New current sensors have no magnetic circuits

Clemens Valens @ elektormagazine.com discuss about LEM’s new current sensors which do not use the Hall effect make the measurement. Instead they integrate conductors for gradient measurement and provide immunity against the external fields. He writes:

Here are some new integrated circuit transducers for AC and DC isolated current measurement up to 300 KHz that offer full isolation, despite their small size, by integrating the primary conductor for nominal current measurements of up to 30 A. The transducers are mounted directly onto a printed circuit board as SO8 or SO16 SMT devices and support overload currents up to 200 A peak for short durations (1 ms).

New current sensors have no magnetic circuits – [Link]

Wooden Digital Clock is controlled over WiFi

androkavo @ instructables.com build a nice looking wooden clock that is able to show time, temperature, humidity and also it has alarm. The clock is controlled through your web browser using wifi connectivity and it also has a vibration sensor to stop the alarm.

Wooden Digital Clock is controlled over WiFi – [Link]

Sound Activated LED Light With Timer

Clap to light switch with timer project is very useful project for power saving applications. The project switches on the LED light for 45 to 60 seconds when receives two clap sound. This project can be used in store room, toilets, dark area where switch is not visible, night lamp, places where light on off switch is not accessible easily.

Single transistor used as microphone preamplifier, diode converts AC signal in to DC , and PIC micro-controller take care of LED On/OFF Time, LED  time depends on two jumpers J1, J2 which provides four options s 45, 50, 55, 60 seconds. MJE3055 transistor used in output to drive LED, one series resistor R10 helps to control the current going through LED, R10 can be alter as per LED Voltage and current. 3V to 12V LED with maximum current 500mA can be used. Use higher current Darlington transistor like TIP147 for higher current Load. Onboard potentiometer trimmer for sound sensitivity adjust. D1 power LED.

Sound Activated LED Light With Timer – [Link]

HealthyPi v3 – Health HAT for Raspberry Pi

An open-source, multi-parameter, full fledged human body vital sign monitoring HAT for Raspberry Pi as well as standalone use.

HealthyPi is a do-it-yourself, open-source vital sign monitor based on the Raspberry Pi. THe HealthyPi board itself is a HAT add-on for the Raspberry Pi 3 which measures all the human body’s vital signs and sends it over to the Raspberry Pi. Couple it together with the official Raspberry Pi touchscreen and you’ve got a full-fledged vital sign monitor.

HealthyPi v3 – Health HAT for Raspberry Pi – [Link]

4.5 to 42V-in, 4 x 4mm, isolating buck DC-DC delivers 3.7A

by Graham Prophet @ eedesignnewseurope.com discuss about the MAX17682 buck DC-DC converter.

With details recently posted by Maxim integrated, MAX17682 is a high-voltage, high-efficiency, iso-buck DC-DC converter designed to provide isolated power up to 10W. The device operates over a 4.5V to 42V input voltage range and uses primary-side feedback to regulate the output voltage. It delivers primary peak current up to 3.7A and regulates primary output voltage to within ±1.2% over -40°C to +125°C.

AS7261 Color sensor from Ams

The AS7261 integrates Gaussian interference filter technology to enable chromatic white color sensor which provides direct XYZ color coordinates consistent with the CIE 1931 2° Standard Observer color coordinates. Additional mapping of XYZ coordinates to the x, y (Y) of the 2-dimensional color gamut and scales of the CIE 1976 u’v’ coordinate system, providing accurate Correlated Color Temperature (CCT) measurements and color point deviation from the black body curve for white light color in the ∆u’v’ coordinate system. A Near-IR channel and LED drivers with programmable currents increase application flexibility, including support for electronic shutter applications.

AS7261 Color sensor from Ams – [Link]

Meet Obsidian, A $99 Plug & Print 3D Printer

Kodama Inc is a new company that delivers a new generation of FDM 3D printers that increase the possibility of affordable 3D printing. Recently, Kodama launched its new 3D printer “Obsidian“, the first 3D printer made for professional applications starting at under $100.

Kodama, Inc. (PRNewsfoto/Kodama, Inc.)

Most additive manufacturing machines in this price range are not aesthetically designed, nor engineered for accurate printing. Many consumers who are eager to upgrade their skills set are unable to because there is no affordable 3D printer that boasts high-quality printing.

“We wanted to create a 3D printer that defies what’s on the market. A sleek design, high-quality printing, and customizable, all starting at under $100,” said Michael Husmann, the ex-Apple employee and founder of Kodama Inc.

Obsidian is designed to deliver 3D printing functionality and features are more commonly found in devices that cost at least $1,000. It also can print in very high accuracy with a layer thicknesses between 50-350 microns. Obsidian’s design provides a stable printing experience, while the customized internal components decreases the need for frequent maintenance and recalibration.

Obsidian’s features include:

  • Printing volume: 120 x 120 x 120 mm
  • Printing Resolution: 50-micron at a steady 70mm/s speed
  • Plug and Play: Obsidian comes fully assembled, making it easy to get printing started in a few minutes.
  • Smart Display: Obsidian’s UI was tailor-made for Kodama by automobile UX designers to be inviting for beginners while packing all the controls a power user needs.
  • App Control: Obsidian’s Pro’s display runs on Android, allowing a myriad of new features. You’ll be able to remotely monitor and adjust your print settings while recording time lapses and receive prompts when your print is done or if something needs your attention.
  • Wide Filament Compatibility: Obsidian works with most filaments on the market, making it the ideal 3D printer to complete a variety of projects.
  • Heated Bed: Expands printing options by allowing the user to print with ABS, PETG, and other filament types. Only available with Obsidian PRO.
  • Exclusive Obsidian PLA: Obsidian is a naturally formed volcanic crystal. This filament contains real crushed Obsidian powder stones, and is only available through Kodama.
  • Camera: Record time lapses and monitor prints remotely.

