#circuitpython — Public Fediverse posts

Another weird day of DIY between meetings and frontend prototypes at work.

If a colleage asks you if they can build a DIY keyboard-shortcut-buttonbox-for-powerpoint-ui-papercuts you should always agree do it. The large 30mm arcade buttons are a great touch.

The Adafruit Kee Boar is a super fun board. I'd argue #circuitPython is a little too easy. I was able to get the button input as HID device with the documentation in minutes.

#diy

I was on the #teachingpython podcast! I got to talk with Kelly and Julian about Python, #CircuitPython, UF2 bootloader troubles, and #embedded systems in general. It was a lot of fun. https://www.teachingpython.fm/156

#CircuitPython 10.3.0-alpha.2 released!
https://blog.adafruit.com/2026/05/15/circuitpython-10-3-0-alpha-2-released/
Highlights:
- Fix crashes on certain boards with integral displays.
- Adafruit MagTag 2025: improve display quality and support new display variant.
- Add CIRCUITPY_SDCARD_USB to settings.toml to control visibility of a mounted SD card on USB.
- Support float values in settings.toml.
- Report USB MSC drives as removable media to the host.
- Update ESP-IDF to v6.0.1.
- Fix audiomixer.Mixer on SAMx5x.
- STM: audio.AudioOut, using DAC.

#CircuitPython 10.2.1 released!

https://blog.adafruit.com/2026/05/12/circuitpython-10-2-1-released/

Highlights:
- Fix crashes on certain boards with integral displays.
- Adafruit MagTag 2025: improve display quality and support new display variant.

Someone asked how play multiple simultaneous CD-quality WAVs from an SD card to I2S DAC on ESP32 in CircuitPython. Turns out: possible! Can get a bit glitchy if doing USB stuff tho https://www.youtube.com/watch?v=97OA6L9PLCg
code: https://github.com/todbot/circuitpython-tricks/blob/main/larger-tricks/wavmix_s2mini_i2s_sd.py
#CircuitPython #i2s #esp32

Pico Touch Board Audio

I wanted to go back to my Pico Touch Board PCB Design and see if there was a way to make it more stand-alone. The original design was to make it a MIDI controller, but that isn’t the only option.

https://makertube.net/w/tADSyrPrUdR1mx7yKRXZTC

Warning! I strongly recommend using old or second hand equipment for your experiments.  I am not responsible for any damage to expensive instruments!

These are the key Arduino tutorials for the main concepts used in this project:

• Pico Touch Board PCB Design
• Arduino PWM Output Filter Circuit

If you are new to microcontrollers, see the Getting Started pages.

Parts list

• Pico Touch Board PCB – built
• Resistors: 1x 220Ω, 1x 1K
• Capacitor: 1x 100nF ceramic, 1x 22uF electrolytic
• Breadboard and jumper wires

The Circuit

Most of the GPIO are linked out to the touch pads, but the three analog inputs are still available. They are added on to the header on the right hand side of the board at the top, so we can use one of these as an audio output.

Initially, I thought of connecting it to an 8Ω speaker. If I was using an Arduino then I’d use a 220Ω resistor in series to limit the current to less than 20mA. But as I’m using a Pico, the maximum current has to be a lot less. I seem to recall it is a little complicated, and there are some options, but I have a figure of around 4mA that I tend to work to. It is also running at 3.3V, which means that it would need an in series resistor of 3.3 / 0.004 = 825Ω. This would work, but the speaker will be really quiet!

So I ditched that idea (there is a software reason too, but I’ll talk about that in a moment) and went straight to a PWM output with a low-pass filter to try to give me some vaguely useful as a line-out signal.

I’ve not done the calculations, but instead went a bit “hand-wavy”, combing a 1K and 220Ω resistor to drop the voltage, along with a 100nF capacitor. I’ve also added a 22uF capacitor to remove the DC bias.

That seems to give me something useful, but as you can see from the trace below of a square wave PWM output, there is a lot of room for improvement!

