write size. I tested the SD and SDMMC libraries, that are provided Read more…

By pschatzmann, 2 months25. March 2025 ago
Arduino

AudioTools: An ESP32 IDF implementation of URLStream

The following classes can be used as HTTP client and implement the AbstractURLStream API. All these classes are dependent on the Arduino Networking API: URLStream: Supports HTTP GET, POST, PUT and DELETE ICYStream: Supports the ICY protocol URLStreamBuffered: Using buffer that is filled by a task ICYStreamBuffered: Using buffer that Read more…

By pschatzmann, 2 months4. March 2025 ago
Arduino

AudioTools: Using Multiple Decoders

In all my demo sketches so far, I have used just one decoder only, but what if we want to play multiple audio file types ? To support this scenario, I decided to provide the MultiDecoder class, that lets you register your codecs with the corresponding mime type. This class Read more…

By pschatzmann, 3 months26. February 2025 ago
Arduino

Using Inverse FFT to generate Audio

So far I was using the Fast Fourier Transform (FFT) functionality of my “Arduino Audio Tools Library” for analyzing the audio. This week I spent some time to make sure that we also support the inverse FFT properly. The inverse FFT is generating audio samples in the time domain from Read more…

By pschatzmann, 3 months21. February 2025 ago
Arduino

AudioTools: Filter Performance of the RP2350

When I was comparing the RP2040 with an ESP32 for audio filters quite some time ago , the ESP32 was winning by a big margin. The Rasperry Pico has been improved with the new RP2350 and I thought it would be interesting to have a comparision: I was using the Read more…

By pschatzmann, 3 months29. January 2025 ago
Arduino

arduino-audio-tools: Mixing Effects with the Input Signal

Yesterday, a user was proposing an Arduino Sketch for a Guitar Effects Pedal which is mixing the original input with an effect. Setting up a simple effect is easy, but I have never thought about how to mix the effect with the original input. He was proposing the following process Read more…

By pschatzmann, 4 months19. January 2025 ago
Arduino

arduino-snapclient with Rasperry Pico 2 W

I was wondering if the Raperry Pico 2W can be used with my Arduino Snapclient Library. A related discussion was hinting that it is just not powerful enough. In the beginning was stuggeling quite a bit and the audio with Opus was just not working and I could bareliy make Read more…

By pschatzmann, 4 months ago
Arduino

TinyUSB: the RP2040 I2S Output Challange

The starting point for writing audio data from USB to I2S using a Rasperry Pico (RP2040) Microcontroller is the speaker example sketch from my extended TinyUSB library. We would just do an i2s.write(data, len) in the callback: Unfortunately this did not work and this was locking up the output quite Read more…

By pschatzmann, 4 months9. January 2025 ago

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Phil Schatzmann
Rue du Biais 24 B
1957 Ardon
Switzerland

phil.schatzmann@gmail.com

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