Edrumulus News

[corrados]

Real-time visual feedback using the Arduino IDE plotter

In the most recent Git code I have introduced a new feature which makes it possible to view the captured signal trace and some detection algorithm parameters in real-time while playing. Here is a short video of how it works:

The blue trace is the raw input signal, the red trace is the band-pass filtered signal, the green trace is the estimated signal decay function (used for retrigger cancellation) and the orange line is the detection threshold which is applied to the filtered signal.

Edit: If the green line is at 0 dB, the algorithm is in idle state. If it is just below 0 dB, it marks the scan time. If it is a little bit lower than this value, it marks the mask time.

[corrados]

Linux command line GUI

There is a new tool available to show/modify Edrumulus parameters in a Linux (remote) shell using the ncurses library. This comes handy if Edrumulus is used with Drumgizmo running on a headless Raspberry Pi.

[corrados]

If you are using an Edrumulus device with USB MIDI support (like the Teensy), you can use the new edrumulus_gui.py also on Windows:

by installing python-rtmidi and windows-curses and running:
python edrumulus_gui.py rtmidi

[corrados]

I just found out that it possible to use edrumulus_gui.py even with a ESP32:

The edrumulus_gui.py must be slightly adjusted and Hairless MIDI and loopMIDI must be configured as in the screen shot.

[corrados]

Edrumulus prototype 5 with Raspberry Pi 4

A new Edrumulus hardware based on prototype 5 PCB is ready:

The base is a Raspberry Pi 4 with 8 GB RAM which has a aluminum case. On top of that the Edrumulus hat and a LCD/button hat are stacked.

Since the Raspberry Pi 4 is very powerful, it should be possible to use all microphone channels of the Drumgizmo drum kits and mix the sound on the fly with tools like ecasound.