Update

Ok, so going back and doing this semi-properly as per my notes from Arduino PWM Output Filter Circuit, I can see that the 1K and 220Ω resistors can be treated as a 180Ω equivalent (take them as two in parallel) for the filter circuit, which means a cut-off of around 8kHz which ought to be pretty good….

But reducing a 3V3 signal to around 20% leaves for quite a low level of audio – around 660mV peak to peak. It would probably be better to aim for a reduction of around a half.

Using a 1K and 500Ω resistor would be an equivalent resistance of 333Ω, so putting that into a low pass filter calculator gives a cut-off frequency of around 5kHz for a 100nF capacitor.

Weirdly the only thing that really seems to improve things is to raise that capacitor value to 1uF. My calculation would suggest a cut-off frequency of around 480Hz which is pretty small for an audio signal. But it seems to work.

The PWM frequency I was seeing was coming in at around 120kHz so should be plenty high enough to get filtered out. In the Circuitpython code, it is apparently chosen to support the number of bits required at the base clock frequency whilst being inaudible. For the RP2040 running at 125MHz, and with the chosen 10 bit resolution (more here) this is:

• 125,000,000 / 1024 = 122,070 Hz

A 5kHz (or even 8kHz) cut-off I thought ought to be fine, but Davide Bucci on Mastodon explained for me:

“120kHz is 25 times 4.7kHz, that is about 1.4 decades and with a first-order filter you have a tad less than 30dB of attenuation, that is not a lot. A signal at 3.3V peak to peak at 120kHz becomes about 100 mV on the output after the filter.”

So switching to 1uF, as Davide explains: “if you put 1µF, you are indeed filtering a decade lower, therefore you gain 20dB in the attenuation and the 100mV become 10mV, much less noticeable.”

The alternative is to repeat the 1K+100nF stage and add a second order filter which also seems to work pretty well.

The final circuit that works fine for me at present, will be on of the following.

The first is less components but assumes that the frequencies won’t go much about ~1KHz or so. That is ok for my current setup but would limit the audio range a fair bit.

This is the output of the two-stage filter. It is so much better!

The Code

I wanted to stick with Circuitpython, so my initial thought was to use simpleio.tone() to generate a tone based on a frequency from an IO pin. However, this has the problem that the code is blocking whilst the tone is playing which isn’t very useful.

Instead I went straight to synthio. It turns out that using synthio was actually a lot easier than the “simple” simpleio…

Here is the basic code to generate an ASR-shaped square wave on a PWM audio output on GPIO 28 based on the touch pads as input.

import board
import touchio
import synthio
import audiopwmio
from adafruit_debouncer import Debouncer, Button

audio = audiopwmio.PWMAudioOut(board.GP28)
synth = synthio.Synthesizer(sample_rate=22050)
audio.play(synth)
synth.envelope = synthio.Envelope(attack_time=0.1, release_time=0.6, sustain_level=1.0)

touchpins = [
    board.GP2, board.GP3, board.GP4, board.GP5,
    board.GP6, board.GP7, board.GP8, board.GP9,
    board.GP10, board.GP11, board.GP12, board.GP13,
    board.GP14, board.GP15, board.GP16, board.GP17,
    board.GP18, board.GP19, board.GP20, board.GP21, board.GP22
]

THRESHOLD = 1000
touchpads = []
for pin in touchpins:
    t = touchio.TouchIn(pin)
    t.threshold = t.raw_value + THRESHOLD
    touchpads.append(Button(t, value_when_pressed=True))

while True:
    for i in range (len(touchpads)):
        t = touchpads[i]
        t.update()
        
        if t.rose:
            synth.press(60+i)

        if t.fell:
            synth.release(60+i)

I did experiment with overclocking the Pico to give double the PWM frequency, using

microcontroller.cpu.frequency = 250_000_000

But although this did double the PWM frequency to around 244kHz, it didn’t seem to make much difference for the filtered signal.