Kodama is planning to launch a Kickstarter campaign in June 2017, and it will offer limited Early Bird deals at $49 for the basic version of Obsidian.

Last year, Kodama raised over $1.6 million for Trinus, an all-metal 2-in-1 3D printer and laser engraver for under $500. Successfully shipping their breakthrough product to over 3,100 backers in 80 countries helped solidify Kodama, Inc. as an up-and-coming leader in affordable, high-quality 3D printing.

Nixie Bargraph Kit

Robin @ kickstarter.com launched his new campaign on a project using IN-9 Nixie tubes. Now you can easily control two IN-9 Nixie bargraph tubes with 2 PWM inputs from your Arduino, Raspberry or other control board. The tubes are controlled by PWM signals and adjusting the PWM duty cycle you can control the tubes height, thay easy!

I had the idea for this project after building myself a Nixie bargraph clock which looked fantastic and eye catching. Instead of using conventional nixie tubes, which use numbers to display the time, the time is indicated by the height of the neon glow. But, this isn’t just limited to displaying the time, anything can be indicated with these tubes, temperature, humidity, atmospheric pressure, proximity… anything!

µduino, The Smallest Arduino Ever

A new member to Arduino compatible devices is just here, the newest yet the smallest Arduino ever created, µduino!Believing that it is enough to include some bulky devices in our applications, the team behind µduino is trying to provide a shrinkified device that can be included anywhere. With the size of  12mm (0.5 inches) x 12mm, µduino is considered the smallest Arduino compatible device that compete with other similar microcontroller boards with power saving .

The µduino makes use of the power of the ATMEGA32U4 chip found in the Arduino Leonardo (a board over 20 times larger), offering 20 I/O ports, including PWM and ADC ports! In addition, the µduino can be powered by batteries or directly by micro-USB.

A list of µduino specifications is here:

  • ATMEGA32U4 microcontroller
  • 6x Analog I/O ports
  • 14x Digital I/O ports (including Rx/Tx)
  • Status LED
  • 5V voltage regulator (accepts up to 16V DC)
  • 6-pin ICSP programming ports (load custom bootloaders, program other boards, etc)
  • 2x 5V ports
  • 2x ground ports
  • 1x Analog reference voltage port
  • Reset button
  • 16 MHz precision crystal oscillator
  • MicroUSB port for easy programming and prototyping
  • 2x mounting holes (can be sewn into clothing)

Despite its small size, µduino is still powerful and capable to be included in many applications performing as full size Arduino boards. µduino team are planning to run a crowdfunding campaign on CrowdSupply but it is not launched yet. You can sign up here to receive more updates about µduino once launched.

The First 3D Quantum Liquid Crystals

Strong electron interactions can drive metallic systems toward a variety of well-known symmetry-broken phases, but the instabilities of correlated metals with strong spin-orbit coupling have only recently begun to be explored.

A team of physicists at the Institute for Quantum Information and Matter at Caltech, had discovered an new state of matter that may have applications in ultra-fast quantum computers of the future. It is the first three-dimensional quantum liquid crystal.

“We have detected the existence of a fundamentally new state of matter that can be regarded as a quantum analog of a liquid crystal, There are numerous classes of such quantum liquid crystals that can, in principle, exist; therefore, our finding is likely the tip of an iceberg.” says Caltech assistant professor of physics David Hsieh, principal investigator on a new study describing the findings in the April 21 issue of Science.

Liquid crystals are materials that are between liquid and solid, they are consisted of molecules that flow around freely as if they were a liquid but are all oriented in the same direction, as in solid. An important feature of the liquid crystals that in addition to availability in the nature, they can be made artificially like those used in items that have display screens.

In 1999, the first quantum liquid crystal was discovered by Caltech’s Jim Eisenstein, the Frank J. Roshek Professor of Physics and Applied Physics. It was a two-dimensional which means that it was limited with a single plane inside the host material. In a quantum liquid crystal, electrons behave like the molecules in classical liquid crystals. They move around freely in a preferred direction of flow.

These images show light patterns generated by a rhenium-based crystal using a laser method called optical second-harmonic rotational anisotropy. At left, the pattern comes from the atomic lattice of the crystal. At right, the crystal has become a 3-D quantum liquid crystal, showing a drastic departure from the pattern due to the atomic lattice alone.

The behavior of the electrons in the newly discovered 3D-variant are possibly even stranger. The electrons do not only distinguish between x-, y- and z-axis, but they also have different magnetic characteristics depending along which axis they move back and forth.

According to the researchers, the 3D quantum liquid crystals could play a role in a field called spintronics, where the spin direction of electrons can be utilized to create more efficient computer chips. It may also help with some of the challenges of building a quantum computer, which seeks to take advantage of the quantum nature of particles to make even faster calculations.

“Rather than rely on serendipity to find topological superconductors, we may now have a route to rationally creating them using 3-D quantum liquid crystals” says Harter. “That is next on our agenda.”

You can read more about this research through the published paper and by reading Caltech’s post.