Arduino
The Colours of Noise
Recently somebody asked me to provide some pink noise! I knew about white noise, but I did not know that noise can come in different colors. So this is the perfect opportunity to play around with noise.
Arduino
Using Mozzi with the AudioKit
Mozzi brings your Arduino to life by allowing it to produce much more complex and interesting growls, sweeps and chorusing atmospherics. These sounds can be quickly and easily constructed from familiar synthesis units like oscillators, delays, filters and envelopes. The AudioKit is a cheap ESP32 based audio board that usually Read more…
Arduino
Arduino AudioTools: Display the FFT Result on a LED Matrix
I have added a simple output class to my Arduino Audio Tools which can display the result of a FFT analysis on an LED Matrix. For my tests, I am using a 32 x 8 LED Matrix, but first we need to test the functionality. Determine the Wiring Logic I Read more…
Arduino
Supporting WM8960 Audio Boards in Arduino
The WM8960 based boards are quite popular as Audio Modules for the Rasperry Pi and I had one of these laying around. So I had it always on my to-do list to extend my AudioTools library to support this audio chip as well, so that it can be used in Read more…
Arduino
A simple Midi File Parser (not only) for Arduino
I was looking for a simple midi file parser library, but I did not find anything that made me happy, so I decided to provide one myself. Here are my design goals: minimal RAM requirements for midi with 1 track incremental writing and parsing of data No external dependencies: compile Read more…
Arduino
AudioTools and 24 bit values
I always planned to support audio with 24bit values in my Arduino Audio Tools library, but I never actually tested the functionality and so far I did not have a clear understanding of how these values would need to be represented. To be prepared I already provided a draft implementation Read more…
Arduino
Getting Started with the STM32F411 Discovery Kit and Arduino
I started to explore the STM32F411 Discovery Kit which comes with the following features: STM32F411VE Arm®(a)-based microcontroller featuring 512 Kbytes of Flash memoryand 128 Kbytes of RAM A (blue) user push-button ST MEMS 3-axis digital gyroscope (L3GD20 or I3G4250D) ST MEMS 3D digital linear accelerometer and magnetic sensor (LSM303DLHC or Read more…
Arduino
Analyzing ESP32 Exceptions
When your Arudino sketch is crashing it produces something as follows 13:45:41.992 -> 13:45:41.992 -> Backtrace: 0x40083585:0x3ffb2690 0x400892ad:0x3ffb26b0 0x4008e2f1:0x3ffb26d0 0x400d1442:0x3ffb2800 0x400d2be1:0x3ffb2820 13:45:41.992 -> 13:45:41.992 -> 13:45:41.992 -> 13:45:41.992 -> 13:45:41.992 -> ELF file SHA256: 9868280367130d7a It is vital to be able to analyse this backtrace and translate it to methods Read more…
Arduino
Arduino AudioTools – Audio Effects
I was never quite happy with my old implementation of the AudioEffects class because it was not very intuitive with the required type parameters and I thought it is about time to improve. So I finally managed to provide a proper Stream implementation that works like many other converting Streams, Read more…
Arduino
Arduino Audio Tools – Resampling Revisited
So far I have provided some resampling functionality that was working with some integer factors to up- and downsample. After the work on the Pitch Shifting I realized that we can easily resample using a float based step size to achieve any resampling factor and determine the new values with Read more…