This was really an exercise in learning to make a PCB (and after a few attempts it actually works)! I have been wanting to learn that for a long time. While it would be nice actually using the PCB and circuit someday, making my own signals to use the 5 wire set up seems like a large source of frustration as it's probably not feasible to make one's own traffic signals. Especially when the ones you listed above are so readily available and affordable. I think I even have some of those around here somewhere.
I wasn't aware of the over current conditions with the 4017 ICs? Thanks for pointing that out (I need to study the data sheets more closely). That's another good point that would probably need some thought. Also I don't have a source for the 2mm pitch terminals, the ones I got are from Digikey and were not outrageously priced, but not what I would call inexpensive like the 5mm ones either. I was trying to keep the PCB as small as possible. Must be from following GRJ's projects and the way he shrinks the PCBs down so well?
You read my mind on the 4 wire problem with the premade signals. I have been thinking about that since I started trying to create the PCB, with no solution in sight so far. It's a nice thought to change the circuit to work with the 4 wire signals, much more practical. However, not sure I have the know how to do that, if it's even possible. You are right about the off the shelf controllers being much better and easier to use, which I should probably just use for any layout projects, but taking this route I never would have learned to make a PCB.
If you have any thoughts on a better IC for the above project, or any ideas on using the 4 wire ready made signals with the my newly created PCB I'd love to hear about them. All the while I was working on this I suspected that it may never actually get used on a layout anywhere, but it was really a fun project and didn't cost a great deal. Only goofed up a couple of PCB orders and the components are not too expensive.
So, it's really not a big deal if my PCB ever gets used, it's been a great learning experience! At least now I can cobble together a simple PCB using Diptrace. Although with some difficulty using the included libraries of parts and patterns and getting them all to match the components being used. I think creating my own actual circuit is a ways off yet, but maybe someday?
Thanks for your input and any other comments you might have to add are most welcome.