Battery Power

One last thing I wanted to explore was if it was possible to power the touchboard with batteries. I left in a number of power options, so for this one I’m using the 5V/GND pin header. I’ve included a couple of capacitors for smoothing, and need to add the 1N5817 diode as shown below.

This requires the following additional components:

• 1x 1N5817 Schottky diode.
• 1x 100nF ceramic capacitor.
• 1x 47uF electrolytic capacitor.
• Jumper wires.
• 3 or 4 battery box.

The 5V/GND header pins connect to the Raspberry Pi Pico’s VSYS pin via the Schottky diode. The 1N5817 has a typical voltage drop of 0.45V, so combined with the Raspberry Pi’s accepted input voltage of 1.8V to 5.5V this means that ideally two or three AA batteries (at 1.5V each) would work. Four 1.2V rechargeables might be an option too.

It might be possible to get away with four 1.5V AAs, but that would give an input voltage of just over 5.5V, so I think that is probably pushing things too far. It might be a good use for some spent AAs though that are no longer reading a full 1.5V…

One of the downsides of battery power is that the touch works best when your fingers are at the same GND potential as the board. It works best if the GND pin of the (unpopulated) barrel jack is touched when using the board.

Closing Thoughts

With hindsight it would have been useful to have included a simple PWM output stage on the original board, but it is relatively straight forward to add one.

It might even be worth me making an add-on board that will connect to the header pins of the power and analog pins containing the simple passive filter components.

What is pretty impressive though, is how easy it is to use synthio with Circuitpython.

Kevin

#circuitpython #pwm #raspberryPiPico #synthio #touch

Last night was #robot arm class in Physical Computing & the #MakerSpace was electric with #CircuitPython #RaspberryPiPico #3dprinting arms battling to pick up candy! Learn such badassery at YouTube.com/@BuildWithProfG

"Ghost Catch", an accessibility game I'm prototyping for the Campus School at Boston College, which allows children with severe motor restrictions to pass an animation back and forth. https://youtu.be/98N8J6Ri4L4 GitHub repo in description. #CircuitPython #MakerSpace #TechForGood #Accessibility #CSed

Such a nice profile of the #AssistiveTech work being done by my Boston College Physical Computing students. https://www.bc.edu/content/bc-web/sites/bc-news/articles/2026/spring/the-class-that-makes-a-difference-.html May be interesting to folks in the #CSed #MakerSpace #RaspberryPi and #CircuitPython communities.

90 min newbie intro to #CircuitPython #raspberrypipico workshop. Lights, sound, potentiometer, and servo! Slides I use with parts & code for all #csed & #makerspace educators can be found at https://bit.ly/pico-workshop If you want to see a student demo video see: https://bsky.app/profile/gallaugher.bsky.social/post/3mhnmurcaqk2f

Diplo on your Pico! Build a polyphonic multi-sound DJ board on a sheet of paper using CircuitPython and a RaspberryPi Pico! https://bit.ly/pico-dj-board a super fun classroom build for the #CSed fam. @adafruit Adalogger Cowbell allows gigabytes of sound from the @raspberrypi Pico #circuitpython #raspberrypi #RaspberryPiPico #dj

Fun lesson - Build a @raspberrypi.com pico DJ board while learning to use the @adafruit.com $8 Adalogger Cowbell to expand file storage to 32GB, & add a STEMMA-QT port with no wiring! My students built this in the MakerSpace last class & it was a blast! https://youtu.be/yZdR7oGbTX8?si=HQveNpNpnvKJrTJK #CircuitPython #CSEd

#MakerSpace, #makered, STEMed and #csed folks, here's a super-fun challenge lesson I use in class: Build a Baby Groot who talks when his plant is touched. Uses #Adafruit #CircuitPython a Circuit Playground, a 3D printed planter, laser-cut box, but lots of options abound. https://youtu.be/gEmyZ7ZWMIo

