Thanks
I won't pretend that I understood ........but it may help others.
It did give me a clue as to how to move forward a bit .....I think
I tried this .......and it worked ......an orange line at 4v .......1 step
forward
and telemetry display updates.
[[[dayvolt]]]
yscale = 3.6, 4.2, 0.1
[[[[consBatteryVoltage]]]]
label = Transmitter battery
color = 0xb48242 # blue
# color = 0x4242b4 # red
# place limit line on graph
[[[[voltMin]]]]
data_type = consBatteryVoltage - consBatteryVoltage + 4
label = ' '
color = orange
width = 1
but I want the limit at 3.7v ........so using the above
[[[dayvolt]]]
yscale = 3.6, 4.2, 0.1
[[[[consBatteryVoltage]]]]
label = Transmitter battery
color = 0xb48242 # blue
# color = 0x4242b4 # red
# place limit line on graph
[[[[voltMin]]]]
data_type = consBatteryVoltage - consBatteryVoltage + 3.7
label = ' '
color = orange
width = 1
fail ....errors in the log .......places the orange line, but telemetry
page is now frozen
Mar 9 08:56:06 weatherstn weewx[14006] DEBUG weewx.reportengine: Found
configuration file /etc/weewx/skins/Seasons/skin.conf for report
'SeasonsReport'
Mar 9 08:56:06 weatherstn weewx[14006] DEBUG user.MQTTSubscribe: (Driver)
data-> final loop packet is tele/weather-stn-sensor/STATE 2022-03-09
08:56:04 AEST (1646780164): 'batteryStatus1': '0.0', 'consBatteryVoltage':
'4.086810112', 'dateTime': '1646780164.264368', 'extraTemp1': '33.0',
'signal1': '1515', 'signal2': '-34.0', 'supplyVoltage': '12.13632011',
'txBatteryStatus': '0.0', 'usUnits': '17'
Mar 9 08:56:06 weatherstn weewx[14006] DEBUG weewx.cheetahgenerator: Using
search list ['weewx.cheetahgenerator.Almanac',
'weewx.cheetahgenerator.Current', 'weewx.cheetahgenerator.DisplayOptions',
'weewx.cheetahgenerator.Extras', 'weewx.cheetahgenerator.Gettext',
'weewx.cheetahgenerator.JSONHelpers', 'weewx.cheetahgenerator.PlotInfo',
'weewx.cheetahgenerator.SkinInfo', 'weewx.cheetahgenerator.Station',
'weewx.cheetahgenerator.Stats', 'weewx.cheetahgenerator.UnitInfo']
Mar 9 08:56:06 weatherstn weewx[14006] DEBUG weewx.manager: Daily summary
version is 4.0
Mar 9 08:56:06 weatherstn weewx[14006] ERROR weewx.cheetahgenerator:
Evaluation of template /etc/weewx/skins/Seasons/telemetry.html.tmpl failed.
Mar 9 08:56:06 weatherstn weewx[14006] ERROR weewx.cheetahgenerator: ****
Ignoring template /etc/weewx/skins/Seasons/telemetry.html.tmpl
Mar 9 08:56:06 weatherstn weewx[14006] ERROR weewx.cheetahgenerator: ****
Reason: cannot find 'has_data' while searching for 'year.consBatteryVoltage
- consBatteryVoltage + 3.7.has_data'
Mar 9 08:56:06 weatherstn weewx[14006] ERROR weewx.cheetahgenerator: ****
To debug, try inserting '#errorCatcher Echo' at top of template
Mar 9 08:56:06 weatherstn weewx[14006] INFO weewx.cheetahgenerator:
Generated 7 files for report SeasonsReport in 0.29 seconds
Mar 9 08:56:06 weatherstn weewx[14006] DEBUG weewx.manager: Daily summary
version is 4.0
Mar 9 08:56:06 weatherstn weewx[14006] INFO weewx.imagegenerator:
Generated 19 images for report SeasonsReport in 0.23 seconds
Mar 9 08:56:06 weatherstn weewx[14006] INFO weewx.reportengine: Copied 0
files to /var/www/html/weewx
Mar 9 08:56:06 weatherstn weewx[14006] DEBUG weewx.reportengine: Report
'SmartphoneReport' not enabled. Skipping.
