A major step toward fully 3D-printed active electronics

By fabricating semiconductor-free logic gates, which can be used to perform computation, researchers hope to streamline the manufacture of electronics.

The devices are made from thin, 3D-printed traces of the copper-doped polymer. They contain intersecting conductive regions that enable the researchers to regulate the resistance by controlling the voltage fed into the switch.

https://news.mit.edu/2024/mit-team-takes-major-step-toward-fully-3d-printed-active-electronics-1015

Making DIY Electronic Calipers

Such calipers work via capacitive coupling between a PCB on the powered slidey display and a passive PCB “scale” in the stationary spine.

https://kevinlynagh.com/calipertron/

FCC OPENS ENTIRE 6 GHz BAND TO VERY LOW POWER DEVICE OPERATIONS

https://docs.fcc.gov/public/attachments/DOC-408129A1.txt

#IoT #VLP

Touchscreens Are Out, and Tactile Controls Are Back

Rachel Plotnick’s “re-buttonization” expertise is in demand

https://spectrum.ieee.org/touchscreens

UNISoC's 5G IoT solution adopts the chip design at the industrial level and has the characteristics of wide temperature (working environment temperature can reach -40℃ ~ +85℃), which can be widely used in various vertical industries and terminal forms of 5G, enabling 5G industrial IoT.
https://www.unisoc.com/en_us/sch/T5G

No more needles! Tracking blood sugar on your wrist

Waterloo researchers design wearable tech that can sense glucose levels for diabetics more accurately than ever before

“We’ve developed radar technology that can now fit inside a smart watch and sense glucose levels more accurately than ever before,” Shaker said. “Just like you use glasses to improve your vision, our technology helps for better sensing of glucose levels.”

To explain how the new system works, Shaker points to weather satellites that use radar to monitor the Earth’s atmosphere and, for example, measure storm movements and other kinds of cloud cover.

“We’ve figured a way to miniaturize these radar systems on satellites and put them in a wearable device and use the same radar technology that looks at changes in the atmosphere to look at changes in the human body,” he said

The system’s key components are a radar chip, which sends and receives signals through the body, an engineered “meta-surface”, which helps focus these signals for better accuracy, and microcontrollers, which process the radar signals using artificial intelligence algorithms. The algorithms improve the accuracy and reliability of the readings by learning from the data over time.

#CGM

Apple's Non-Invasive Blood Glucose Sensor

https://www.patentlyapple.com/2025/02/a-federal-judge-has-invalidated-an-omni-medsci-patent-which-could-open-the-door-for-a-blood-glucose-solution-for-apple-watch.html

#CGM

PiLiDAR - DIY 360° 3D Panorama LiDAR Scanner

https://github.com/PiLiDAR/PiLiDAR

#rPi

Brandon's Semiconductor Simulator

https://brandonli.net/semisim/

Reverse-Engineering Starlink User Terminal

https://www.darknavy.org/blog/a_first_glimpse_of_the_starlink_user_ternimal/

Getting Started with Software-Defined Radio
by David Clark and Paul Clark

March 2025, 336 pp.
ISBN-13:
9781718502543

#SDR

Staying Cool Without Refrigerants:
Next-Generation Nano-engineered Thermoelectrics Peltier Cooling Enable Scalable, Compressor-Free Cooling

A close-up look at the testing and ice buildup on a CHESS-based thermoelectric device. This testing system helps evaluate how efficiently the new materials convert electricity into cooling, paving the way for more effective cooling and energy-harvesting technologies.

https://www.jhuapl.edu/news/news-releases/250521-apl-thermoelectrics-enable-compressor-free-cooling

#Peltier #TEC

In the Samsung Bespoke AI Hybrid Refrigerator, a Peltier device is mounted at the top of the interior, while an AI Inverter Compressor is installed at the bottom.

https://news.samsung.com/global/interview-staying-cool-without-refrigerants-how-samsung-is-pioneering-next-generation-peltier-cooling

#Peltier #TEC

How the Apple Watch measures your blood oxygen saturation

The back of the Apple Watch shines light of a specific wavelength into your skin and measures the reflected light. Heart rate sensing uses green (525 nm) and infrared (850–940 nm) light; blood oxygen sensing added a red light at 660 nm in 2020.

The iPhone will now calculate the ratio of absorbed red to infrared light, then apply calibration constants from experimental data to estimate blood oxygen saturation.

https://www.empirical.health/metrics/oxygen/

Using Wi-Fi Signals to Measure Heart Rate

These results were found using ultra-low-cost ESP32 chips, which retail between $5 and $10 and Raspberry Pi chips, which cost closer to $30. Results from the Raspberry Pi experiments show even better performance. More expensive WiFi devices like those found in commercial routers would likely further improve the accuracy of their system.

https://news.ucsc.edu/2025/09/pulse-fi-wifi-heart-rate/

#rPi #ESP32 #WiFi

60 GHz radar sensors for IoT

Infineon's highly integrated XENSIV™ 60 GHz mmWave radar sensors offer advance sensing capabilities with high precision and low power consumption. Their small form factor enables contactless sensing features for a wide range of applications from simple motion detection and presence sensing to people tracking, gesture control, or vital signs sensing such as heart and respiration rates.

Key Features
Small form factor
Extremely low power consumption
Highly integrated MMICs
Antennas in Package (AIP)
High sensitivity
High accuracy
High resolution
High bandwidth for FMCW operations

Applications
Complete system solutions for smart TVs
Robotics
Heating ventilation and air conditioning (HVAC)
Connected and smart LED lighting for IoT
Security camera and video doorbell
Smart thermostat
Presence sensing

https://www.infineon.com/products/sensor/radar-sensors/radar-sensors-for-iot/60ghz-radar

#IoT

Electron-beam additive manufacturing, or electron-beam melting (EBM) is a type of additive manufacturing, or 3D printing, for metal parts. The raw material (metal powder or wire) is placed under a vacuum and fused together from heating by an electron beam. This technique is distinct from selective laser sintering as the raw material fuses have completely melted. Selective Electron Beam Melting (SEBM) emerged as a powder bed-based additive manufacturing (AM) technology and was brought to market in 1997 by Arcam AB Corporation headquartered in Sweden.

High-Power Microwave Defeats Drone Swarm

https://www.epirusinc.com/press-releases/epirus-leonidas-high-power-microwave-defeats-49-drone-swarm-100-of-drones-flown-at-live-fire-demonstration

Apple iPhone 16e 163-page PDF schematics showing the electrical schematics for the iPhone 16e

Allegro Design Publisher for System Capture

#R2R #RightToRepair

Samsung makes ads on $3,499 smart fridges official with upcoming software update

Update introduces two ways for the fridges to show ads.

So you're going to have to PI-hole your refrigerator!

https://arstechnica.com/gadgets/2025/10/samsung-makes-ads-on-3499-smart-fridges-official-with-upcoming-software-update/

#rPi #piHole

The Connectivity Standards Alliance Announces Zigbee 4.0 and Suzi: Empowering the Next Generation of Secure, Interoperable IoT Devices

Strengthening Security, Range, and Interoperability

Introducing Suzi: Expanding Connectivity Through Long-Range Mesh Networking

Long-range mesh network that gives people the ability to connect more devices and expand the reach of their connected environments.

Suzi unlocks new applications and use cases in the residential, commercial, and industrial space by enabling the first widely adopted standard for Sub-GHz mesh network. Suzi is built on market-proven Zigbee network-layer routing, offers many of the same features, but on a lower frequency.

Source

#IoT #Zigbee #Suzi