What do you do about a night-light that has to stay on while your child falls asleep, and you don’t want to have to go in and turn it off every night? Buy a timer? No, that’s not fun.
The solution: teach her something! So we repurposed an old broken desk lamp carcass, I taught her how to solder, programmed a 12f629 PIC and we combined the above with sufficiently many white LEDs and some recycled laptop Li-Ion cells into an auto-off bed light: Press the button when off, and you get 18 min of light. Press the button when the light is on, and the light goes off. Simple, neat, efficient. As a bonus the lamp body is black, Just Like It Should Be. [via]
Simple night-light timer - [Link]
This is a clock with a big display unit, that has a DCF77 (german timesignal) Receiver and can be connected to an ethernet network, where it can serve as a NTP server. All of this based on an Atmel AVR microcontroller with 8 KB flash.
NTP DCF77 LED Clock - [Link]
This LED Bike Light System can be made to be just a headlight or both a headlight/taillight bike light.The circuit use simple electronic components such as LM555,PNP Transistor (2N3906),NPN Transistor (2N2222) plus some resistors and capacitors.
LED Bike Light System - [Link]
This instructable shows how to wire up one or more LEDs in a in a basic and clear way. Never done any work before with LEDs and don’t know how to use them? If you have wired up LEDs before, this explanation might seem overly simplistic. Consider yourself warned.
LEDs for Beginners - [Link]
Chipwich writes -
“I had a few multicolor LEDs laying around and wanted to whip up a color-blending nightlight. I built 2 devices, each in its own 20 pin DIP socket without soldering. A 3-pin header is included so I can reprogram the light on-the-fly if desired. On my first build, I used wire-wrap. The next one used multiple wires pushed into the socket. A bit more difficult, but no wire-wrapping or soldering necessary.” -
Picaxe Blending Nightlight - [Link]
LEDLoad is a device and software designed to display many shades of colors from green to red on your computer case LED. Colors are controlled completely by software and can be updated in real-time. The LEDLoad circuit board is connected to one of the internal USB ports found on most newer motherboards. The only actual case modification required is in replacing the two (or more) front panel LEDs with tri-color versions. These are then connected to the LEDLoad circuit board.
LEDLoad - [Link]
The Cubatron was the world’s largest true 3D color graphics display from 2004-2006 (now overtaken by the Big Round Cubatron). It is 8×8×8 feet in size. It consists of 729 voxels (3D pixels) arranged in a 9×9×9 matrix, spaced 10 inches apart from each other. Each voxel is a 40mm diameter ball that can be independently set to display a 21-bit RGB color. The entire display can be updated about 30 times per second. The voxels “float” in space so that the viewer can see through the cube and have a view of most of the voxels from any position.The voxel driver board has a PIC18F452 which demuxes the incoming data and sends it out to the 27 voxel strings while maintaining proper timing for the synchronous protocol. Each voxel has an RGB LED on it that is controlled by a PIC12F629 microcontroller.
The Cubatron - [Link]
If you want to make your own Luxeon Led flashlight then this is an ideal circuit to power your led. Circuit controls the led in three button presses. On 4th press the led goes off. At sleep mode the circuit consumes only 1,2u A. The board is small so it can be easily integrated on a flash light.
Luxeon LED dimmer - [Link]
This is small blinking LED demo application for LPC2103 Olimex board. Project compilation was made under Linux by using GCC tools and debugged openOCD debugging software.
Benedikt Sauter describes the process of building project with arm-elf-gcc and debugging with openOCD via JTAG interface. Follow these steps and you will make your first ARM7 project under Linux. Necessary project files can be downloaded here. [via]
Blinking LED with LPC2103 under Linux - [Link]
This is cool project to pay attention to. It can be used for PC modding or elsewhere where scrolling text effects are needed. Display is built of 50×7 LEDs that is controlled by AVR AT90S2313 microcontroller (may be substituted by ATtiny2313).
Text can be sent from computer via RS232 port or displayed from external EEPROM 2k memory where 768 characters can be stored. Fonts set of 256 different characters can also be programmed and mast be written to EEPROM before sending text to display. Hardware project with 3mm LEDs can be downloaded here. And latest firmware here. There might be minor changes are needed to adapt to newer WinAVR and ATtiny2313 microcontroller. [via]
Scrolling text effect on a LED matrix display - [Link]