Large Skadis mount pen holder #3DPrinting #3DThursday

BlaeceAelf shares:

I got tired of the basic (or with weakly designed tabs) skadis pen/pencil holders so I put this one together.

Simply put, it works. It works well. It’s large. It holds lots of pens and pencils and markers, or other things.

I like it…you should like it too.

download the files on: https://www.thingiverse.com/thing:7314250

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Every Thursday is #3dthursday here at Adafruit! The DIY 3D printing community has passion and dedication for making solid objects from digital models. Recently, we have noticed electronics projects integrated with 3D printed enclosures, brackets, and sculptures, so each Thursday we celebrate and highlight these bold pioneers!

Have you considered building a 3D project around an Arduino or other microcontroller? How about printing a bracket to mount your Raspberry Pi to the back of your HD monitor? And don’t forget the countless LED projects that are possible when you are modeling your projects in 3D!

LIVE CHAT IS HERE! http://adafru.it/discord

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Shop for parts to build your own DIY projects http://adafru.it/3dprinting

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LIVE NOW! SHOW and TELL 4/22/2026 with @blitzcitydiy #ShowandTell @adafruit

The biggest and longest running worldwide online Show and Tell LIVE! Right now! 4/22/2026 at 7:30pm Eastern. – video.

Hosted this week by Liz Clark.

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CircuitPython 10.2.0 Released!

From the GitHub release page:

This is CircuitPython 10.2.0, a minor revision of CircuitPython, and is a new stable release.

Highlights of this release

• New audiotools.SpeedChanger.
• New qspibus support for displayio.
• Stability improvements to USB SD card handling.
• Merge of MicroPython v1.27.
• Update to ESP-IDF v5.5.3.
• Many additions to the Zephyr port.
• Simulated hardware testing is now being done in the Zephyr port.

Download from circuitpython.org

Firmware downloads are available from the downloads page on circuitpython.org. The site makes it easy to select the correct file and language for your board.

Installation

To install follow the instructions in the Welcome to CircuitPython! guide. To install the latest libraries, see this page in that guide.

Try code.circuitpython.org or the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).

Documentation

Documentation is available in readthedocs.io.

Port status

CircuitPython has a number of “ports” that are the core implementations for different microcontroller families. Stability varies on a per-port basis. As of this release, these ports are consider stable (but see Known Issues below):

• atmel-samd: Microchip SAMD21, SAMx5x
• cxd56: Sony Spresense
• espressif: Espressif ESP32, ESP32-C2, ESP32-C3, ESP32-C6, ESP32-C61, ESP32-H2, ESP32-S2, ESP32-S3
• nordic: Nordic nRF52840, nRF52833
• raspberrypi: Raspberry Pi RP2040, RP2350
• stm: ST STM32F4 chip family

These ports are considered alpha and will have bugs and missing functionality:

• analog: Analog Devices MAX32690
• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• espressif: , ESP32-P4
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families
• zephyr: multiplatform RTOS, running on multiple chip families

Changes since 10.1.4 and 10.2.0-alpha.1

Fixes and enhancements

• Fix web workflow background callback handling. #10966. Thanks @dhalbert.
• Fix sdcardio.SDCard regression that failed to init some cards. #10956. Thanks @dhalbert and @bablokb.
• Update frozen libraries. #10945, #10853, Thanks @dhalbert and @FoamyGuy.
• Merge MicroPython v1.27 into CircuitPython. #10931. Thanks @dhalbert.
• Fix palette length validation in _stage. #10904. Thanks @deshipu.
• Add audiotools.SpeedChanger. #10900. Thanks @todbot.
• Add mcp4822 SPI DAC support. #10895. Thanks @todbot.
• Improve USB SD presentation, sdcardio implementation, displayio bus sharing. #10887. Thanks @dhalbert.
• Add arg validations in various bitmaptools methods. #10884. Thanks @FoamyGuy.
• Merge 10.1.x fixes. #10877, #10839. Thanks @dhalbert.
• Fix handling of full-width glyphs in lvfontio. #10865. Thanks @FoamyGuy.
• Added displayio qspibus support. #10844. Thanks @ppsx.

