Hi all. Well had a little health issues, but back to work.
At this time, the Turntable is done. It is fully functional and ready to demo. However, we have also been working on a drawbridge and the control logic is still in work. When that is done, we will back a video of both in operation and post on youtube (since it will be a long-and too large-video). At that time I will post a link.
In the mean time to use my existing parts, I need some help (probably from Stan). I am using the optical sensor approach to stop trains from running off the table if the bridge is not down. However, the 2-channel relays I have require a LOW to trigger. The circuit I used (Stan's design) incorporated a transistor to provide the additional drive to trigger the 1-channel relays I was using. They required a HIGH to trigger. What I need is a simple inverter or circuit change to get a LOW trigger when the beam is broken. I have enclosed a schematic of the circuit I use with the 1-channel, HIGH trigger relays.
