Air Quality Sensors on tindie.com

Pesky Products @ tindie.com writes:

This is a small (17.9 mm x 10.3 mm) breakout board with Bosch’s BME280 pressure, temperature, and humidity sensor as well as AMS’ CCS811 digital gas sensor. The sensors work in concert to provide a complete measurement via I2C register reads of indoor air quality including temperature- and humidity-compensated estimates of equivalent CO2 concentration in parts per million (400 – 8192 ppm) and volatile organic chemical concentration in parts per billion (0 – 1187 ppb).

Air Quality Sensors on tindie.com – [Link]

Lowest power magnetic switch uses nanoamps

Crocus Technology is introducing its CT832 Digital Magnetic Switch, in the CT83X series, a multi- function switching device with high sensitivity, reliability and new lows in power consumption, that it positions as the industry’s lowest power consuming switch.

Lowest power magnetic switch uses nanoamps – [Link]

Linear applies switched-capacitor step-down topology for inductor-less DC/DC

Graham Prophet @ eedesignnewseurope.com discuss about the new Linear’s step-down inductor-less controller.
LTC7820 is, a high power fixed ratio charge pump DC/DC controller that eliminates the power inductor in a non-isolated intermediate bus converter, allowing up to a 50% reduction in circuit size and up to 4000 W/in³ power density. The 72V fixed-ratio DC/DC controller can deliver 500W. – See more at: http://www.eedesignnewseurope.com/news/linear-applies-switched-capacitor-step-down-topology-inductor-less-dcdc#sthash.pJcu7NoB.dpuf

SUNY Polytechnic Creates 3-in-1 Device That Can Be A Diode, A MOSFET And A BJT

In a recently published study, a team of researchers at SUNY Polytechnic Institute in Albany, New York, has suggested that combining multiple functions in a single semiconductor device can significantly improve device’s functionality and efficiency.

Nowadays, the semiconductor industry is striving to scale down the device dimensions in order to fit more transistors onto a computer chip and thus improve the speed and efficiency of the devices. According to Moore’s law, the number of transistors on a computer chip cannot exponentially increase forever. For this reason, scientists are trying to find other ways to improve semiconductor technologies.

To demonstrate the new technology which can be an alternative to Moore’s law, the researchers of SUNY Polytechnic designed and fabricated a reconfigurable device that can be a p-n diode (which functions as a rectifier), a MOSFET (for switching), and a bipolar junction transistor (or BJT, for current amplification). Though these three devices can be fabricated individually in modern semiconductor fabrication plants, it often becomes very complex if they are to be combined.

reconfigurable 3-in-1 semiconductor device
the reconfigurable 3-in-1 semiconductor device

Ji Ung Lee at the SUNY Polytechnic Institute said,

We are able to demonstrate the three most important semiconductor devices (p-n diode, MOSFET, and BJT) using a single reconfigurable device. We can form a single device that can perform the functions of all three devices.

The multitasking device is made of 2-D tungsten diselenide (WSe2), a new transition metal dichalcogenide semiconductor. This class of materials is special as the bandgap is tunable by varying the thickness of the material. It is a direct bandgap while in single layer form.

Another challenge was to find a suitable doping technique as WSe2 lacks one being a new material. So, to integrate multiple functions into a single device, the researchers developed a completely new doping method. By doping, the researchers could obtain properties such as ambipolar conduction, which is the ability to conduct both electrons and holes under different conditions. Lee said,

Instead of using traditional semiconductor fabrication techniques that can only form fixed devices, we use gates to dope.

These gates can control which carriers (electrons or holes) should flow through the semiconductor. In this way, the ambipolar conduction is achieved. The ability to dynamically change the carriers allows the reconfigurable device to perform multiple functions. Another advantage of using gates in doping is, it saves overall area and enable more efficient computing. As consequence, the reconfigurable device can potentially implement certain logic functions more compactly and efficiently.

In future, researchers plan to investigate the applications of this new technology and want to enhance its efficiency further. As Lee said,

We hope to build complex computer circuits with fewer device elements than those using the current semiconductor fabrication process. This will demonstrate the scalability of our device for the post-CMOS era.

Twiz – Tiny Wireless IMUs

Tiny Wireless IMUs – 100% open & autonomous 9DoF motion sensor using BLE to control anything from your [objects] motion ! by Drix @ hackaday.io:

We looked for tiny, autonomous, easy to use, and 9 Degrees of Freedom IMU, but none of the available wireless motion sensors were affordable enough to really unlock creativity, so we built one.

