My daughters who slept in the front bedroom said they could hear the relays that controlled the Merry Christmas going click, click, click, click, click, click.
Hmmm,  okay,  got the message, lets try and do something about it.

In the autumn I started looking at building a solid state interface.  I needed to find out what I could do with the ULN2803 Line Driver.  Could I drive the rope light directly from the Line Driver?  So, back to the internet and a search for ULN2803 revealed two things. 
     1 ) no, I can't drive the rope light direct.
     2 ) an  a w e s o m e  website.
w h o l e  website dedicated to controlling Christmas lights with computers !  WOW - computerchristmas.com  I spent the next two nights on this website looking at what other people had done with light displays and computers.  Yep, two whole evenings,  (poor wife).  Now I was seriously put to shame, I was only playing at Christmas lighting display compared to this lot.

Ah well, after that diversion I started replacing the relays going click, click, click, click, click, with opto isolators going . . . . .  on, off, on, off, on, off    (silently).

But as you can see from the photograph below, conspicuous by it's absence, I didn't complete it in time for Christmas.  Bar Humbug!

Sorted out my daughters though, there was no click, click, click, click, click, click
outside there bedroom window that year.
 

History Index

Messages from
     The Grinch (2011)
No Change
     (Dec. 2010)
Trees Grow !
     (Dec. 2009)
2008 Display
     (Dec. 2008)
Planning for 2008 !
     (Early 2008)
Here we go !
     (Nov. 2007)
The Big Change !!!
     (2007)
The Night Before
     Light-up (Dec. 2006)
The Tungsten Tree
     (Feb - Nov. 2006)
The Second move
     (Dec. 2005)
Who put that there ?
     (Aug. 2005)
Back in business
     (Dec. 2004)
Click Click Click
     (Dec. 2003)
Rope Lights
     (Dec. 2002)
The Move
     (Dec. 2001)
More Silicon Chips
     (Dec. 2000)
The Next Few Years
     & Chips
The Bug was biting
     (1993 on)
Early Married Life
     (1981 on)
A logical development
     (Dec. 1973 ish)
In the Beginning
     (Dec. 1962)