This project is a LED flower that uses PWM controlled RGB Leds which get their settings via USB using obdev.at’s USB stack. The controller board hosts an ATmega88 microcontroller which is running the V-USB stack so that it is controlled by a computer USB port. There is a total of 6 RGB Leds connected on the board using enamel wire. You can find construction details, schematic and software on the link below. [via]
LED Flower – [Link]
This project is a multicolored LED light based on CD4093. Adjusting the brightness of each group is provided by a generator whose frequency is fixed but whose duty cycle (temporal relationship between high and low) is variable. It consists of a fixed frequency oscillator and variable duty cycle for each of three colors. Each oscillator operates independently, which helps determine the degree of brightness of each red, green and blue.
Multicolored LED with CD4093 - [Link]
Mauricio Martins modified an acrylic Christmas tree by adding some LEDs controlled by a simple circuit. For this hack, he used the following components that you can buy for less than 8 euros:
- MUJI Red Acrylic Christmas Tree
- Resistors: 10k, 470k
- Capacitor: 0.1µF
- Integrated Circuit: 4060B
- LEDs × 18, 3mm diameter, any mix of colours: red, orange, amber, yellow or green
- Battery clip for 9V”
LED Christmas Tree – [Link]
This star is about 35cm across and designed to be displayed indoors in a window. It is based on 18F2620 that has more than enough memory (64K) so the author can add as many features as he want. Check schematic and code on the link below.
Animated Christmas Star - [Link]
Grenadier was trying to make a diode from a piece of silicon carbide that he had laying around but he noticed a faint glow. Investigating this further he found that one of the largest crystals emitted quite a lot of light over an amazingly large area. Using a particular crystal and some pins he managed to make a glowing LED. [via]
Homemade LED – [Link]
Bill Porter build a LED lighthouse based on ATtiny85. The unit is build on a custom PCB and he had made the beam spin effect using PWM to dim the LED light. In that way the light seems to rotate. Check construction details, schematics and PCB on the link below.
LED lighthouse - [Link]
Cree’s new XLamp® CXA20 LED array is the first lighting-class array aimed at accelerating the LED lighting revolution and can enable a 60-watt A-lamp equivalent while consuming just 11 watts.
LED array delivers record 1050 lumens at 11 watts – [Link]
This project is a POV display on a bicycle wheel based on Atmel ATTiny861 microcontroller to control 48 LEDs. There are 24 LED on each side. The LEDs are controlled from a series of 74×373 ICs connected to an 8 bit bus on the microcontroller. [via]
Bicycle Persistence of Vision Light Display - [Link]