This application note discuss a Boost driver for long LED strings. [via]
The long strings of LEDs commonly found in TV and display backlighting, street lights, and parking garage lights require a current driver capable of producing high voltages. This reference design provides such a driver using the MAX16834, and demonstrates how very-high dimming ratios can be obtained.
Boost driver for long LED strings – [Link]
This project shows how to make blinking LEDs to music. It’s a simple project for anyone with some electronic skills. Plug this circuit into an audio source and the LEDs will blink to the rhythm of the music. The circuit is using the voltage from the audio input to activate a transistor and turn on the LEDs.
Blinking LEDs to Music - [Link]
Christmas is the festival of lights. There is a new project posted on embedded-lab.com that uses LEDs to display Christmas message. The individual letters of the message are created with 5 mm red LEDs and are controlled through a PIC 16F688 microcontroller. Something you would like to make for your Christmas decoration.
Christmas Message Display Board using LEDs - [Link]
The LoL Shield for Arduino is a charlieplexed LED matrix for the Arduino. All the LEDs are individually addressable, so you can use it to display anything in a 9×14 grid. Scroll text, play games, display images, or whatever else you want with the Lots of LEDs shield.
LoL (Lots of LEDs) Shield for Arduino – [Link]
This project shows how to build a PCB UV exposure box using UV LEDs and digital multifunction timer. Check details on the link below.
PCB Photographic Artwork Transfer UV Cabinet – [Link]
Jacques Lebrac build a UV LED exposure box using only one LED. The led used is a 5W unit, emits at 400 nm UV and needs 1.5A of current. As a heatsink he used an aluminum arm that also supports the LED on proper distance. A LM117 is used to regulate the power driving the LED. [via]
Single LED UV PCB exposure box - [Link]
Mike Shatohin build this LED Ambient lighting named AmbilightUSB. It uses a ATtiny44, 4 RGB leds, 74HC595 and USB connectivity. It is able to analyze the computer screen color information and reproduce the screen colors on the back of the screen. The software is cross-platform and can be run on Linux or Windows. Check schematic and details on the link below.
AmbilightUSB: Ambient lighting to your computer – [Link]