Mar 9 08:56:06 weatherstn weewx[14006] DEBUG weewx.reportengine: Report
'MobileReport' not enabled. Skipping.
Mar 9 08:56:06 weatherstn weewx[14006] DEBUG weewx.reportengine: Report
'StandardReport' not enabled. Skipping.
Mar 9 08:56:06 weatherstn weewx[14006] DEBUG weewx.reportengine: Report
'FTP' not enabled. Skipping.
Mar 9 08:56:06 weatherstn weewx[14006] DEBUG weewx.reportengine: Report
'RSYNC' not enabled. Skipping.
I take it that it doesn't like 3.7 ..........I don't understand why.........
the windspeed example is so easy and simple and works using a number with a
decimal point and no equation
should I place the number in quotes ? ...........is there a workaround ?
............or this will never fly ?
thanks again
On Tuesday, 8 March 2022 at 22:56:57 UTC+10 tke...@gmail.com wrote:
> You're right: it's not mentioned in the Customizing Guide, and it really
> should be.
>
> I've modified the guide to include a section about the topic. Hopefully it
> will help. *Including arbitrary expressions
> <https://weewx.com/docs/customizing.htm#arbitrary_expressions_in_plot>*
>
>
> On Mon, Mar 7, 2022 at 10:01 PM Ian Prescott <ianpre...@gmail.com> wrote:
>
>> Hi
>> Could somebody show me how to correctly display a limit / constant value
>> on a plot
>> some time ago I alerted to a post about how to show a constant value in a
>> plot.
>> I have searched but I haven't found the right words to find that post
>> again
>> but I copied it and use it in my skin.conf
>> [[[daywind]]]
>> # [[[[windSpeed]]]]
>> # [[[[windGust]]]]
>>
>> # place limit line on graph
>> [[[[windMax]]]]
>> # data_type = function | this
>> # label = ' ' | does
>> # function_definition = 10.5 | not
>> # function_type = windSpeed | work
>> # color = red
>>
>> data_type = 10.5
>> label = ' '
>> color = orange
>> width = 1
>> [[[[windSpeed]]]]
>> color = 0xb48242
>> [[[[windGust]]]]
>> color = 0x4242b4
>> I think it is a useful feature for me and it displays an orange line at
>> 10.5
>> BTW the red line does not show on the plot and no errors appear in the
>> log (debug=1)
>> see here at oxleyweather.ddnsfree.com
>>
>> Now I would like to display a constant value in another plot.
>> like this
>> [[[dayvolt]]]
>> yscale = 3.6, 4.2, 0.1
>> [[[[consBatteryVoltage]]]]
>> label = Transmitter battery
>> color = 0xb48242 # blue
>> # color = 0x4242b4 # red
>> # place limit line on graph
>> [[[[voltMin]]]]
>> data_type = function
>> label = ' '
>> function_definition = 3.7
>> function_type = consBatteryVoltage
>> color = red
>> # width = 1
>> But this doesn't show a red line, and there are no complaints in the log.
>>
>> However if I use the wind example I get errors in the log .........
>> but not for the wind example ........only about the voltage limit
>> The Customization Guide under ImageGenerator doesn't give any details
>> Thanks
>>
>> Mar 8 15:46:17 weatherstn weewx[14006] INFO weewx.manager: Added record
>> 2022-03-08 15:45:00 AEST (1646718300) to database 'weewx.sdb'
>> Mar 8 15:46:17 weatherstn weewx[14006] INFO weewx.manager: Added record
>> 2022-03-08 15:45:00 AEST (1646718300) to daily summary in 'weewx.sdb'
>> Mar 8 15:46:17 weatherstn weewx[14006] DEBUG weewx.reportengine: Running
>> reports for latest time in the database.
