Traffic light project for Multisim

Hello, I am trying to design a working traffic light for both N/S and E/W sides of traffic (i.e., six lights). I will build it later, for real, using the Elvis II breadboard. I have been looking around at other schematics on the web, I have drawn many of these on Multisim and none of them work. It also needs to be a U.S. traffic light, as the ones in the U.K. are different. I have tried many different combinations, with the 555 timer and the 4017 decade counter, but I don't know how these components actually work. I need help. The simplest circuit would be better, I know, like some kind of RS flip-flop or JK flip-flop (?). I don't know how these components really hook up together or how I am supposed to get the timing right, where the red and green on opposite times will stay on for a required time, like 15 seconds for demo purposes, and then go to yellow on the side the green was on for 3 seconds ( after the green goes out and the red stays on with the yellow) and then it flip-flops to green and red on the other side for 15 seconds. I don't know how to go about this. A good example would be very helpful. Thank you, brett1405
Solved!
Go to Solution.

Hi -
I am trying to build the same type of circuit in Multisim and am unable to get any simulation to run. The error keeps saying my "timestep is too short", which I have no idea what that means... Do you have any suggestions? I wasn't able to find the sample circuit in my Multisim version for the traffic light either.
I have what looks like a mess of a circuit and I don't even know where to begin to trouble shoot it...
Attachments:
Final Circuit2.ms10 ‏266 KB

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