Tag Archives: sensors

Photografting: 3D Printing with Molecules

Researchers at TU Vienna have developed a special ‘photografting’ technique that allows molecules to be positioned in a 3D substrate to produce more versatile and accurate sensors for ‘lab on a chip’ devices. The researchers had previously explored new kinds of 3D printers, but 3D printing is not suitable for the envisaged applications because putting together materials from tiny components with different chemical properties is very complicated. Instead, they took the approach of starting with a three dimensional scaffold and attaching the desired molecules at exactly the right positions.

The process begins with a hydrogel with large pores through which molecules or even cells can migrate. Specifically selected molecules are introduced into the hydrogel mesh, and then certain points are blasted with a laser beam. This causes photochemical bonds to be broken where the focused laser beam is most intense, creating highly reactive intermediates that bond to the hydrogel in their vicinity very quickly. The precision depends on the laser’s lens system; the researchers were able to obtain a resolution of 4 µm.

Various molecules can be used, depending on the application. 3D photografting is useful not only for bio-engineering, but also for other fields, such as photovoltaics or sensor technology. It allows precise positioning, in very small spaces, of molecules that bond to specific chemical substances and allow them to be detected in a ‘lab on a chip’. [via]

Photografting: 3D Printing with Molecules – [Link]

Monnit Announces Global Frequencies Support for Wireless Sensors

Chicago Ill. – June 06, 2012 – Monnit Corporation (www.monnit.com) of Kaysville, Utah, announced today at Sensors Expo in Chicago the availability of wireless sensor hardware in both 868 MHz and 433 MHz ISM radio frequency bands. These radio frequencies are available in addition to the standard 900 MHz wireless sensor hardware released by Monnit in 2010. The availability of these additional radio frequencies ensures that Monnit wireless sensors can be used for global applications with the 868 MHz frequency band being primarily used in Europe, Middle East and Africa (EMEA) and 433 MHz frequency being used in Asia and South America.

“We have made our entire offering of wireless sensors, gateways and accessories available in 900, 868 and 433 MHz operating frequencies to address the immediate demands of our ever growing customer base. These additional radio frequencies allow our sensors to be used worldwide, while ensuring reliable low-power and long range operation.

NODE: a modular, handheld powerhouse of sensors


A modular device, NODE communicates with smartphones via Bluetooth. Bluetooth requires less energy than Wifi and can send information directly to your Bluetooth enabled device. With new Bluetooth Low Energy, NODE can communicate with iPhone 4S and some Android phones at up to 50 meters with even less energy than conventional Bluetooth. With multiple NODEs networked in your home or office, you can control the different devices by your location.

NODE: a modular, handheld powerhouse of sensors – [Link]

Breakout – Connect your Arduino sensors and actuators to javascript

Breakout – [via]

Breakout is a prototyping tool for exploring the intersection of the web and the physical world. The popular Arduino platform and the Firmata protocol are leveraged to enable users to access physical input and output purely from javascript. This makes it easy for anyone familiar with javascript and basic web development to explore the possibilities of using physical I/O in their web applications. Furthermore, the Breakout framework includes a growing library of hardware abstractions such as buttons, leds, servo motors, accelerometers, gyros, etc enabling the user to easily interface with a range of sensors and actuators using just a few lines of javascript code.

Breakout grew out of a need for a simple platform to enable designers to prototype functional web-based interfaces to the physical world. It is based largely on the Funnel toolkit and informed by the experiences of the developers of both Funnel and Breakout as designers, technologists and educators.

Breakout – Connect your Arduino sensors and actuators to javascript – [Link]

Door Activated LED Lighting using Hall Effect Sensors

woody1189 writes:

I’ve been meaning to make something cool for my dorm room this coming semester and decided that some custom closet lights would look great. In this Instructable, I’ll show you how to make some nice-looking LED lights that will turn on automatically using a hall effect sensor and a magnet.

