LED matrices are a popular mean of displaying text, graphics, and animated information at gas stations, convenient stores, and many other public places. Raj’s new project is about making a Bluetooth-enabled 8×64 LED matrix display, where you can send the text messages through a smartphone over a Bluetooth connection. He used Arduino as the main controller and an HC-06 Bluetooth adapter to receive data from the smartphone. He has shared all of his design files and Arduino firmware on his blog.
DIY LED Matrix Display with Bluetooth support - [Link]
Many homes in the United States have water that contains higher concentrations of dissolved minerals, which is called hard water. Although there is nothing toxic about hard water, it is less desirable for cleaning, it leaves mineral deposits, and it can shorten the lifetime or efficiency of equipment such as water heaters.
A water softener is a household appliance that commonly exchanges salt for some of the dissolved minerals, resulting in softer water. The salt supply is stored in a brine tank and must be refilled every month or so. If you forget to refill the tank, the water softener is rendered temporarily ineffective.
Water Softener LED Display - [Link]
by Dario Borghino @ gizmag.com:
Researchers at Tohoku University in Japan have developed a new low-cost flat panel light source that could pioneer a new generation of brighter, cheaper and greener lighting devices to rival LEDs. The device uses arrays of highly conductive carbon nanotubes to deliver evenly-distributed illumination with high efficiency and a power consumption as low as 0.1 Watts – about 100 times lower than that of light-emitting diodes.
Cheap, ultra low-power light source runs on just 0.1 Watts - [Link]
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]
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]
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.
American and 2 Japanese Physicists Share Nobel for Work on LED Lights - [Link]
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]
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]
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]
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:
Prolong the short days with a Wago autumn special offer - [Link]