I added a couple more lights so you could see the effect better. I still have one output that isn’t being used yet. Also I added a couple of ways to vary the delays in the chase sequence. The first was a Potentiometer, the second was a Sharp Infrared Ranger. I am using the value from the ranger to determine the amount of delay in the chase sequence. You could also take the range value and break it down into windows and turn on individual outputs based on how close you are to the ranger. Here is a video of the Ir setup controling the delay.
Infrared Ranging ACLoads 12 Meg download.
Here are a couple more pictures:
I think I have about 500 of these assemblies that have the 4 output board and an intel 87C51 Processor.
I am not sure how many of the 8 output boards I have but it is in the hundreds as well.
Another note, It is possible to control 220v devices with these boards as well. The 4 outputs are paired so that you can provide a seperate line voltage to each pair. Here is the PDF file for the Triac’s that are used on the board. datasheet