All you can add to the $hour tag is an offset in hours ($hours_ago) but all this does is offset the one hour window, you will still likely see missing data as the window is still exactly one hour.
Did you try my earlier suggestion to try $span with a slightly longer than one hour span? This increases the window beyond one hour. Gary On Tuesday, 7 December 2021 at 01:38:47 UTC+10 [email protected] wrote: > Ok, I seem to have jumped the gun :( > > Things are much better but I'm still getting the N/A in place of data > every few archive records (current data). My suspicion here is that the > sensor is not sending on exactly 60 minute intervals. Looking at the actual > times in the LoRa server, it's 60, 61 or 62 minute intervals--not always > the same. Is it possible, using the basic " $hour.co2.last" syntax, to > change the "hour" to say 65 minutes? This would probably catch the changes > from one hour. I have attached a file of what is in the weewx.sdb showing > the missing data in certain instances. If the sensor has updated just after > the archive time (15 minutes) then it misses recording new data. > I'm just guessing here at what might be going on. The graph seems to be > picking up the data with no problem. > Thanks. > Bob[image: zbsng7lr.bmp] > > On Sunday, December 5, 2021 at 12:41:03 PM UTC-5 [email protected] wrote: > >> It looks like " $hour.co2.last" did it, at least the last four hours are >> updating correctly with no N/As mixed in. >> >> Many thanks to all who contributed help on this, and much appreciated is >> all the hard work that goes into weewx maintenance and updates by many! >> Bob >> http://grattans.org/wx >> >> On Sunday, December 5, 2021 at 8:10:12 AM UTC-5 [email protected] wrote: >> >>> I'd go with Tom's advice, but if you want to get the cache working I'd >>> need a log file with debug set to 2. It needs to have a few archive records >>> before the first CO2 reading arrives via MQTT and a few records after. >>> Warning, the file is going to large, very large. >>> rich >>> >>> On Saturday, 4 December 2021 at 20:08:19 UTC-5 [email protected] wrote: >>> >>>> Take the accumulator stuff out. >>>> >>>> Why not just use $hour.co2.last? >>>> >>>> >>>> >>>> On Sat, Dec 4, 2021 at 4:17 PM gjr80 <[email protected]> wrote: >>>> >>>>> Suggesting use of $hour_delta=1 wasn’t wise on my part as data >>>>> arriving once per 60 minutes will likely lead to some occasions where no >>>>> data is displayed depending on exactly when the data arrives. Conceivably >>>>> data arriving or being processed a few seconds late could fall outside of >>>>> $hour_delta=1. >>>>> >>>>> Actually, thinking some more, you my be able to use the aggregate >>>>> ‘last’ to get the last value in the aggregation period, so try >>>>> $span($hour_delta=2).co2.last. I may be mistaken but I think the >>>>> aggregates >>>>> exclude the None values so this tag may give you the most recent non-None >>>>> value in the last two hours. Refer to >>>>> http://weewx.com/docs/customizing.htm#Tag_$span and >>>>> http://weewx.com/docs/customizing.htm#aggregation_types. >>>>> >>>>> Failing that you may like to try $span($time_delta=3900).co2.avg or >>>>> 4200 to display the average over the last 70 or 80 minutes. Be aware >>>>> though that just as $hour_delta=1 missed some records going the other way >>>>> to > 1 hour will likely see more than one record be included in some >>>>> aggregates, probably not an issue but something to be aware of. >>>>> >>>>> Gary >>>>> On Sunday, 5 December 2021 at 08:35:01 UTC+10 [email protected] wrote: >>>>> >>>>>> I've tried a few suggestions. The sensor output time can be changed >>>>>> to a shorter period but, at this point, I prefer to keep it at 60 >>>>>> minutes >>>>>> since the internal battery looks impossible to change easily. At 60 >>>>>> minutes >>>>>> it is supposed to last a little over 3 years. >>>>>> >>>>>> I added the suggestion " $span($hour_delta=1).co2.avg" which seems to >>>>>> bring in data more often but there are still some periods of "N/A." >>>>>> >>>>>> I added " expires_after = none" but for now that doesn't seem to do >>>>>> anything. >>>>>> >>>>>> The suggestion of writing data to a scratch file may be the only way >>>>>> to go if I can't configure it another way. >>>>>> >>>>>> I have produced a daily graph on the main page >>>>>> >>>>>> [image: yafe6kzk.bmp] >>>>>> >>>>>> The sensor is in the house for now and the peaks seem to come from >>>>>> using the oven and burners on the gas stove. >>>>>> >>>>>> Thanks for all the help. I'll give this a day or so to accumulate >>>>>> some data. >>>>>> On Saturday, December 4, 2021 at 4:46:26 PM UTC-5 [email protected] >>>>>> wrote: >>>>>> >>>>>>> Bob, >>>>>>> As noted earlier, now that you have a base MQTTSubscribe >>>>>>> configuration up and running, you probably want to look at its 'archive >>>>>>> record cache capability'. Details are