Bruce, unlike others who have responded to your question, I am definitely 
not an expert. However, I have recently developed my own real-time display 
using the crt service, and it works very well for my purposes. The only 
catch is that some of the fields in the realtime.txt file do not contain 
real-time data. For instance, field 10, "rain today" has to be calculated 
by Weewx, so it is only updated once every archive period.

I know this is not your choice, but it may be worth considering, if other 
options prove too difficult.

On Wednesday, May 16, 2018 at 11:03:24 AM UTC-4, Bruce Huddleston wrote:
> I have an Airmar 150WX station that I finally got working with Weewx. It 
> was a challenge. The problem I have is that I need the updates to my 
> display to occur every 5-10 seconds. I can set the LOOP records to be 
> generated at any interval I want and it is set at 3 seconds currently. I 
> have tried to adjust the archive interval in weewx.conf lower than 60 
> seconds but if I do it gives a divide by zero error which I believe is a 
> known issue.
> My question is, is there a way to create an archive record every 5-10 
> seconds without resorting to using one of the realtime file creation 
> schemes like clientraw or crt? I've looked at those extensions but I can't 
> quite wrap my head around how they would generate a file that I could use 
> with my template. I would be happy to provide my config files and template 
> if someone is willing to help.

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