What a great thread! Many thanks to ccs_hello, who is now officially on my list of Cloudy Nights Heroes. I am happy to report that I have read the entire thread - every post over six years and eight pages.
I came across this thread because I want to take the next step with my trusty ol' Nikon D5000 and move from an intervalometer to Backyard Nikon. I'd like to try my hand at constructing the cable that is the topic of this thread, but I want to confirm one thing before I dive in:
Can the serial/USB dongle be connected to a USB hub, or must it be connected directly to a USB port on my laptop?
I'd like to connect the shutter control and USB data ports on my imaging camera (the Nikon) as well as the data port on my guide camera all to a USB hub, and then to run that to the laptop with a single USB cable.
Well, it seems that this thread is official comatose - no responses at all. When I found that many of the parts I'd need to buy are available only in bulk - so that I'd have to spend $10 to get 500 two cent resistors when I need one, for example - the total cost started approaching that of the DSUSB cable from Shoestring Astronomy. So ... I just bit the bullet and bought theirs. Oh, well.