here, >>>>>>> >>>>>>> https://github.com/bellrichm/WeeWX-MQTTSubscribe/wiki/Configuring-additional-options#expires_after >>>>>>> >>>>>>> I think that setting expires_after to none would be the simplest. So >>>>>>> you would end up with something like this. >>>>>>> [MQTTSubscribeService] >>>>>>> [[topics]] >>>>>>> [[[mytopic]]] >>>>>>> ignore = true >>>>>>> [[[[CO2_Value_PPM]]]] >>>>>>> name = co2 >>>>>>> ignore = false >>>>>>> expires_after = none >>>>>>> >>>>>>> rich >>>>>>> >>>>>>> On Saturday, 4 December 2021 at 15:09:39 UTC-5 gjr80 wrote: >>>>>>> >>>>>>>> The other approach is to give WeeWX at least one co2 value per >>>>>>>> archive period (it can be the same value) but that is a function of >>>>>>>> your >>>>>>>> data source and the driver being used and I don’t know the >>>>>>>> limitations/capabilities of each. >>>>>>>> >>>>>>>> Gary >>>>>>>> >>>>>>>> On Sunday, 5 December 2021 at 05:56:10 UTC+10 gjr80 wrote: >>>>>>>> >>>>>>>>> The issue here is that the ‘co2 field’ receives data only once per >>>>>>>>> hour, so based on a 15 minute archive period only one in four archive >>>>>>>>> records will have co2 data. Changing the accumulator type and >>>>>>>>> extraction >>>>>>>>> policy will not change this. I would leave the co2 accumulator >>>>>>>>> settings out >>>>>>>>> of weewx.conf. I doubt whether $last will be much help either; $last >>>>>>>>> displays data from the last known good record in the database as >>>>>>>>> opposed to >>>>>>>>> the current record used by $current. If there is no co2 data in most >>>>>>>>> records then $last will provide a similar result. >>>>>>>>> >>>>>>>>> You may have better luck with some sort of aggregate over the past >>>>>>>>> hour, say something like (untested) $span($hour_delta=1).co2.avg. >>>>>>>>> The actual aggregate is probably meaningless since you only have one >>>>>>>>> value >>>>>>>>> per hour so min be mx will work just as well. >>>>>>>>> >>>>>>>>> Gary >>>>>>>>> On Sunday, 5 December 2021 at 03:59:46 UTC+10 [email protected] >>>>>>>>> wrote: >>>>>>>>> >>>>>>>>>> Sorry, here is some info. This time, I re-inserted the >>>>>>>>>> [Accumulator] paragraph at a different place in weewx.conf and it >>>>>>>>>> restarted >>>>>>>>>> without an exit. The web data is still showing "$last.co2" >>>>>>>>>> It ran for a while and then stopped. Debug file attached. Thanks >>>>>>>>>> weewx.conf >>>>>>>>>> >>>>>>>>>> # Options for 'MQTTSubscribeService' >>>>>>>>>> [Accumulator] >>>>>>>>>> [[co2]] >>>>>>>>>> accumulator = firstlast >>>>>>>>>> extractor = last >>>>>>>>>> >>>>>>>>>> [MQTTSubscribeService] >>>>>>>>>> # This section is for the MQTTSubscribe service. >>>>>>>>>> >>>>>>>>>> # Turn the service on and off. >>>>>>>>>> # Default is: true >>>>>>>>>> # Only used by the service. >>>>>>>>>> enable = true # false >>>>>>>>>> ================================================== >>>>>>>>>> index.html.tmpl >>>>>>>>>> <tr class = "even"> >>>>>>>>>> <td class="stats_label">105 Crawl Temperature</td> >>>>>>>>>> <td class="stats_data">$current.extraTemp1 / >>>>>>>>>> $current.extraTemp1.degree_C</td> >>>>>>>>>> </tr> >>>>>>>>>> <tr class = "even"> >>>>>>>>>> <td class="stats_label">CO2 level</td> >>>>>>>>>> <td class="stats_data">$last.co2</td> >>>>>>>>>> </tr> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> ================================================== >>>>>>>>>> >>>>>>>>>> Standard web page reads: (http://grattans.org/wx) >>>>>>>>>> >>>>>>>>>> 105 Crawl Temperature 72.0°F / 22.2°C >>>>>>>>>> CO2 level $last.co2 >>>>>>>>>> >>>>>>>>>> On Saturday, December 4, 2021 at 12:07:09 PM UTC-5 vince wrote: >>>>>>>>>> >>>>>>>>>>> On Saturday, December 4, 2021 at 7:16:00 AM UTC-8 >>>>>>>>>>> [email protected] wrote: >>>>>>>>>>> >>>>>>>>>>>> I tried changing $current.co2 to $last.co2 but it only printed >>>>>>>>>>>> "$last.co2" on the web page. >>>>>>>>>>>> >>>>>>>>>>>> Adding the [Accumulator] section to weewx.conf only caused an >>>>>>>>>>>> error and exit when I restarted weewx. I tried adding this in >>>>>>>>>>>> several >>>>>>>>>>>> places but none seems to let weewx restart without an exit error. >>>>>>>>>>>> Is there >>>>>>>>>>>> a special place to add this? Couldn't find anything in the doc >>>>>>>>>>>> about >>>>>>>>>>>> placement. Thanks >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>> Usual answers apply. >>>>>>>>>>> >>>>>>>>>>> Unless you post the error messages verbatim and/or the changes >>>>>>>>>>> you made to the skin, we are not going to be able to help you. >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "weewx-user" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/weewx-user/60583ac3-73f3-479c-91d0-34fcdf1c0865n%40googlegroups.com >>>>> >>>>> <https://groups.google.com/d/msgid/weewx-user/60583ac3-73f3-479c-91d0-34fcdf1c0865n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>> -- You received this message because you are subscribed to the Google Groups "weewx-user" group. 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