This project is a LED based flare driven by a single PIC16F627A microcontroller. The C source code and construction details can be found on the site below.
LED Flare project based on PIC16F627A - [Link]
Making LED devices portable can be a little bulky due to the batteries. The Joule Thief solves that, by boosting a single AA battery’s voltage to a high enough level to light a LED. Check it out.
Joule Thief – use LEDs with only one AA battery! - [Link]
This instructable shows how to build your own rainbow LED strip based on PICAXE-08M microcontroller. The light strip consists of a flexible copper tape with very bright surface mount RGB LED’s and each pair of LED’s is controlled by an HL 1606. The instructable user “johncohn” has reverse engineered HL 1606 to find out the signaling required to drive the strips. The signal required was a SPI – Serial Peripheral Interface. Check the details on the link below. [via]
Rainbow LED Headband - [Link]
This project is basically a LED that is “breathing” – fading like the apple style effect and it is based on an ATtiny2313 microcontroller. It is powered from 3xAA batteries. The output signal comes out of OC1A, goes through the resistor, to the LED, and from there to ground. The source code is available for download here and It’s an avr-gcc source file.
A pumpkin that sleeps like a Mac – [Link]
Input Voltage: 10.5-16V DC
Input Current: 11-150mA at 12VDC
Resistor with 1K adjust brightness.
24 ohm resistor current max limit current to 20mA in each group of LEDs.
Dimable Led lamp - [Link]
This project is a big LED matrix controlled by Arduino board and build inside an IKEA table.
The displays are connected to the Arduino to share the row select pins (A,B,C and D) and the control lines EN, CLK & LATCH. The serial lines R1,R2,G1,G2 have their dedicated pins. So there are 19 pins needed out of possible 20 (not counting the reset pins as I/O). As the displays are loaded in 16 rows a 64bit some transformation has to be done while loading the display.
LED matrix Arduino IKEA Coffee table hack - [Link]
This project is a RGB led controller based on Attiny15L microcontroller. It is the easiest way to control a RGB Led. The software is written in Assembler. Timer 0 is used to generate interrupts at about 30kHz. This interrupts are used to build a 8bit PWM. Timer1 is used to change the color pattern.
tinyRGB: Attiny15L RGB Led controller – [Link]
This project shows how to turn a DC-DC converter to a constant current source able to power some LEDs. It uses the TPS54232 step down dc-dc converter and the author started by reading the SLVA374 app note from TI which is a Step-Down LED Driver Design Guide based on the TPS54160 dc-dc converter. Check details of this design on the link below.
TPS54232 constant current source - [Link]
This project shows how to build a multi node LED PWM Lamp Controller based on 12F609 microcontroller. Multiple lamps can be connected together to make large strings of light. The controller provides four full channels of PWM control
A Multi Node LED PWM Lamp - [Link]