Twiz – Tiny Wireless IMUs – [Link]

Samba : Set Up Your Raspberry Pi As A Local Network File Server

Samba is the Linux implementation of the SMB/CIFS file sharing standard used by Windows PCs and Apple computers and widely supported by media streamers, gaming consoles, and mobile apps. In this tutorial, you will learn how to use a Raspberry Pi as a file server where you can save backups and share files with all the other computers on your network using Samba.

You need the following things for this tutorial:

  • A keyboard (Wired or wireless)
  • A mouse (Wired or wireless)
  • Raspberry Pi (Model 3B is recommended)
  • A 32GB (or smaller) micro SD card
  • Internet connection (Only to download Samba)

The SD card must have a reasonable amount of free storage space without requiring any extra steps to make it accessible. However, if you want extra storage, simply mount a large USB drive and create a Samba entry for it. If you want to keep your Samba file server compact and portable, install Raspbian on a 128Gb or 256GB SD card. Before purchasing, check online whether the SD card is fully compatible with Raspberry Pi or not.

Install Samba

Samba is available in Raspbian’s standard software repositories. Update your repository index, make sure that the operating system is fully updated, and install Samba using apt-get. Open a Terminal and type:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install samba samba-common-bin

The download and installation process will start and it will take a while depending on your internet speed.

Create A Shared Directory

Now you need to create a shared directory that will be accessible by other PCs/mobiles connected to the same network. You can put it anywhere, but in this tutorial, it will be at the top level of the root file system of the Pi’s microSD card. Type the following command:

sudo mkdir -m 1777 /share

To help prevent the directory from being unintentionally deleted, the above command sets the sticky bit (1) and gives everyone read/write/execute (777) permissions on the shared directory.

Configure Samba

In this step, edit the smb.conf  file to configure Samba to share the selected directory and allow users to perform various actions like read, write etc. Open the smb.conf file using the following command:

sudo leafpad /etc/samba/smb.conf

You need to add the following entry:

[share]
Comment = Pi shared folder
Path = /share
Browseable = yes
Writeable = Yes
only guest = no
create mask = 0777
directory mask = 0777
Public = yes
Guest ok = yes
Configure Samba On Raspberry Pi
Configure Samba On Raspberry Pi

As per the above configuration, anyone can read, write, and execute files in the shared directory, either by logging in as a Samba user or as a guest. Just omit the guest ok = yes line if you don’t want to allow guests. To share a larger external hard disk, simply create a smb.conf entry for the path you want to share across the network (here the external hard disk).

Create A User & Start Samba

Everything is configured and now it’s time to create a user. To set up a password for the user, enter the following command:

sudo smbpasswd -a pi

Then set a password as prompted. It’s recommended that the password should be different from your Pi’s login password. Finally, restart the Samba and set it to start automatically when the Raspberry Pi starts up. Enter the following command:

sudo /etc/init.d/samba restart

Once you’ve made sure that you can locate your shared folder on the network, you can safely disconnect the mouse, monitor, and keyboard from your Pi and just leave it running as a headless file server.

5V to Dual 12V Step Up DC-DC Converter Using LM2588-ADJ

Lots of op-amp based circuits require dual (symmetrical) power supply. This tiny circuit is a simple solution which provides +/-12V DC 300mA from single 5AV DC   input. The board is based on LM2588-ADJ IC from Texas instruments. Step up from 5V to dual 12V is the best part of the circuit since 5V is easily available.

The LM2588-adj regulator IC specifically designed for fly back, step-up (boost) and forward converter applications, this regulator are cost effective and simple to use due to minimum number of external components.  The power switch is a 5A NPN device that can stand-off 65V. Protecting the power switch are current and thermal limiting circuits, and an adjustable frequency that can be programmed up to 200Khz. other feature include soft start mode to reduce in rush current during start up, and current mode control for improved rejection of input voltage and output load transient and cycle-by-cycle current limiting.

5V to Dual 12V Step Up DC-DC Converter Using LM2588-ADJ – [Link]

First Thoughts on the New ROCK64 Board

Alasdair Allan @ hackster.io writes:

The original Pine A64, hailed by many as a “Raspberry Pi killer” during its crowdfunding campaign, shipped to backers to somewhat poor reviews back in 2015. However after a lot of work by the manufacturer, software support for the board is now much improved. The recent release of the Pinebook by the same team, despite some initial teething problems, proved to be a solid product for the price. So the upcoming release of their new ROCK64 board could well prove rather interesting.

