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30 Mar 2015

Qduino

by elektor.com:

Quin Etnyre has been into all things Arduino since he was a kid. He already has 28 Instructables published, founded his own company called Qtechknow in 2012 which sells ArduSensors and a line of fun and educational kits and oh, he is still just 14 years old.

His latest Arduino-based design is the Qduino Mini which is the first tiny Arduino compatible board to incorporate a battery charger and fuel gauge to let you know when the battery needs recharging.

The Qduino Mini is 1 inch by 1.5 inches and weighs just 5 grams which makes it ideal for use on airborne projects such as quadcopters, drones or high altitude balloons.

Main features of the Qduino Mini:

ATmega32U4 Processor – Arduino Leonardo compatible
32 KB Flash storage
2.5 KB SRAM
1KB EEPROM
3.3 V @ 8 MHz
20 digital I/O // 14 dedicated
12 analog Channels // 6 dedicated
7 digital I/O also PWM channels
SPI, I2C, UART available
LED Indicators for: ON, charge status, TX, RX, D13
TPS78233 3.3 V 150 mA regulator
MCP73832 LiPo battery charger
MAX17048 LiPo battery fuel gauge

The Qduino Mini – [Link]

30 Mar 2015

dream-1

Eco-Inspired 32-bit microcontroller chip for Wearables and the Internet-of-Things.

DREAM-1 is a Next-Generation, Eco-Inspired 32-bit microcontroller chip for Wearables and the Internet-of-Things;
No limitations – powered by Eco-Logic technology: minimal energy, maximum speed, event-driven, instantaneously responsive and energy-performance adaptive;
Fully compatible – DREAM-1 apps can be developed with existing software flows, programming languages and configured wirelessly over Bluetooth;
Exclusive – limited sampling batch only available on Kickstarter to perfect its design.

32-bit Microcontroller Chip – Next-Generation, Eco-Inspired – [Link]

28 Mar 2015

The most often requested video! In this tutorial Dave explains what Operational Amplifiers (OpAmps) are and how they work. The concepts of negative feedback, open loop gain, virtual grounds and opamp action. The comparator, the buffer, the inverting and non-inverting amplifiers, the differential amplifier, and the integrator circuit configurations are also explained.
Then a practical breadboard circuit to demonstrate a virtual ground and the effect of voltage rail limitations.

OpAmps Tutorial – What is an Operational Amplifier? – [Link]

28 Mar 2015

Keithley 2460 Source Measure Unit (SMU) Review, Teardown and Experiments – [Link]


27 Mar 2015

Fig_2_Eng

TCS3490 intelligent color sensor’s accurate measurement of color temperature and ambient light intensity enables sophisticated display color management control for smartphones, tablets, notebooks and digital still cameras

ams AG released the TCS3490, a color sensor for portable devices which is ideally suited for light source detection when operating under a wide range of light sources.
Providing accurate color and light intensity measurements, the TCS3490 enables designers of portable devices such as smartphones and tablets to implement more sophisticated display management and brightness control.

This integrated five-channel color sensor has extremely accurate measurements of the Correlated Color Temperature (CCT) of light. As sensors continue to proliferate in today’s mobile electronics market, manufacturers of mobile devices such as smartphones, tablets and laptops can use these measurements to dynamically adapt the display’s color palette to provide the user with a superior viewing experience.

AMS color sensor for mobile devices improves accuracy and offers new light source detection capability – [Link]

27 Mar 2015

obr1543_1

To tell the truth, probably no, but we have for you a few hints for relays which are very close to an ideal.

Signal relay is almost an „ideal component“ thanks to a practically zero distortion and a total isolation of a switched signal from a control one. That is naturally one of the main features of all electromechanical relays, but at signal relays it´s especially valued, as we usually require switching of relatively small signals. Favorite and widely used are for example relays Fujitsu series B3 and B4 (miniature SMT and THT relays) and series AxW (miniature only 5mm high relay) – all with bifurcated gold-plated contacts for a high reliability.

A novelty in our portfolio is the series Fujitsu NA representing something like a “golden middle way “. With dimensions 7,4×14,9×9,7 mm it belongs to narrow miniature relay enabling a high density of components on a PCB. Even though relay NA is somewhat bigger than for example series B4, but it´s able to withstand higher AC current – up to 0.5A/125VAC (vs. 0.3A at series B4) and it also provides an extreme mechanical lifetime up to 100×106 , what´s approximately twice that of B4 series. Sensitive coils, with a consumption of 0.1-0.3W at majority of types enable a dense mounting without problems with overheating.

From the point of view of the lowest possible consumption are naturally the best latching relays (with a permanent magnet) controlled only by pulses. Usually they´re easy to recognize by a letter „L“ behind the series marking (for example NAL, JSL). In a Fujitsu signal relays overview and the Fujitsu catalogue can be easily found a comparison among particular types as well as detailed information about them. We try to keep the most favorite types always on stock, what´s also reflected in the substantial increasing of stock.


