Ciro Santilli @cirosantilli  40

Contains instructions on how to synthesize MIDI.

Extension: sf2.

Can be imported for example by:

Opens a virtual MIDI piano GUI. It just works on Ubuntu 20.04: askubuntu.com/questions/34391/virtual-midi-piano-keyboard-setup/1298026#1298026

VMPK is a virtual device that replicates what you would get by connecting a physical MIDI keyboard to your computer. It is not a software synthesizer on its own. But it does connect to a working synthesizer by default (Sonivox EAS) which makes it produce sounds out-of-the box.

TODO: then I messed with my sound settings, and then it stopped working by default on the default "MIDI Connection" > "MIDI Out Driver" > "Network". But it still works on "SonivoxEAS".

A hello world of actually connecting it to a specific software synthesizer manually on Advanced Linux Sound Architecture with aconnect can be found at: askubuntu.com/questions/34391/virtual-midi-piano-keyboard-setup/1298026#1298026

Save to a MIDI file: askubuntu.com/questions/709673/save-as-midi-when-playing-from-vmpk-qsynth/1298231#1298231

Reasonable default key mappings to keyboard covering 2 octaves.

3 multiple simultaneous keys did not work (tested "ZQI"). This might just be a limitation of my keyboard however.

TODO how to save to a .mid file? askubuntu.com/questions/709673/save-as-midi-when-playing-from-vmpk-qsynth

SourceForge.

Bluetooth support: not enough RAM for it, though in principle its chip/transceiver could support it! microbit-micropython.readthedocs.io/en/v1.0.1/ble.html

Supported editors: microbit.org/code/

MicroPython web editor and compiler: python.microbit.org/v/2

Everything in this section is tested on the Micro Bit v1 from Micro Bit v1 unless otherwise noted.

Bibliography:

In the 2010's/2020's, many people got excited about getting children in to electronics with cheap devboards, notably with Raspberry Pi and Arduino.

While there is some potential in that, Ciro Santilli always felt that this is very difficult to do, while also keeping his sacred principle of backward design in mind.

The reason for this is that "everyone" already has much more powerful computers at hand: their laptops/desktops and even mobile phones as of the 2020s. Except perhaps if you are thing specifically about poor countries.

Therefore, the advantage using such devboards for doing something that could useful must come from either:

Many devborads require a 5V power supply.

This is common on wall transformers and USB, but not in batteries.

For battery power you need a transformer.

Study of the metabolome.

For a commented initial example, see: e. Coli K-12 MG1655 gene thrA.

KEGG does the visual maps well.

But BioCyc is generally better otherwise.

Present at: www.roche.com/about/philanthropy/science-education/biochemical-pathways/

TODO human presumably?

I don't think it has any advantage over KEGG however, besides historical interest? Maybe slightly more manual layout and so more beautiful?

James Somers (rightly) likes to point to it as a "biology is awesome" thing.

An artificial metabolic pathway using synthetic biology technology.

Design software for synthetic biological circuit.

The input is in Verilog! Overkill?

Then it essentially maps to a standard cell library of biological primitives!

OK, you have to share your phone with the company to prevent spam which forces us into messaging software that force you to have a mobile phone, but why do you also have to share your phone with contacts? So you are then forced to give your phone number away on the Internet.

It appears that Maxwell's equations can be derived directly from Coulomb's law + special relativity:This idea is suggested by the charged particle moving at the same speed of electrons thought experiment, which indicates that magnetism is just a consenquence of special relativity.

This is a well known though experiment, which Richard Feynman used to emphasize

In the above experiment:

The solution to this problem is length contraction: the positive charges are length contracted and the moving electrons aren't, and therefore they are denser and therefore there is an effective charge from that frame.

This is also mentioned at David Tong www.damtp.cam.ac.uk/user/tong/em/el4.pdf (archive) "David Tong: Lectures on Electromagnetism - 5. Electromagnetism and Relativity" "5.2.1 Magnetism and Relativity".