Blog Archives
Posted on 02 Apr 2008
Miniature fires that flicker create the sense that someone is nearby in a model scene. They can add a moving effect to a dolls’ house, model railroad or Christmas Village scene.This fire will be created using a set of LED’s especially for the purpose of fire from Evans Design. As this fire is going to be part of a portable table display, a 9 volt battery will be used to power the LED’s which in this case are designed for DC (direct current) use.[more]
Posted on 01 Apr 2008
If you want to learn how to control RGBLED this is the right website that you should to visit.Here is the sumary about this website “The RGBLED and mRGBLED controllers allow you to control the color of RGBLEDs. This might sound trivial, but it actually takes a lot of resources to let you be able to set an RGBLED to any color you’d like. In addition to just lighting an LED up with a given color, these boards also let you install a color or setup transition/animations effects. They are easily controller via an RS232 connection (serial port) or an SPI connection (logic level).The boards can be built reasonably inexpensively and there are PC boards available for either model. All source code for the onboard PIC processor as well as the software for configuring and using the controllers is available. The protocol is a simple protocol well documented.”[more]
Posted on 01 Apr 2008
This is a 560 LED matrix display designed by cadstarsucks a member on linear1.org forum.He said:”"Here is one that I did at work, though I think this project died. It might be useful as a matrix sticky. I have lit more LEDs at once before but this one is a bi-color matrix so it fits more with this topic.5×7x2×8=560 LEDs driven by a crumby little 8 bitter. 7 74ABT574s provide the row drive and 10 column transistors with the whole display refreshed 100 times a second.[more]
Posted on 13 Mar 2008
This is an improved version of Mitch Altman’s Brain Machine.The hardware is based on an ATMega8.It uses only very few of the I/O ports: two for audio, two for LEDs, one for a pushbutton, so it should be easy to use another controller that has an 8bit timer with two PWM channels (OCxA, OCxB).Add a piece of prototyping PCB, four capacitors, two resistors, a switch, connectors for headphones and glasses, and two AA cells, and you’re done.[more]
Posted on 10 Mar 2008
In this flashlight, each LED/resistor combination consumes 4.5volts at 30mA or about 135mWatts. The ballast resistor alone consumes 1.1volts at 30mA or about 33mWatts. Therefore, 25% of the power being drained from the batteries is lost in the resistor of each LED chain.[more]