Some of my @bostoncollege.bsky.social Physical Computing students delivering their #CircuitPython based assistive tech projects to their clients in the BC Campus School. I’m so lucky to work with such wonderful young people. https://www.instagram.com/p/DTljI53jW9h/?img_index=9&igsh=MWFkZ21xdDB2c215Yg== #csed #assistivetech

New #CircuitPython School lesson introduces key concepts: variable naming conventions, print & input for maker / electronics debugging, & AI code completion in PyCharm w/helpful & incorrect results. Also: Using AI for CircuitPython code explanations w/prompting examples. https://youtu.be/-wIqy7drCN8 #CSed

Good luck #CSed faculty prepping for next semester. Show me your maker closets! Here's the cart with many (although not all) of the parts I use for PhysicalComputing: Art, Robotics, and Tech for Good - the #CircuitPython course I teach accessible from new-to-code through advanced CS students.

Here's a link to today's CircuitPython exam: https://docs.google.com/presentation/d/1BeWUK_b5BKbo_GEi4BZVstnwV_1LJY5QNgVuA7ZbpdE/mobilepresent?slide=id.p
Students had to complete 8 builds in 2.5 hrs. Themes: "Magic-8 Ball Yoda", "Diwali Musical Chairs", An anti-cat distance-activated Turkey, & "Yip Yip Yip" martians from Sesame Street. Solution folder in the open course Google Drive at Gallaugher.com. #csed #maker #circuitpython

Use the buzzer to have your MCU play small wake-up melodies, signals, or music to accompany LED animations
https://www.makerspace-online.com/buzzer-music-simple-melodies-with-the-pi-pico/?utm_source=mms
#PiPico #buzzer #sound #MCU #OpenHardware #projects #code #programming #Arduino #CircuitPython

Trouble remembering to take your meds? Build this reminder box with <$20 in parts to light up when it's prescription time. I leave mine by my coffee maker so I never forget it. Updated lesson for classroom build https://youtu.be/imafYENxZ_U #TechForGood #CircuitPython #MakerSpace #AssistiveTech #raspberrypipico

ACEBOTT QD023 ESP32-based gesture control glove tracks finger movements with potentiometers

https://web.brid.gy/r/https://www.cnx-software.com/2026/01/26/acebott-qd023-esp32-based-gesture-control-glove-tracks-finger-movements-with-potentiometers/

Forbidden Planet “Krell” Display – MIDI CC Controller – Part 2

This revisits my Forbidden Planet “Krell” Display – MIDI CC Controller using my Forbidden Planet “Krell” Display PCB with a Waveshare RP2040 to create more of a “all in one” device.

Warning! I strongly recommend using old or second hand equipment for your experiments.  I am not responsible for any damage to expensive instruments!

If you are new to Arduino, see the Getting Started pages.

Parts list

• Updated Forbidden Planet “Krell” Display (see below).
• Completed Forbidden Planet “Krell” Display PCB Build
• Waveshare Zero format device (I’m using an RP2040)
• 4x 6mm brass spacers
• 4x 20mm nylon spacers

PCB

This requires a built of the Forbidden Planet “Krell” Display PCB with the following:

• 2 potentiometers
• MIDI IN and OUT

I’ve used potentiometers that are their own knob, as they only poke through the casing by around 5mm or so.

If it you are able to get longer shaft pots, then that would probably be worthwhile.

Updated 3D Printed Case

This requires the following from the Krell Display 3D Printed Case:

• 1x Frame
• 2x Inserts (with potentiometer holes)
• 1x EuroRack support

This requires the following options in the OpenSCAD code:

show_frame = 1;
show_quadframe = 0;
show_insert = 1;
show_support = 0;
show_quadsupport = 0;
show_eurorack = 0;
show_eurorack_support = 1;

alg_pot1 = 1;
alg_pot2 = 1;
alg_cv   = 0;

The frame does not really take into account the PCB at present, but I’ve reached the “good enough I want to do something else” stage, so I’ve just added a couple of small cut-outs (using a hacksaw) for the two MIDI sockets, and am content that the components stick out a bit from the back.

