See if $last rather than $current helps (untested)

On Friday, December 3, 2021 at 2:53:22 PM UTC-8 [email protected] wrote:

> Hello,
> With lots of good help from the group, I have my Seeed CO2 monitor (LoRa) 
> sending data to my weewx.sdb archive. I have weewx 4.5.1 (setup.py) on 
> Focus Ubuntu.
>
> The sensor sends data only every 60 minutes and my archive update is 
> every15 minutes.
> Looking at weewx.sdb, I have a reading recorded every hour but a null 
> every 15 minutes when there is no new data.
>
> co2 column
> 417.0
> null
> null
> null
> 390.0
> null
> null
> null
> 394.0
>
> My settings in (Standard) index.html.tmpl are:
> Current Conditions
>       <td class="stats_label">CO2 level</td>
>       <td class="stats_data">$current.co2</td>
> Sometimes I get a data reading and others just "N/A"
>
> My settings in weewx.conf:
> [MQTTSubscribeService]
>     # Turn the service on and off.
>     enable = true    
>     binding = loop
>  [[[mytopic]]]
>     ignore = true
>  [[[[CO2_Value_PPM]]]]
>      name = co2
>      ignore = false
>      contains total = false
>      conversion type = float
>
> Since everything seems to be working, the "$current.co2" may not be the 
> correct form to use here as the display needs to retain the last value 
> until it's replaced with a new reading coming every 60 minutes from the 
> sensor.
>
> Much appreciated if someone could point out my mistake in configuration 
> here.
> The display can be seen at: http://grattans.org/wx
>
> Cheers,
> Bob
>

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