Edit: I’ve noticed a lot of people are hating on the excessive control used in this project so I just wanted to clarify a few things:

  1. This instructable was also meant to be a lite introduction to actual AVR programming for those people who are used to only Arduino programming. I had a bit of trouble finding useful information when I was learning so I figured it would be nice to help out some others. That is why I posted the basic tutorials along with my AVR code.
  2. Yes I’m aware I could have simply used a reed switch to switch the LEDs when the door opened and closed. I wanted to leave room open for myself to add different light modes, maybe using more wires and pins to create nice fading effects, possibly a remote control sensor, and maybe even an auto-shutoff routine.

Door Activated LED Lighting using Hall Effect Sensors – [Link]

Disposable Biosensors Feature Molecular Detection

Imec and Genalyte have developed and produced a set of disposable silicon photonics biosensor chips for use in diagnostic and molecular detection equipment. The chips combine standard silicon photonic waveguide technology with bio-compatible modifications and were manufactured using standard microelectronic CMOS fabrication technology. The chips have been tested in the field and proven to meet the functional requirements with high yield.

The high integration level of silicon photonics on the chips enables extensive multiplexed biosensing. Each chip can contain up to 128 ring resonator sensors coated with application-specific chemicals to provide very sensitive molecular detection capability. [via]

Disposable Biosensors Feature Molecular Detection – [Link]

New sensors Sensirion will take you only 3x3mm on PCB!

Calibrated humidity and temperature sensors Sensirion SHT21, SHT25 and STS21 excel by very small dimensions. Thanks to their miniature size and a very low power consumption, you can use them even in small portable devices.

Sensors SHT21, SHT25 and STS21 with I2C digital output belong to the SHT product line, with the CMOSens technology of swiss company Sensirion. SHT21 and SHT25 measure relative humdity and temperature, STS21 measure only temperature. With a new CMOSens chip, reworked capacitive type humidity sensor and the improved band-gap temperature sensor they feature excellent properties. They have very similar and in some aspects even better properties than SHT1x and SHT7x sensors. Also these sensors belong to high quality CMOS sensors, which contain all elements of the measuring chain on one chip: humidity and temperature sensor, precise supply, low noise linear amplifier, AD converter and interface. Inspite of very compact dimensions also SHT21 and 25 sensors remain resolution of 12 bits for relative humidity and 14 bits for temperature. Temperature sensor STS21 has also a 14 bit resolution and a user can choose by a command the resolution of 14, 13, 12 or 11 bits.

I2C interface enables a very simple communication with a host microcontroller, in a Hold/ No Hold Master mode. Defaultly sensors have the same I2C adress set from production. Upon request it is possible to provide sensors with various adresses from producer. STS21 is fully compatible with SHT2x but it has a different I2C address. This enables to use sensor STS21 in applications where humidity measurment is optional and enables to use the same hardware.

New sensors Sensirion will take you only 3x3mm on PCB! – [Link]

Circuit Skills – Infrared Light

Circuit Skills – Infrared Light @ MAKE… [via]

Infrared light may be invisible to the human eye, but its usefulness in the world of electronics is easy to see. From simple object sensors to wireless data transmission, IR emitters and detectors can be used in a variety of different ways. And their low cost and wide availability makes them a great choice for enhancing an electronics project.

Circuit Skills – Infrared Light – [Link]

Temporary tattoos fitted with electronics make flexible, ultrathin sensors

Temporary tattoos fitted with electronics make flexible, ultrathin sensors. [via]

Modern methods of measuring the body’s activty, such as electroencephalography (EEG), electrocardiography (ECG), and electromyography (EMG), use electrical signals to measure changes in brain, heart, and muscle activity, respectively. Unfortunately, they rely on bulky and uncomfortable electrodes that are mounted using adhesive tape and conductive gel—or even needles. Because of this, these types of measurements are limited to research and hospital settings and typically used over short periods of time because the contacts can irritate skin.

These limitations may be at an end, however. New research published in Science describes technology that allows electrical measurements (and other measurements, such as temperature and strain) using ultra-thin polymers with embedded circuit elements. These devices connect to skin without adhesives, are practically unnoticeable, and can even be attached via temporary tattoo.

Temporary tattoos fitted with electronics make flexible, ultrathin sensors – [Link]