This cutout has to be 10.5mm from the end, 6mm wide, and 5mm deep.

At some point I might go back and design a deeper frame that has the cut-outs included and some kind of snap-on back to make it a self-contained box.

But for now, this is left as an exercise for, well, anyone else 🙂

Construction

I’ve used four brass 6mm spacers to screw into the mounting holes in the frame. Then the PCB can be inserted, taking care to squeeze in the 3D printed support around the LEDs and pots, and fixed with 20mm spacers which will also act as “legs”.

The Code

I’ve used a Waveshare Zero RP2040 and Circuitpython for this build. This is a combination of some of the test code used for the Forbidden Planet “Krell” Display PCB but with added MIDI.

The code supports both Serial and USB MIDI.

I wanted an equivalent of the Arduino map() and constrain() functions and didn’t immediate spot them in Circuitpython so wrote my own:

def algmap(val, minin, maxin, minout, maxout):
    if (val < minin):
        val = minin
    if (val > maxin):
        val = maxin
    return minout + (((val - minin) * (maxout - minout)) / (maxin - minin))

This allows me to map the analog read values (0 to 65535) down to MIDI CC values (0 to 127) whilst also allowing for some inaccuracies (I’ve treated anything below 256 as zero for example):

alg1cc = int(algmap(alg1_in.value,256,65530,0,127))

I’ve used the Adafruit MIDI library, which I’m still not really a fan of, but I wanted to include MIDI THRU functionality to allow the controller to sit inline with an existing MIDI stream. But it doesn’t seem to work very well.

I was already only updating the LEDs/MIDI CC if the pot values had changed, to cut down on the number of Neopixel writes required.

I experimented with changing the scheduling of the analog reads and MIDI but that didn’t seem to help very much. In the end I made sure that all MIDI messages queued up in the system would be read at the same time before going back to checking the pots.

    msg = midiuart.receive()
    while (msg is not None):
        if (not isinstance(msg, MIDIUnknownEvent)):
            midiuart.send(msg)
        msg = midiuart.receive()

It will do for now. Moving forward, I might try the Winterbloom SmolMIDI library. If that still doesn’t give me some useful performance then I might have to switch over to Arduino C.

Find it on GitHub here.

Closing Thoughts

The MIDI throughput is disappointing, but then I’ve never really gotten on with the Adafruit MIDI library. I use it as USB MIDI on Circuitpython is so easy, so will need to do something about that.

I’m still deciding on the PCB-sized supports too. The original seemed to have nicer diffusion of the LEDs, but that could have been the difference between 5mm SMT neopixels and these THT APA106s which seem more directional in the first place.

And I really ought to finish the 3D printed case properly too.

So this is “that will do” for now, but I ought to come back and finish it off properly at some point.

Kevin

#APA106 #circuitpython #ForbiddenPlanet #Krell #midi #midiController #NeoPixel #potentiometer #rp2040 #WaveshareZero

Finally calling this done! Say hello to the HellSplit a hand-wired, asymmetric 40% split #ortholinear keyboard with vertical column stagger and two rotary encoders. Powered by a pair of Raspberry Pi Pico's #RP2040 and #KMK firmware

#mechanicalkeyboards #splitkeyboard #ergo #otho #mechkb #splitkb #pipico #raspberypipico #40percent #handwired #circuitpython @circuitpython @RaspberryPi @rpimag

@tobozo I tried it. What a difference!

Now the RSSI is at around -40 to -42 and there are no send errors, send retries or send timeouts since I added the antenna.

Very cool 😎 as I can keep using these modules after all.

I also figured out how to get them fully running on CircuitPython.

This was my first time soldering after probably more than 20 years ...

#esp32 #esp32s3 #soldering #diy #circuitpython

🎄Reminder that @pyladiesdub end of the year event is on tomorrow evening& kindly hosted by DIGIT Games Studio. 🍕☕️

🍪💻 I'll be bringing freshly baked cookies & some wip #CircuitPython projects.

🧣Keep warm and see y'all there tomorrow evening!

