Re: [weewx-development] Pressure resolution and BMP280

Looks good, one thing you can do to make your code a little more readable is to make use the available properties of ValueTuple objects. weewx.units.convertStd returns an object of type ValueTuple. ValueTuple objects have 3 useful properties; .value, .unit and .group. In your code you could

Re: [weewx-development] Pressure resolution and BMP280

So, thanks for all your help, here's what I finally have working. It's a little more generic, as in I can specify in weewx.conf where my BMP library is, what my sea level modifier is, and where I want to store the values, if at all weewx.conf [BMP280] col_pres = pressure col_temp = ''

Re: [weewx-development] Pressure resolution and BMP280

Here's what I have working: #!/usr/bin/env python import syslog import weewx from weewx.wxengine import StdService from Adafruit_BME280 import * class PressureService(StdService):     def __init__(self, engine, config_dict):     super(PressureService, self).__init__(engine, config_dict)   

Re: [weewx-development] Pressure resolution and BMP280

Thanks. I read above that Tom suggested new_valueTuple = weewx.units.convertStd((22.5, "degree_C", "group_temperature"), packet['usUnits']) However packet is undefined in eg, the electricity example. (I get an error) So I am doing pres_tuple = weewx.units.convertStd((hectopascals, "mbar",

Re: [weewx-development] Pressure resolution and BMP280

Right.. ok, makes sense now. The file from Craig Thom seems to do a lot of processing, and converting, and filtering/massaging... so wasn't clear on that point So I went back to the electricity example in the customizing guide, and it sort of makes sense now! I am not sure what all that

Re: [weewx-development] Pressure resolution and BMP280

Hi, In this case order matters. The StdArchive service is the service that does the final processing of archive records and ultimately saves the archive record to database. You have placed your service after StdArchive so by the time your service is obtaining data, and presumably adding it to

Re: [weewx-development] Pressure resolution and BMP280

I am also interested in this, and here's what I've managed to do / not do. I attached the sensor, and ran sudo i2cdetect -y 1 to check it was there. It was showing as position 0x77, which is decimal 119 just as in Craig's post above. These parts were missing above, and I eventually figured

Re: [weewx-development] Pressure resolution and BMP280

I know I saw, somewhere, a way to call an existing weewx method to convert units to whatever is needed, but I can't find it again. It may have been in a service in the Wiki rather than in the documentation, because I can't find it there. Is there such a thing? I didn't like how limited the

Re: [weewx-development] Pressure resolution and BMP280

The only thing that matters is that the packet yielded by the driver use a consistent unit system. Doesn't matter what that unit system is, but all measurements in the packet have to use it. See the Appendix *Units * for the definitions of the three unit systems, US, METRIC, and METRICWX. -tk

Re: [weewx-development] Pressure resolution and BMP280

Thanks. In the MySQL database it's a double, so the resolution is there. My weewx is using American measures and putting inHg in the database. Do i need to convert from Pascals before handing the data back?

Re: [weewx-development] Pressure resolution and BMP280

Weewx doesn't round anything. It just passes values on to the database. How the database handles it depends on the type of database, driver, and how it's configured. -tk On Sat, Apr 1, 2017 at 11:03 AM, Craig Thom wrote: > I'm working an a RPi SPI service to read a