This is a control circuit that lights a LED array and then dims off using a transistor and 4 more simple components (resistors-capacitors). It is an extremely practical circuit. It can be used as a car dome off-delay light, or in your tent when you go camping, or even as a security light. It can be powered with any voltage from 4 to 15 volts, and it can control up to 78 high brightness LEDs @ 12V power supply (or 104 LEDs @ 15V).
LED Off Delay with dimming effect - [Link]
This project is a LED array PWM dimmer using 555 timer IC. The 555 timer IC is configured as a PWM generator. A potentiometer controls the charge and discharge times and thus the duty cycle of the PWM. As PWM duty cycle is varying the brightness of the led changes. Check schematic on the link below.
An LED Array PWM Dimmer with the 555 - [Link]
Tron Legacy Disc was gutted and the paltry 6 LEDs were removed and replaced with 30 individually addressable, high output blue LEDs. It is now also rechargeable with its modified base. For now, the Netduino is temporarily mounted in the center but will be replaced with a Netduino Mini. Also, there is an accelerometer mounted in the device, but has yet to be activated in the software. [via]
Complete Tron Legacy Disc Toy Rebuild – [Link]
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]