#mastodaoine #pyladies #IrishTechCommunity #diversityintech #python #PleaseShare https://mastodon.ie/@whykay/113475608499071813

How to Re-initialize a Stuck #ESP32 (in #CircuitPython) -- something I needed when working on my particulate air quality #sensor but I'm sure I'll need it for many other projects:

https://shallowsky.com/blog/hardware/esp32-reconnect.html

#hardware #maker

#introductions my name is Andy and I’m a British expat living in Amsterdam, NL (for ten years now!). I’m a designer (manager) by trade and a maker in my heart.

Follow me for:
#maker
#3dprinting
#electronics
#raspberrypi
#MechanicalKeyboard
#HandWiredKeyboard
#SplitKB
#RaspberryPiPico
#circuitpython
#neopixels
#rgbleds
#companionbot
#internetofthings
#HomeAssistant
#EspHome

The Past, Present, and Future of CircuitPython - Modern microcontrollers like the RP2040 and ESP32 are truly a marvels of engineeri... - https://hackaday.com/2023/08/01/the-past-present-and-future-of-circuitpython/ #softwaredevelopment #hackadaycolumns #circuitpython #micropython #adafruit #hackchat #python

I finally wrapped up my custom mini #cyberdeck build last night. Uses a #waveshare ESP32-S3 touchscreen and a mini "OS" built using #circuitpython I wrote a blog post about the build (including links to download the #3dprint models and code) https://andywarburton.co.uk/post/gr3ml1n-a-compact-handheld-cyberdeck-built-for-chaos

#electronics #diy #maker #esp32 #3dprinting

Finally calling this done! Say hello to the HellSplit a hand-wired, asymmetric 40% split #ortholinear keyboard with vertical column stagger and two rotary encoders. Powered by a pair of Raspberry Pi Pico's #RP2040 and #KMK firmware

#mechanicalkeyboards #splitkeyboard #ergo #otho #mechkb #splitkb #pipico #raspberypipico #40percent #handwired #circuitpython @circuitpython @RaspberryPi @rpimag

Finally calling this done! Say hello to the HellSplit a hand-wired, asymmetric 40% split #ortholinear keyboard with vertical column stagger and two rotary encoders. Powered by a pair of Raspberry Pi Pico's #RP2040 and #KMK firmware

#mechanicalkeyboards #splitkeyboard #ergo #otho #mechkb #splitkb #pipico #raspberypipico #40percent #handwired #circuitpython @circuitpython @RaspberryPi @rpimag

Finally calling this done! Say hello to the HellSplit a hand-wired, asymmetric 40% split #ortholinear keyboard with vertical column stagger and two rotary encoders. Powered by a pair of Raspberry Pi Pico's #RP2040 and #KMK firmware

#mechanicalkeyboards #splitkeyboard #ergo #otho #mechkb #splitkb #pipico #raspberypipico #40percent #handwired #circuitpython @circuitpython @RaspberryPi @rpimag

Finally calling this done! Say hello to the HellSplit a hand-wired, asymmetric 40% split #ortholinear keyboard with vertical column stagger and two rotary encoders. Powered by a pair of Raspberry Pi Pico's #RP2040 and #KMK firmware

#mechanicalkeyboards #splitkeyboard #ergo #otho #mechkb #splitkb #pipico #raspberypipico #40percent #handwired #circuitpython @circuitpython @RaspberryPi @rpimag

Finished my new keyboard! it’s an evolution of my old keyboard with some function keys and media keys moved to the top right so I stop pressing mute instead of ctrl! It is a little taller than I like but the design I layered so I think I can shave off at least 5mm without too much hassle (probably more!)

#3dprinted #3dprinting #olkb #handwired #handwiredkeyboard #ortholinear #ortholinearkeyboard #joescotto #circuitpython #kmk #mechanicalkeyboard #mechanicalkeyboards #polymaker #prusament

Finished my new keyboard! it’s an evolution of my old keyboard with some function keys and media keys moved to the top right so I stop pressing mute instead of ctrl! It is a little taller than I like but the design I layered so I think I can shave off at least 5mm without too much hassle (probably more!)

