EL Wire

A page for discussion of EL Wire and in particular microcontroller controled EL wire.

This is an early draft... add to it please.

Some Questions an Answers about EL Wire

Question 1: If a driver says it is for "50-100 feet" or "20-100 feet", is it a problem to drive only 5 feet of ElWire with it?

It seems to be believed that runing a driver with too little load can damage it. A possible solution is to use a capicator ( EL wire behaves as a capicator ) as a dummy load to be switched on when the length of wire dirven is too short.

Question 2: I thought I read somewhere that there was a problem with running an ElWire inverter with no ElWire attached.

No EL Wire is the same as 0 feet so see question 1.

Question 3: Does anyone know if ElWire responds well to attempts to control its brightness by Pulse Width Modulation of the power being applied to it?

Probably. The lower the freqency the the more we can be sure of it. The blending is done in the eye, 24 Hz is normal for movies, so this or faster might be a good starting point. Motion can make the modulation more obvious, so a frequency somewhat higher might be better. Need the frequency to be low enough so the width can be controlled accurately and to leave computation cycles for the controller. You should also be aware of the frequency of the AC used to activate the wire, clearly the pulse witdth should be long enough for a few cycles of this voltage to be applied to the el wire at the dim end of the range.

Question 4: A microcontroller can switch only about 5 volts, how can it control the over 100 v used by EL Wire.

Seems like the popular answer is to use a triac, driven through an optical isolator if you think the mc needs a lot of protection.

EL Wire Links

There is not much on the web about microcontroller control of EL wire, so far I have found one useful link.

• Make a Glowing, Wearable, EL-Wire, Blinky Light Using Open Source Tools

• SpeedVest

• Russ Hensel's EL Wire Project