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22 Mar 2011

lincomatic writes:

Lampduino is a computer-controlled free-standing floor lamp, comprised of an 8×8 RGB LED matrix. The lamp stands 45″ high and 18″ wide. Light emanates from both sides. It has various display modes, as well as an included editor for creating animations. The lamp is controlled via an application running on a PC host. The display modes include realtime drawing, playback of previously created animations, snow, meteor, plasma, and synchronization with music. With its endless available colors, Lampduino can also be used for color therapy, or as a mood light. When running standalone, without a computer, it plays a soothing plasma simulation.

Lampduino – an 8×8 RGB Matrix Floor Lamp – [Link]

19 Mar 2011

rsdio writes: [via]

Why regulate the voltage from your supply when you really need a controlled current to drive an LED? Any regulator is less than 100% efficient, and the losses increase as more current is drawn. It looks like the circuit in this application note would allow you to skip the voltage regulator and thus avoid massive losses. You would still use a regulator for the µC part of the circuit where a steady voltage is needed, but the LEDs could be driven independently. Unfortunately, the circuit as shown has way too many parts, but I have a feeling that the basic idea can be used in a much smaller circuit after careful study. In the last several years, I’ve designed USB-powered boards with almost 200 LEDs, and I wish I had known about this technique to squeeze every last ounce of energy out of the limited 2.5 W USB supply.

This LED driver reference design drives a 700mA constant current to a single string of LEDs with forward voltages up to 60V. The design allows PWM dimming based on supply chopping. The input power supply is chopped on and off at 300Hz to 1kHz frequency to achieve LED brightness control. The driver uses a fixed-frequency boost converter, controlled by the MAX16834 LED driver. This unique reference design limits the input inrush current to negligible levels without compromising either the input or output filtering. Design schematics and test results are provided.

App note: MAX16834 high-power LED driver – [Link]

17 Mar 2011

txoof writes:

The Kindle 3 uses a screen technology that looks almost like glossy magazine print. What makes it remarkable and so easy to read is that it uses ambient light to illuminate the screen rather than a back light. The quality of the image is fantastic in normal reading conditions, but gets difficult to read in low light situations.

Kindle 3 DIY Light – [Link]

17 Mar 2011

hackhut.com writes:

Le Dominoux are “LED dominoes”, a blinking LED that propagates from device to device. Each Dominoux comprises a coin cell-powered 555 timer circuit configured as a one-shot, triggered either by a photo transistor or CdS photocell. Using a bunch of Dominoux enables creating various lighting patterns, trains, and continuous loops. Other Dominoux variants are the basic blinky for generating light pulses, and a tone generator for making annoying beeps.

Endless fun with LED dominoes – [Link]

17 Mar 2011

This is an old school circuit – I made it (with the help of a friend) in 1987, when I first started out in digital electronics. At the time there were no PCs – or at least not for the average person in Hungary. So all the planning was done in paper.

Programmable LED Lightshow from the 80s – [Link]

15 Mar 2011

MSP430 LaunchPad toolchain for Mac OS X: Breathing LED effect with the LaunchPad! [via]

Have you noticed how the blinking LED of the MacBooks causes a soothing, kind of hypnotic effect? No wonder why…

Apparently, the behavior of the LED while the computer is sleeping is tuned to resemble the human breathing rhythm at rest! Things like these give a better understanding of Apple’s meticulous attention to detail and how much of your MacBook’s $999 went into patent attorne– ALL GLORY TO THE BREATHING LED!

The breathing effect is a natural step forward from the dull and classic “hello world” blinking LED. If you want to add it to your project, you need a spare Timer and a few lines of code. Here is how…

MSP430 LaunchPad toolchain for Mac OS X: Breathing LED effect with the LaunchPad! – [Link]

14 Mar 2011

Big Dripper from Giles Hall on Vimeo.

Giles Hall writes:

Big Dripper is a robotic sculpture created by Giles Hall in 2011. It is a concept based on Harold Edgerton’s Piddler. Edgerton’s Piddler, also known as a “Time Fountain”, uses a stroboscopic light source to highlight individual drops of water in a constant stream of liquid. With the strobe off, the stream looks like a solid cylinder of falling water. With the strobe on, and correctly synchronized with the actuation of the pump, the individual drips of water that compose the stream are exposed.

Water droplet sculpture using LEDs and Arduino – [Link]

13 Mar 2011

makehackvoid.com writes:

The ASync-Firefly is an Analog Synchronising Firefly very heavily inspired by the Synchronising Firefly kit from Alex at Tinkerlog. I was inspired to see what it would take to replace the ATiny13 with common, off the shelf analog parts. My goals were to have no digital parts (which I failed at), using only through hole parts I could get from my local Jaycar (successful) and being able to use a single battery to run a string of kits (successful).

ASync-Firefly – [Link]

13 Mar 2011

semifluid.com writes:

This code is for a simple RGB LED controller for 1 RGB LED using a PIC12F675 (or PIC12F629). The pattern is determined by the data in the EEPROM. When the PIC needs a new target for the PWM, it loads it from EEPROM. Pin 4 (GP3) is pulled high because it is used to switch between displays. Please see the source code for more information; the structure and design is commented. The operation of the controller is very simple and so is the wiring.

PIC12F675 Single RGB LED Controller – [Link]

12 Mar 2011

An introduction to RGB LED driver reference design for a low-power projector. [via]

This application note is an RGB LED driver reference design for a low-power projector. The design features a single MAX16821 HB LED driver to drive the RGB LEDs one at a time. This approach reduces the components needed, resulting in an efficient, small, and economical design. Board layout and test results are shown.

App notes: RGB LED driver reference design – [Link]





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