#3dprinted #3dprinting #olkb #handwired #handwiredkeyboard #ortholinear #ortholinearkeyboard #joescotto #circuitpython #kmk #mechanicalkeyboard #mechanicalkeyboards #polymaker #prusament

Finished my new keyboard! it’s an evolution of my old keyboard with some function keys and media keys moved to the top right so I stop pressing mute instead of ctrl! It is a little taller than I like but the design I layered so I think I can shave off at least 5mm without too much hassle (probably more!)

#3dprinted #3dprinting #olkb #handwired #handwiredkeyboard #ortholinear #ortholinearkeyboard #joescotto #circuitpython #kmk #mechanicalkeyboard #mechanicalkeyboards #polymaker #prusament

Finished my new keyboard! it’s an evolution of my old keyboard with some function keys and media keys moved to the top right so I stop pressing mute instead of ctrl! It is a little taller than I like but the design I layered so I think I can shave off at least 5mm without too much hassle (probably more!)

#3dprinted #3dprinting #olkb #handwired #handwiredkeyboard #ortholinear #ortholinearkeyboard #joescotto #circuitpython #kmk #mechanicalkeyboard #mechanicalkeyboards #polymaker #prusament

Finished my new keyboard! it’s an evolution of my old keyboard with some function keys and media keys moved to the top right so I stop pressing mute instead of ctrl! It is a little taller than I like but the design I layered so I think I can shave off at least 5mm without too much hassle (probably more!)

#3dprinted #3dprinting #olkb #handwired #handwiredkeyboard #ortholinear #ortholinearkeyboard #joescotto #circuitpython #kmk #mechanicalkeyboard #mechanicalkeyboards #polymaker #prusament

I’ve had an Adafruit Macropad for a little over 3 years, and while I was working from home at the start of that period it was permanently on, connected to my MacBook Pro on my desktop, with a variety of shortcuts configured for driving different apps that I used day-to-day. My configuration is on GitHub.

More recently, I have not been using it nearly as much.

Last weekend for our Makeroni meetup, I pulled it out of my kit bag and started to tinker some more. I have a variety of additional Qwiic / StemmaQT controls and sensors that I wanted to play with, so I updated to the most recent stable build of CircuitPython and started to have a look at them.

I also noticed that it is a nice size to act as a companion device to the MNT Pocket Reform…

I noticed a problem – there was some burn-in on the OLED display where it had been mostly always-on in the past (lesson learned, to manage the screen output more carefully!) – but fortunately, Adafruit have done a lovely job of making that easy to replace. I also think it might be nice to have that screen wedged up at a slight angle to aid readability.

I have a notion that I can 3D print a case to more-or-less match the look of my Hyper Purple laptop. I don’t have an identical colour of filament, but I do have a range of options. I also ordered a bunch of different knobs for the potentiometer, and some alternate keycaps, so that I can make the look a bit more consistent as well.

I don’t have a final case design yet (and I need to spend some time properly learning FreeCAD and/or Fusion360, really), and I also haven’t finished modifying the macros code to match what I’m using on Debian on the Pocket Reform, but this is just some work-in-progress.

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https://andypiper.co.uk/2024/08/30/keypad-hacking/

#Blaugust2024 #100DaysToOffload #3dPrinting #adafruit #circuitpython #hardware #keypad #macropad #maker #mntPocketReform #pocketreform #rp2040 #Technology

Notes for April 29-May 5

Following up on my display hackery, I upgraded my SK1’s firmware to the latest iteration, which didn’t really fix its display (it now displays thumbnails, but all the responsiveness bugs I mentioned i(...)

#6dof #circuitpython #flatpak #hardware #imu #lxc #sk1

https://taoofmac.com/space/notes/2024/05/05/1730

Anyone know if the Circuitpython Neopixel implementation uses PIO on the RP2040? The existence of neopixel_write in the HAL for CP implies it does...

