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18 Jun 2011

Jersagfast writes –

I always have loved Apple and their non-jerky, fluid like GUI in all of their OS’s. Then I noticed it even with their hardware when I got my MacBook Pro over 3 years ago. My older PC’s always had a flashing sleep LED. That was fine until I saw the “breathing” LED pattern that Apple did on the Mac products. Much nicer. I saw these awesome cufflinks with the same “breathing” pattern, and got inspired to write a little Arduino sketch to replicate it. So I did.

“Breathing” Sleep LED – Arduino cufflinks :) [Link]


16 Jun 2011

adafruit.com writes:

Open source electronic cufflinks, pulsate like Apple Macs – a very last minute ultimate geek gift for Father’s day (order for overnight shipping if you want them on Friday!).

We designed these little cufflinks that subtlety pulsated like a Mac. We wanted something that was futuristic but still classy enough to wear for special events when we need to get dressed up. There will be a necklace version too of course.

Open source electronic cufflinks “pulsate” like Apple Macs – [Link]

16 Jun 2011

Squonk writes: [via]

Here is an interesting paper on “Very Low-Cost Sensing and Communication Using Bidirectional LEDs”. Not new (2003), but this technical report is very detailed.

The abstract to the document by Mitsubishi Electric states: “A novel microprocessor interface circuit is described which can alternately emit and detect light using only an LED, two digital I/O pins and a single current limiting resistor.”

App note: very low-cost sensing and communication using bidirectional LEDs – [Link]

15 Jun 2011

Forrest M. Mims III posts this quick and easy project on Jameco’s website demonstrating how to make a simple two-way opto-isolator using two LEDs. [via]

Quick and easy two-way opto-isolator – [Link]

15 Jun 2011

dangerousprototypes.com writes:

Dmitry Grinberg had a few PIC12F1840 MCUs lying around, and wanted to use them in some type of IR remote control project. He decided to construct a remote control mood light using the PICs in both transmitter and receiver. Four high-brightness LEDs (White, Red, Green, and Blue) are used to combine to form different colors in the receiver unit housed in a jar, along with a 38 kHz IR receiver module. The commands are generated by a PIC (housed in a gutted remote control housing) and transmitted via IR LED.

Remote control mood light – [Link]

9 Jun 2011

andyk75 writes:

You know it, in the winter time it is hard to get up, because it is dark outside and your body just won’t wake up in the middle of the night. So you can buy an alarm-clock that wakes you up with light. These devices are not as expensive as few years ago, but most of them look really ugly.
On the other hand, most of the time it is also dark when you come home from work. So the great sunset is also gone. Wintertime seems sad, isn’t it?

But not for the readers of this instructable. It explains you how to build a combined sunrise and sunset-lamp from a picaxe microcontroller, some LEDs and a few other parts.

A sunrise and sunset lamp with LEDs – [Link]

9 Jun 2011

theledart.com writes:

Just finished assembling Aurora 9×18. Based on the prototype aurora 9, this unit has 18 tri-color LEDs in each of 9 circles.
Because of the number of components (162 LEDs), assembly was quite a chore. Tri-color LED has pins that are close together, very narrow for a through-hole component. Solder bridging can happen very easily. (I’ve been soldering for over 30 years now, and thought I had good enough skill to get through the soldering, but I had a bit of a struggle…)

LED Aurora 9×18 – [Link]

8 Jun 2011

tinkeringetc.blogspot.com writes:

My first electronics project of the summer is now finished. Overall, it didn’t take me too long to complete, and I’m very pleased with the results. Watch this video overview and check after the break for all the juicy details.

Linksys LED Matrix – [Link]

8 Jun 2011

dangerousprototypes.com writes:

Siliconfish used to build IR cameras for a living, so he knows something about the effects light of various IR wavelengths can have on a camera. When his town installed photo cameras on the traffic lights, he decided to experiment with an array of IR LEDs mounted on a license plate frame to see what effect this would have on traffic light cameras. He presents his project details here for educational and research purposes only.

IR LED speed camera license plate blocker – [Link]

8 Jun 2011

Micrel has announced the availability of the MIC4811 High Current 6 Channel Linear WLED Driver with DAM™ and Ultra Fast PWM™ Control.

The MIC4811/MIC4812 are high efficiency linear White LED (WLED) drivers designed to drive up to six high current WLEDs for signage lighting. The MIC4811/MIC4812 provide the highest possible efficiency at low source voltages as this architecture has no switching losses present in traditional charge pumps or inductive boost circuits. These linear drivers maintain constant current for up to six WLEDs and feature a typical dropout of 100mV at 50mA (MIC4811) and 190mV at 100mA (MIC4812).

The MIC4811/MIC4812 feature Dynamic Average Matching™ (DAM™) which is specifically designed to provide optimum matching across all WLEDs.

The datasheet and evaluation board schematic can be found on the Micrel website.

MIC4811: High Current 6 Channel Linear WLED Driver with DAM™ and Ultra Fast PWM™ Control – [Link]





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