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20 Oct 2014

FFBU76WI1C1HERC.MEDIUM

by jollifactory @ instructables.com:

We have created two game project instructables so far using the jolliFactory Bi-color LED Matrix Driver Module D.I.Y kits we designed. This LED Matrix module is designed to be chain-able so you may daisy-chain the modules together to the number of modules you need to suit your project.

Arduino based Bi-color LED Matrix Pong Game - [Link]

11 Oct 2014

avoid_aluminum_capacitor_pitfalls_fig1

by Robert Kollman @ edn.com:

Aluminum electrolytic capacitors remain a popular choice in power supplies due to their low cost. However, they have limited life and are sensitive to both hot and cold temperature extremes.

Aluminum electrolytic capacitors are constructed with foils placed on opposite sides of paper saturated with an electrolyte. This electrolyte evaporates over the capacitor’s lifetime, altering its electrical properties. If the capacitor fails, it can be spectacular as pressure builds up in the capacitor, forcing it to vent a combustible and corrosive gas.

Avoid these common aluminum electrolytic capacitor pitfalls - [Link]

8 Oct 2014

adafruit_3668

by DENNIS OVERBYE @ nytimes.com:

Three physicists have been awarded the Nobel Prize for revolutionizing the way the world is lighted.

The 2014 physics award went to Isamu Akasaki and Hiroshi Amano of Japan and Shuji Nakamura of the University of California, Santa Barbara, for “the invention of efficient blue light-emitting diodes, which has enabled bright and energy-saving white light sources.”

The three scientists, working together and separately, found a way to produce blue light beams from semiconductors in the early 1990s. Others had produced red and green diodes, but without blue diodes, white light could not be produced, the Royal Swedish Academy of Sciences said on Tuesday morning in its prize citation.

[via]

American and 2 Japanese Physicists Share Nobel for Work on LED Lights - [Link]

2 Oct 2014

blackoutbuddyh2o

by By Ben Coxworth @ gizmag.com:

It’s the big paradox of emergency-use flashlights … by the time you eventually need to use them, their batteries have died. Eton’s new Blackout Buddy H2O, however, will reportedly still work after sitting for up to 10 years. And to turn it on, you just add water.

This latest member of the Blackout Buddy line has a magnesium-oxide battery, which starts delivering power to the light’s three LEDs when exposed to H2O. To initially fire it up, you dip it into a small cup of water, or pour water into its battery compartment. After that, it will keep going continuously for up to 72 hours – if it starts to dim within that time, you simply add more water.

Blackout Buddy H2O runs on water to provide emergency lighting - [Link]


1 Oct 2014

rcj_IBM_Graphene_Silicon_Wafer

nextgenlog.blogspot.com:

IBM has not only perfected a method of growing wafer scale graphene as a potential material for the post-silicon era, but has found a way to use it today to dramatically cut the cost of GaN LEDs.

IBM Grows Wafer Scale Graphene – [Link]

26 Sep 2014

princeton-led-efficiency-increase

by Colin Jeffrey @ gizmag.com:

With LEDs being the preferred long-lasting, low-energy method for replacing less efficient forms of lighting, their uptake has dramatically increased over the past few years. However, despite their luminous outputs having increased steadily over that time, they still fall behind more conventional forms of lighting in terms of brightness. Researchers at Princeton University claim to have come up with a way to change all that by using nanotechnology to increase the output of organic LEDs by 57 percent.

Breakthrough in LED construction increases efficiency by 57 percent - [Link]

25 Sep 2014

obr1585_1

Days get shorter but it doesn´t have to be a problem. At purchase of Wago terminal blocks it´s now possible to gain a quality portable LED lamp.

If we want to bring electric energy to same place, we´ll reach for cables. If we want to interconnect them, we´ll reach for Wago 2273 terminal blocks …

Also this way could be characterized well-known push-wire connectors Wago 2273, as they provide practically unrivalled simplicity of usage at interconnecting of wires in installation boxes. Similar situation is also with Wago TopJob S terminal blocks at installations in distribution boxes.

Wago autumn special offer this time brings a portable LED lamp myLUX Professional (230V, 900 lm, 6000K) with a Li-Ion rechargeable battery (exchangeable) – as a gift to the above mentioned connectors and terminal blocks. If you have 230V mains line available, the lamp works on 230VAC and recharges battery at the same time. At a power dropout or in places without electric energy a battery power can be used. Two sets will be available:

Wago Profi Set 1 – 2273 series – 100 pcs compact connectors 2273-202, 300 pcs 2273-203, 100 pcs 2273-204, 200 ks 2273-205 and 50 pcs 2273-208 + LED lamp. Sales price of this set is 109 Eur.

Wago Profi Set 2 – TopJob S – 50 pcs 2003-7641 – installation terminal block TopJob S, NT/L/PE, 4mm2, grey + LED lamp. Sales price of this set is 119 Eur.

Prolong the short days with a Wago autumn special offer - [Link]

24 Sep 2014

apa102-600x397

cpldcpu writes:

I contrast to the very timing-sensitive one-wire protocol of the WS2812, the APA102 uses a standard two wire SPI protocol – one clock line and one data line. Each LED has two inputs and two outputs which can be daisy chained. At the first sight this may seem wasteful, but it has the advantage of being supported by standard microcontroller periphery and it is insensitive to timing variations. Due to the critical timing requirement it is not possible to control the WS2812 from SOCs with multitasking operating systems, such as the Raspberry Pi. This should not be an issue with the APA102. Furthermore, the data can be transferred at an almost arbitrary clock rate. I was able to control the LEDs with 4 MHz SPI clock without any hitch. It appears that the maximum speed is mainly limited by the parasitics of the wiring.

[via]

APA102 aka “Superled” - [Link]

24 Sep 2014

FreqC-600x450

xristost blogged about the frequency counter module he made:

First of all I wanted a PIC microcontroller to do the whole job without any additional ICs. Also I wanted to use the the familiar 16F628A, but because one of the portA pins (RA5) can be used only as input I was short of outputs to do the job. Driving 6 digit 7-segment multiplexed display requires 7 + 6 = 13 outputs. The 16F628A has 16 IO pins, two of which are used for the crystal oscillator, one is for the signal input and other one can be used only for input, that leaves us with only 12 useful IO pins. The solution was to drive one of the common cathodes with a transistor, which opens when all other digits are switched off.

[via]

Frequency counter with PIC16F628A - [Link]

22 Sep 2014

pca964bbheader-600x145

Ondřej Karas of DoItWireless writes:

 If You are interested in LED driving through RF, this article would be interesting for you. I tested own PCA9634 breakout board for this chip and wrote simple low level driver for IQRF TR-52D module. Next week, I am going to publish PC application for comfortable operation with that.

[via]

Wireless LED driver with PCA9634 - [Link]



 
 
 

 

 

 

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