But if so, what if you have an application that also wants to use PIO? How are conflicts managed?

#RP2040 #PIO #CircuitPython

Finished building my new hardwired split mechanical keyboard this weekend! #3dprinted based on my own design, spray painted and powered by a pair of Raspberry Pi Pico W’s. Of course, it’s running my fave #keyboard firmware #KMK! Sadly #CircuitPython doesn’t yet support BLE on the PicoW so it’s not wireless yet, but I’m just counting down the days!

(more details in the image alt text!)

#olkb #splitkeyboard #ergokeyboard #mechanicalkeyboard #pipico #picow #raspberrypi #handwiredkeyboard

Here's a #DIYSynth idea I'm working on: a really thin & simple #RaspberryPiPico-based synth with only capsense buttons, OLED, reverse-mount NeoPixels and USB & TRS #MIDI In. Less than 7mm thick. (not final artwork ofc) A platform to run #Mozzi synth library & some #CircuitPython sample-based stuff

My plan for the day is to see if I can turn these components into something that makes noise, following @todbot's CircuitPython synthio tutorials

https://github.com/todbot/CircuitPython_Synthio_Tutorial/tree/main?tab=readme-ov-file

#CircuitPython #synthio #ESP32C3 #weeknotes

My Raspberry Pi Pico 2-based Dub siren now has a simple synth engine in addition to a sample engine, so its sounds now range from classic siren sounds to air horns and vocal snippets.

In this short video I show off the synth engine: 🎹🔈🎶

https://v.basspistol.org/w/qmjJ3TY8Q8mEzigVywDXmt

thx again 2 @todbot

And if you haven't seen it yet check out this video for yesterday's exploration of the sample engine: 📯🔈🎶

https://v.basspistol.org/w/pS4PrN9Wjo5eFP4hqFSpYr

#CircuitPython #AudioElectronics #SynthDIY #RP2350 #synths #SynthIO #BonkWave

The new audio effects libraries in CircuitPython are super fun. Here's a quick "taster" showing off some of them, part of my impending "Synthio Tutorial". Thanks Mark & Cooper for making them!
https://www.youtube.com/watch?v=nyv7XlQ1d00
#CircuitPython #synthio #audioeffects #synthdiy

Okay here’s a thing from an hour of goofin’: algorithmic music generator using a rotary encoder, a round TFT, and an I2S DAC in CircuitPython
https://www.youtube.com/watch?v=cCTPtk6KQQk
code: https://gist.github.com/todbot/7dc50b8de8db03638a9a291e9132b488
#CircuitPython #RP2350 #Pico2 #synthio #RaspberryPiPico2 #RaspberryPiPico

Paul got me a CircuitPython synthio shirt! Thanks @prcutler! It’s a wonderful #CircuitPythonDay2024 present! #CircuitPython #synthio https://hachyderm.io/@prcutler/112972142726716429

Here it comes, #CircuitPythonDay2024!
In celebration, a sketch that somewhat recreates the THX "Deep Note" sound on SparkFun Pro Micro #RP2350.
The messy code: https://gist.github.com/todbot/046b1c8243002ef76c5e2fabae84ba0e
#CircuitPython #synthio #RaspberryPiPico

The “picotouch_drumcard” boards showed up today! I put some software on it too. A few gotchas in my design but I can make it work. Now on to sample playback, since this is labelled a drum machine after all
#CircuitPythonDay2024 #CircuitPython #raspberrypipico #synthio

I made a little 3d-printable case for my “qtpy_synth” test board to help me play with CircuitPython synthio (and Arduino Mozzi). It works pretty well, I like it better than the standoffs I originally started with. And now can have some cool matching 3d-printed knobs! https://www.printables.com/model/757087-case-for-qtpy_synth-circuitpython-synthesizer
more about qtpy_synth: https://github.com/todbot/qtpy_synth
#CircuitPython #synthio #rp2040 #qtpy #synthDIY