Port and board-specific changes

Analog Devices

Broadcom

Espressif

• Change USB task priority to be the same as the CircuitPython task. #10887. Thanks @dhalbert.
• Fix BLE startup crash. #10858. Thanks @tannewt.
• Update to ESP-IDF 5.5.3. #10840. Thanks @tannewt.

i.MX

Nordic

renode

RP2

• Fix i2ctarget bugs. #10933. Thanks @FoamyGuy.
• Fix i2ctarget start bug. #10474. Thanks @MarkEbrahim.

SAMx

SiLabs

Spresense

STM

• Move SPI deinit code to prevent crash. #10926. Thanks @ChrisNourse.

Zephyr

• Fix flash size on Feather RP240. #10960. Thanks @FoamyGuy.
• Enable jpegio, getpass, adafruit_bus_device, hashlib, zlib, aesio, msgpack. #10952, #10949, #10943, #10939, #10932, #10927. Thanks @FoamyGuy.
• Add nvm support. #10918. Thanks @tannewt.
• Add Adafruit Feather RP240. #10925. Thanks @FoamyGuy.
• Add Adafruit Feather nRF2840 Sense. #10923. Thanks @tannewt.
• Add Raspberry Pi Pico, Pico W, Pico2, Pico2 W. #10917. Thanks @tannewt.
• add audiobusio.I2SOut support. #10916. Thanks @tannewt.
• Zephyr port and build fixes. #10912, #10911, #10863, #10860, #10859. Thanks @tannewt.
• Allow building and uploading native_sim .exe. #10897. Thanks @tannewt.
• Add heap statistics tracking to native_sim. #10869. Thanks @tannewt.
• Add zephyr_display to support fixed Zephyr displays. #10868. Thanks @tannewt.
• Implement _bleio scanning, advertising, connect, and disconnect. #10862, #10833. Thanks @tannewt.
• Add TCP neworking support. #10847. Thanks @tannewt.
• Test simulated hardware using perfetto traces. #10846. Thanks @tannewt.
• Handle time simulation without using yields. #10834. Thanks @tannewt.

Individual boards

• Adafruit QT Py ESP32-S3 4/2 and 8/0: reduce default WiFi power to 15 dBm. #10921. Thanks @jesseadams.
• Cytron Maker Pi RP2040: add GP29 pin definitions. #10893. Thanks @CytronTechnologies.
• uGame S3: slow down SPI to avoid display glitches. #10837. Thanks @deshipu.

Documentation changes

• Fix typo in tim.monotonic_ns(). #10950. Thanks @tannewt.
• Explain SD card initialization more thoroughly. #10962, #10947. Thanks @mikeysklar.
• Correct return type in busio.I2C.probe(). #10891. Thanks @FoamyGuy.

Build and infrastructure changes

• Update CI actions to Node.24 versions. #10910. Thanks @dhalbert.
• Fix ReadTheDocs build warnings. #10907. Thanks @dhalbert.
• Add support for user-supplied build configuration files: user_pre_mpconfigport.mk, user_post_mpconfigport.mk, user_post_circuitpy_defns.mk. #10817. Thanks @bablokb.

Translation additions and improvements

New boards

• Pimoroni Badger2350. #10929. Thanks @bablokb.
• Pimoroni Explorer RP2350. #10778. Thanks @tyeth.
• TinyCircuits Thumby and Thumby Color. #10851, #10303. Thanks @tannewt.
• Waveshare ESP32-S# Touch AMOLED 2.41″. #10844. Thanks @ppsx.
• WeAct Studio RP2350B Core. #10646. Thanks @cvmanjoo.
• Xteink X4. #10873. Thanks @BlitzCityDIY.