First Thoughts on the New ROCK64 Board – [Link]

Prosthetics Feeling Is Now Possible With This Implantable Chip By Imec

Imec, the world-leading research and innovation hub in nano-electronics and digital technology, announced last month its prototype implantable chip that aims to give patients more intuitive control over their arm prosthetics. The thin-silicon chip is said to be world’s first for electrode density. Creating a closed-loop system for future-generation haptic prosthetics technology is the aim of researchers.

What is special about this chip?

The already available prosthestics are efficient and have their own key features; like giving amputees the ability to move their artificial arm and hand to grasp and manipulate objects. This is done by reading out signals from the person’s muscles or peripheral nerves to control electromotors in the prosthesis. Good news is that revolutionary features are coming! The future prosthetics will provide amputees with rich sensory content. This can be done by delivering precise electrical patterns to the person’s peripheral nerves using implanted electrode interfaces.

The goal behind working on this new technique is to create a new peripheral nerve interfaces with greater channel count, electrode density, and information stability according to Rizwan Bashirullah, director of the University of Florida’s IMPRESS program (Implantable Multimodal Peripheral Recording and Stimulation System)

Fabricated amazingly in a small scale!

A prototype of ultrathin (35µm) chip with a biocompatible, hermetic and flexible packaging is now available. On its surface are 64 electrodes, with a possible extension to 128. This large amount of electrodes is used for fine-grained stimulation and recording. As the short video shows, the researchers will insert the package and attach it to a nerve bundle using an attached needle which will give better results compared to other solutions usually wrapped around nerve bundles.

“Our expertise in silicon neuro-interfaces made imec a natural fit for this project, where we have reached an important milestone for future-generation haptic prosthetics,” commented Dries Braeken, R&D manager and project manager of IMPRESS at imec. “These interfaces allow a much higher density of electrodes and greater flexibility in recording and stimulating than any other technology. With the completion of this prototype and the first phase of the project, we look forward to the next phase where we will make the prototype ready for long-term implanted testing.”

The Defense Advanced Research Projects Agency’s (DARPA) Biological Technologies Office sponserd this work of University of Florida researchers under the auspices of Dr. Doug Weber through the Space and Naval Warfare Systems Center. For more details about this topic check this article.

Meet Bean: The Ultimate Consumer SLA 3D Printer

Kudo3D Inc. is a startup company dedicated to bringing 3D printing technologies to consumers. It released the first generation 3D printer, the Titan 1, via a very successful Kickstarter campaign in 2014. Since then, they launched their second generation printers, the Titan 2 and Titan 2 HR. Now, they are releasing Bean 3D printer, the ultimate SLA printer for consumers.

Bean 3D printer  is a high resolution, affordable, and reliable resin SLA printer created with the consumer in mind. The quality  of resin printers with the affordability of FDM printers are the key features of Bean! The stylish 3D printer is green from inside and outside; its green cover makes it look so elegant and the embedded LEDs allow a greener energy consumption and longer lifetime. It is also affordable since the team had combined their PSP (passive self-peeling) technology with an ultra-high resolution LCD panel bringing the cost down.

This 3D printer has dimensions of 8 inch x 8 inch x 16 inch (20 cm x 20 cm x 40 cm) and  it weighs only 15 pounds (6.67 Kg), thus the Bean fits well in any office, studio and workshop environment. Bean can print at 50 micron XY resolution (capable of 10 microns Z layer thickness) with a maximum printing area of 2.7 inch x 4.7 inch (12.1 cm x 6.8 cm) and a build height of 5.9 inch (15 cm).
Jewelry printed by Bean

What is special about this 3D printer?

“Instead of using laser or DLP to generate patterns, the Bean has a high resolution 2K LCD panel coupled with a purple 405nm LED lamp to project slices of a 3D model onto the floor of resin container. The average power consumption of the Bean is only 50W which is one of the lowest.”
They developed a special 3DSR high resolution resins and have thoroughly formulated them for different applications.
You can get your own Bean now from the outstanding Kickstarter campaign for $399 including a 250mL bottle of resin, a resin container and a starter kit.
The campaign still has 29 days to go and it has already achieved 883% of its funds! Check out the campaign video here.