Electroluminescent wire is a thin copper wire coated in a phosphor, which glows when an alternating current (100V) is applied. Unlike a LED strip it’s not a series of point but an unbroken line of visible light in all 360 degrees. The brightness of this technique is sufficient for the application and because of the very flexible nature of this material it can be easily incorporated in many different applications.
In this instructable I will explain how to apply fade effects to EL-Wire.
Step 1: Possible Techniques
Electroluminescent wire is not easily adjusted in brightness, therefore fading in and out is hard. Two main techniques are used to change the brightness of the electroluminescent wire, one is based on a custom build driver that actually shifts electroluminescent wire brightness by changing the alternating current frequency. The other is based on the same mechanism and uses a 555-timer component to change the current frequency, but this version is a lot simpler.
A problem with changing the frequency is the color change in the electroluminescent wire, above the 2000Hz the wire will quickly change to a lighter color, for example from dark blue to aqua blue. This behavior is not desirable in my application, but a slow fade effect to show the user the device is in progress is.
link to tutorial with 555-timer: http://hackaday.com/2011/07/13/color-changing-el-wire/