>> Mar 8 15:46:17 weatherstn weewx[14006] DEBUG weewx.reportengine: Running
>> report 'SeasonsReport'
>> Mar 8 15:46:17 weatherstn weewx[14006] DEBUG weewx.restx:
>> StationRegistry: wait interval (91800 < 604800) has not passed for record
>> 2022-03-08 15:45:00 AEST (1646718300)
>> Mar 8 15:46:17 weatherstn weewx[14006] DEBUG weewx.reportengine: Found
>> configuration file /etc/weewx/skins/Seasons/skin.conf for report
>> 'SeasonsReport'
>> Mar 8 15:46:17 weatherstn weewx[14006] DEBUG weewx.cheetahgenerator:
>> Using search list ['weewx.cheetahgenerator.Almanac',
>> 'weewx.cheetahgenerator.Current', 'weewx.cheetahgenerator.DisplayOptions',
>> 'weewx.cheetahgenerator.Extras', 'weewx.cheetahgenerator.Gettext',
>> 'weewx.cheetahgenerator.JSONHelpers', 'weewx.cheetahgenerator.PlotInfo',
>> 'weewx.cheetahgenerator.SkinInfo', 'weewx.cheetahgenerator.Station',
>> 'weewx.cheetahgenerator.Stats', 'weewx.cheetahgenerator.UnitInfo']
>> Mar 8 15:46:17 weatherstn weewx[14006] DEBUG weewx.manager: Daily
>> summary version is 4.0
>> Mar 8 15:46:17 weatherstn weewx[14006] ERROR weewx.cheetahgenerator:
>> Evaluation of template /etc/weewx/skins/Seasons/telemetry.html.tmpl failed.
>> Mar 8 15:46:17 weatherstn weewx[14006] ERROR weewx.cheetahgenerator:
>> **** Ignoring template /etc/weewx/skins/Seasons/telemetry.html.tmpl
>> Mar 8 15:46:17 weatherstn weewx[14006] ERROR weewx.cheetahgenerator:
>> **** Reason: cannot find 'has_data' while searching for 'year.3.7.has_data'
>> Mar 8 15:46:17 weatherstn weewx[14006] ERROR weewx.cheetahgenerator:
>> **** To debug, try inserting '#errorCatcher Echo' at top of template
>> Mar 8 15:46:17 weatherstn weewx[14006] INFO weewx.cheetahgenerator:
>> Generated 7 files for report SeasonsReport in 0.29 seconds
>> Mar 8 15:46:17 weatherstn weewx[14006] DEBUG weewx.manager: Daily
>> summary version is 4.0
>> Mar 8 15:46:17 weatherstn weewx[14006] INFO weewx.imagegenerator:
>> Generated 19 images for report SeasonsReport in 0.23 seconds
>> Mar 8 15:46:17 weatherstn weewx[14006] INFO weewx.reportengine: Copied 0
>> files to /var/www/html/weewx
>> Mar 8 15:46:17 weatherstn weewx[14006] DEBUG weewx.reportengine: Report
>> 'SmartphoneReport' not enabled. Skipping.
>> Mar 8 15:46:17 weatherstn weewx[14006] DEBUG weewx.reportengine: Report
>> 'MobileReport' not enabled. Skipping.
>> Mar 8 15:46:17 weatherstn weewx[14006] DEBUG weewx.reportengine: Report
>> 'StandardReport' not enabled. Skipping.
>> Mar 8 15:46:17 weatherstn weewx[14006] DEBUG weewx.reportengine: Report
>> 'FTP' not enabled. Skipping.
>> Mar 8 15:46:17 weatherstn weewx[14006] DEBUG weewx.reportengine: Report
>> 'RSYNC' not enabled. Skipping.
>>
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>>
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