Known issues

• ESP32-C6 networking is not working well.
• The CIRCUITPY drive is not working on at least some STM32 boards.
• Native-code .mpy files are not working. This capability is currently enabled only on the winterbloom_sol board.
• See https://ift.tt/Z7CH2JT for other issues, including issues still to be addressed for:
  • 10.2.x
  • 10.x.x
  • 11.0.0
  • long term

Thanks

Thank you to all who used, tested, and contributed toward this release, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.

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Printed Neurons Communicating with Living Brain Cells

To move closer to a biological model, Mark Hersam’s team developed artificial neurons using soft, printable materials that better mimic the brain’s structure and behavior. The backbone of that advance is a series of electronic inks. Photo by Mark Hersam via Northwestern University

Engineers at Northwestern University printed artificial neurons capable of communicating with the brain.

In a new study, the Northwestern team developed flexible, low-cost devices that generate electrical signals realistic enough to activate living brain cells. When tested on slices of tissue from mouse brains, the artificial neurons successfully triggered responses from real neurons, demonstrating a new level of biocompatibility.

The work marks a step toward electronics that can communicate directly with the nervous system, with potential applications in brain-machine interfaces and neuroprosthetics, including implants for hearing, vision and movement.

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The 80386 memory pipeline

nand2mario on The Small Things Retro blog discusses the 80386 microprocessor memory pipeline:

The FPGA 386 core I’ve been building now boots DOS, runs applications like Norton Commander, and plays games like Doom. On DE10-Nano it currently runs at 75 MHz. With the core now far enough along to run real software, this seems like a good point to step back and look at one of the 80386’s performance-critical subsystems: its memory pipeline.

32-bit Protected Mode was the defining feature of the 80386. In the previous post, I looked at one side of that story: the virtual-memory protection mechanisms. We saw how the 80386 implements protection with a dedicated PLA, segment caches, and a hardware page walker. This time I want to look at virtual memory from a different angle: the microarchitecture of the memory access pipeline, how address translation is made efficient, how microcode drives the process, and what kind of RTL timing the design achieves.

On paper, x86 virtual memory management looks expensive. Every memory reference seems to require effective address calculation, segment relocation, limit checking, TLB lookup, and, on a miss, two page-table reads plus Accessed/Dirty-bit updates. Yet Intel’s own 1986 IEEE ICCD paper, Jim Slager’s Performance Optimizations of the 80386, describes the common-case address path as completing in about 1.5 clocks. How did the 386 pull that off?

The answer is that virtual memory is not really a serial chain of checks, even if the diagrams make it look that way. It is a carefully overlapped memory pipeline that uses pre-calculation, pipelining, and parallelism to keep the common case surprisingly short.

Read more in the post here.

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Codex hacked a Samsung TV

Calif.io on GitHub documents how they gave Codex a foothold on a Samsung television. Then it popped root.

We started with a shell inside the browser application on a Samsung TV, and a fairly simple question: if we gave Codex a reliable way to work against the live device and the matching firmware source, could it take that foothold all the way to root?

Codex had to enumerate the target, narrow the reachable attack surface, audit the matching vendor driver source, validate a physical-memory primitive on the live device, adapt its tooling to Samsung’s execution restrictions, and iterate until the browser process became root on a real compromised device.

We didn’t provide a bug or an exploit recipe. We provided an environment Codex could actually operate in, and the easiest way to understand it is to look at the pieces separately.

See the details of the exploits in the post here and on GitHub.

 

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Cyber Gotchi: From Tamagotchi to Modern Digital Life

This fun project from Thai maker Yakroo will speak to anyone who grew up in the 90s:

In this project, we will build Cyber Gotchi, a digital life system that evolves from a simple virtual pet concept into a physical interactive device.

The system simulates a living digital creature with real-time internal states such as hunger, energy, and health. These states affect its behavior and appearance through animation, sound, and physical output.

Unlike traditional digital pets that exist only on a screen, Cyber Gotchi extends its “life” into the real world using hardware.

More details here on Instructables.

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