Does a universal signal relay exist? – [Link]

27 Mar 2015

UHVCVD-2

by R. Colin Johnson @ eetimes.com:

PORTLAND, Oregon — Scientists trying to fulfill the 80-year-old dream of Nobel laureate Eugene Wigner, recently discovered how to place crystalline lattices of pure electrons in the bottom of a silicon-encased quantum well. The resulting material promises electron mobility more than 200 times greater than that of graphene and more than 1,700 times that of crystalline silicon.

So far, the work is still at the level of fundamental physics, but if researchers make the kind of advances they anticipate they could open a door to significant applications in semiconductors.

Scientists Pursue Super-Fast Material – [Link]

27 Mar 2015

pir_sensor

Motion sensing is the detection of the change in position of an object relative to its surroundings or vice versa. There are many kinds of motion detector methods: infrared, optics, radio frequency, sound, vibration, and magnetism. These methods differ from each other because each of them uses a different medium and detects different subject (e.g. sound: in Doppler effect, motion is detected by the change in reflected frequency).This project uses PIR (passive infrared) sensor to detect the change in radiation, this can be use on lighting control, temperature control, and motion detection since all objects with temperature above absolute zero emits heat energy in the form of radiation. The term passive refers to the fact that PIR devices do not generate or radiate any energy for detection purposes. It works entirely by detecting the energy given off by other objects.The D204B PIR sensor is used in this project, it contains a material that generates energy when exposed to heat/radiation. The MCP6H94 quad op-amp is used in two stages; amplifier and comparator. The weak signal from the PIR sensor will be amplified by the first two op-amp configured as amplifiers, the amplified signal is then fed to the last two op-amp configured as comparator. The BC548 NPN transistor acting as the switch will be triggered when the comparator’s output gets HIGH, further, switching the transistor will also trigger the relay that is connected to the load (light and/or alarm).

PIR Motion Sensor – [Link]

27 Mar 2015

IMG_1481

by Robert Gawron:

Kirlian photography is an interesting photographic technique of capturing corona discharge of objects. The images basically contain only edges in a form of blue glow. Note: one of those photos is visible in “The X files” intro – read the whole article to know why!

In this post I will present my minimalist approach with common materials and without complicated construction. The results aren’t that good as with more complex setups, but I think that they are still really interesting.

Kirlian photography – a simple way of taking it – [Link]

26 Mar 2015

obr1675_1

Silent operation, immunity against mechanical shocks and magnetic field and other factors make a solid state relay the best choice for many applications.

Where to start? We´ll try to name “pluses” of solid state relays – SSR:

  • long lifetime, no moving parts, no contact burning
  • silent operation, very desirable for commercial and medical applications
  • minimum electrical noise thanks to a possibility of zero-crossing switching
  • easy control (interfacing) and minimum energy consumption to control
  • resistance to shocks and vibrations, installation in any position
  • fast switching (approx. 0.1 ms)
  • low weight
  • immunity to outer magnetic field (usable near powerful motors,…)

Some disadvantage of SSR is, that they generate more heat when conducting a current through “contacts”, than classic EMR. But this is dependent on a switched current. On the other hand – power consumption of the SSR itself is minimal in comparison to EMR of a similar size.

From above mentioned features result, that SSRs are a great choice everywhere, where it´s necessary to switch frequently and/or also to change rotation of motors (integrated in a single component). SSRs are also maximally suitable for switching of DC currents (solar applications, batteries,…) as they don´t suffer by arcing and contact wearing like classic EMRs (DC arcing is much more difficult to extinguish than the AC one). Much longer lifetime in comparison to EMRs result in very low operation/ service costs and significantly eliminates losses caused by eventual downtimes.

If we allured you to SSR, than it´s certainly worth to take a look at products of a leading producer in this field – výrobky spoločnosti CRYDOM, which specializes for development and production of SSRs already for over 40 years. Among novelties in our stock can be found Crydom SSR for PCB in SIP and miniSIP packages, panel mount types, as well as types for a DIN-rail mount. Their basic features are very similar, they differ mainly in max. voltage and current, which they´re able to switch.

Practically each SSR Crydom is available for switching of AC or DC current and also in an “R” version (random switching in any phase of AC voltage) or „ZCD – zero crossing“ switching in “zero” (suitable for minimizing of switching noise).

Detailed specification can be found in the datasheets at jednotlivých typoch and a help at selecting will provide you documents Crydom overview, Crydom product guide, Crydom Selecting SSR and Crydom motion control. The „SSR-the inside story” document is intended for those of you, who like to understand components deeply.


CRYDOM – solid state relays from specialists – [Link]



 
 
 

 

 

 

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