A Simple Arduino Bluetooth Music Receiver Library for the ESP32

The ESP32 provides a Bluetooth A2DP API that receives sound data e.g. from your Mobile Phone and makes it available via a callback method. The output is a PCM data stream decoded from SBC format. The documentation can be found here.  I2S is an electrical serial bus interface standard used for connecting digital audio devices together. It is used to communicate PCM audio data between integrated circuits in an electronic device. So we can just Read more

By pschatzmann, ago

Music from a Raspberry Pi over I2S

The simplest way to stream music from a Raspberry PI to an external amplifier is to connect the headphone jack to the AUX Input of the amplifier with the help of a corresponding connector cable. From a quality point of view a better approach is to use an external Digital to Analog Converter (DAC)  connected to the I2S pins of the Raspberry PI and for a PI Zero this is the only way because it Read more

By pschatzmann, ago

Music from a ESP32 Microcontroller

When I moved to my new place in the beautiful canton of Valais – I did not re-activate my old Turntable and Amplifier and just left them in a corner. Today I decided to reactivate my devices again but to my disappointment I could hear only some scratching sounds form my loudspeakers when I turned the different controls. I took my Technics SU-Z2 amplifier apart, cleaned it from the dust and applied plenty of Contact Read more

By pschatzmann, ago

OpenSCAD Libraries and Change Management in the Jupyter Kernel

Im my last Blog I was using some functionality from https://dkprojects.net/openscad-threads/ in order to define a nut and a bolt. I was finding this library with the help of Google. Like with any software language, it does not make sense if you try to re-invent the wheel (though some key stakeholders of the project actually think that everybody should write their’s own library). In any case it is worth to check out if some components Read more

By pschatzmann, ago

The Cheapest Camera for Octoprint

I bought myself a cheap Ender3 3D Printer. As my first project I decided to connect it to Octoprint. Because I did not want to use any of my Raspberry PIs and I had a spare old FitPC2 Linux machine, I thought it was time to reactivate it for a new purspose. I am using this solution successfully for quite some time now, so I wanted to take it to the next level by adding Read more

By pschatzmann, ago

Syntax Hightlighting for OpenSCAD in Jupyterlab

Out of the box Jupyterlab is providing a rich set of supported languages for Syntax Highlighting. Unfortunately OpenSCAD is not one of them. So I tried to research this topic: Internally Jupyterlab is using the CodeMirror editor and Codemirror allows to extend the syntax highlighting by defining custom modes. The easiest way is to use a Simple Mode. Jupyterlab as well supports the functionality of Extensions. So the challenge is to provide a Jupyterlab Extension Read more

By pschatzmann, ago