Using a low power 5V fan on a relay toggled by a Pi Pico to see how much a sheet of copper suspended in its vicinity will be moved. The effect is subtle, perhaps the elongation is 5-10 mm. The fan is quite silent; one could point it more directly at the sheet.

Project to implement a 'padded' version of the Wolkenpumpe live improvisation software interface. NuagesPad is inspired by the idea of Etherpad to assemble multiple players within one virtual space, giving each their own view / perspective.

See also https://www.researchcatalogue.net/view/426429/1114309/1720/600

Transmitting a message from one Pi Zero to another via speaker and microphone, and frequency-keyed modulation based on biphase-mark scheme.

Process of creating a sound installation with autonomous nodes composed of a Pi zero / single speaker channel / one microphone channel. Obtaining spatial identification from repeated impulse response measurements, and translating a set of distances to frequencies (timbre).

Next FScape version 3.14 / Mellite 3.13 will contain new feedback UGens. Here is a test with the feedback loop consisting of a Hilbert transform based frequency shifter and a delay, the shift moving the signal down 30 Hz in each iteration. There is an anti-aliasing high pass filter as well. The input signal is just 10 seconds of microphone signal initially picked up, my voice making some screeching sounds. As the process evolves, some interesting changes in timbre occur, notably some extreme energies are coming down from Nyquist, perhaps due to some ringing or other artefacts. The video has a gap in the middle because the computer would freeze (I suspect it was some problem of the screen recorder). The code is quite experimental, as one has to take care to enable sufficient buffering so that the DSP graph is flowing uninterruptedly.

I quickly hacked together a 2D graphics layer for my functional-reactive / dataflow model 'Lucre', with a Processing inspired front API, which allowed me to translate the 'Tree' L-System sketch by Daniel Shiffman. While running smoothly on a laptop, the test on a Pi 4B immediately reveals that my library has hardly usable performance at this stage. First part of the video shows the few-frames-per-second of Lucre2D, followed by the totally smooth animation coming from Processing 3.

After giving up on the Pi 4, another attempt with the capsense library of CircuitPython on a Pi Pico. The resistor has a few mega ohms; with the correct threshold (which changes according to environment ...) one gets quite a good reading.

I'm starting to explore the visuality of small 2" round screens covered with a half-dome plano-convex glass lens. Despite low FPS (Pi 4B, code not performance optimised), the animation of moons along a Steiner Chain of size 3 is interesting.

Second attempt - success! This is now with stronger servos (Jamara Q7 Standard - c. 6 kg force), and minimising sideways force by adding a small wood strip to the trigger. It's a bit messy, so I'll add some plastic sheets to the floor, especially when adding Spirulina to the lichen formula and automatically running the irrigation twice a day 😃

Following a video I saw on YT about activating a spray bottle with servo motors, I tried to recreate a similar setup. It "kind of" works, but the servos do not perform the full required angle. My guess is, they are simply to weak and thus stop at the point where their force is exhausted. They are super cheap SG90.

Any ideas how to make it work? Should I find another bottle with a less strong spring? Should I get better servos? I'm using a PCA9685 board to create the PWM signals, so I'm a bit worried that I have to stick to the 50 Hz / 1-2ms analog servos, whereas the strong servos are usually digital with other frequency range. Hints welcome!