Barometer adding 8 to real value
Tim Tuck
Hi all,
Continuing to debug my new server and I've just noticed that the barometer is showing 1004hPa even though the MQTT packet shows it to be 996.3.
timt@metoffice:~$ mosquitto_sub -h localhost -t weather/#
{"dateTime": "1601013660.0", "inTemp_C":
"26.599999999999998", "outTemp_C": "20.699999999999996",
"inHumidity": "37.0", "outHumidity": "36.0", "pressure_mbar":
"996.3", "relbarometer": "996.3", "luminosity": "10710.0",
"uvradiation": "9.9", "UV": "1.0",
"pm2_5_microgram_per_meter_cubed": "9.0", "soilMoist1_centibar":
"50.0", "soilMoist2_centibar": "29.0", "soilMoist3_centibar":
"25.0", "soilMoist4_centibar": "31.0", "pm2_51_24hav": "14.0",
"lightning_strike_count": "0.0", "rain_cm": "0.0",
"stormRain_cm": "0.0", "rainRate_cm_per_hour": "0.0",
"dayRain_cm": "0.0", "weekRain": "12.8", "monthRain_cm":
"3.1600000000000006", "yearRain_cm": "112.06", "windDir":
"319.0", "windSpeed_kph": "15.840039370176598", "windGust_kph":
"21.96005458138119", "daymaxwind": "12.8", "wh65_batt": "0.0",
"wh41_ch1_batt": "4.0", "wh51_ch1_batt": "0.0", "wh51_ch2_batt":
"0.0", "wh51_ch3_batt": "0.0", "wh51_ch4_batt": "0.0",
"wh57_batt": "5.0", "radiation_Wpm2": "84.5303867403315",
"altimeter_mbar": "1004.3553534926064", "appTemp_C":
"16.512917758224905", "barometer_mbar": "1004.0931570392244",
"beaufort_count": "3.0", "cloudbase_meter":
"2013.8479366602753", "dewpoint_C": "5.086570041655606",
"heatindex_C": "20.699999999999996", "humidex_C":
"20.699999999999996", "inDewpoint_C": "10.699081138141231",
"maxSolarRad_Wpm2": "298.5536941056219", "windchill_C":
"20.699999999999996", "hourRain_cm": "0.0", "rain24_cm": "0.0",
"usUnits": "16.0"}
Anyone with ideas about this problem ?
FYI my production server shows the correct pressure.
Both servers get the data from the same GW1000
It appears that the test server is adding 8 to the measured
number when I compare the graphs of the two servers.
How?? I don't know!
Any help appreciated.
thanks
Tim
See comparisons below...
Test server
Production Server
Graham Eddy
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Production Server
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Tim Tuck
On 25/9/20 4:57 pm, Graham Eddy wrote:
pressure and barometer are present in weewx packet
Hi Graham,
Yes, I've just seen that myself. While a test of the driver shows
it returning the right pressure, its the barometer_mbar
value that gets displayed
If we run both MQTT and test the driver we can see the returned
values.
timt@metoffice:~$ mosquitto_sub -h localhost -t weather/#
{"dateTime": "1601019066.0", "inTemp_C": "25.4",
"outTemp_C": "11.500000000000002", "inHumidity": "40.0",
"outHumidity": "74.0", "pressure_mbar": "1000.0", "relbarometer":
"1000.0", "luminosity": "46.0", "uvradiation": "0.0",
"UV": "0.0", "pm2_5_microgram_per_meter_cubed": "8.0",
"soilMoist1_centibar": "50.0", "soilMoist2_centibar": "29.0",
"soilMoist3_centibar": "25.0", "soilMoist4_centibar": "31.0",
"pm2_51_24hav": "17.9", "lightning_strike_count": "0.0",
"rain_cm": "0.0", "stormRain_cm": "0.1", "rainRate_cm_per_hour":
"0.299999999694", "dayRain_cm": "0.1", "weekRain": "13.8",
"monthRain_cm": "3.2600000000000007", "yearRain_cm": "112.16",
"windDir": "273.0", "windSpeed_kph": "18.360045633613783",
"windGust_kph": "27.720068897809043", "daymaxwind": "18.4",
"wh65_batt": "0.0", "wh41_ch1_batt": "4.0", "wh51_ch1_batt":
"0.0", "wh51_ch2_batt": "0.0", "wh51_ch3_batt": "0.0",
"wh51_ch4_batt": "0.0", "wh57_batt": "5.0", "radiation_Wpm2":
"0.36306235201262826", "altimeter_mbar": "1008.0797115649902",
"appTemp_C": "7.237890566791039", "barometer_mbar":
"1008.0759302730186", "beaufort_count": "3.0",
"cloudbase_meter": "624.7758702411626", "dewpoint_C":
"7.026720747689982", "heatindex_C": "11.500000000000002",
"humidex_C": "11.522561280043154", "inDewpoint_C":
"10.80615363413136", "maxSolarRad_Wpm2": "8.546640595353704",
"windchill_C": "11.500000000000002", "hourRain_cm": "0.05",
"rain24_cm": "0.05", "usUnits": "16.0"}
^Ctimt@metoffice:~sudo PYTHONPATH=/usr/share/weewx
python3 -m user.gw1000 --test-driver --ip-address=172.20.1.16
Using configuration file /etc/weewx/weewx.conf
Interrogating GW1000 at 172.20.1.16:45000
2020-09-25 17:31:10 AEST (1601019070): UV: 0, dateTime:
1601019070, dayRain: 1.0, daymaxwind: 18.4, inHumidity: 40,
inTemp: 25.4, lightning_distance: None, lightning_last_det_time:
None, lightning_strike_count: None, luminosity: 46.0, monthRain:
32.6, outHumidity: 74, outTemp: 11.5, pm2_5: 8.0, pm2_51_24hav:
17.9, pressure: 1000.0, rain: None, rainRate: 3.0, relbarometer:
1000.0, soilMoist1: 50, soilMoist2: 29, soilMoist3: 25,
soilMoist4: 31, stormRain: 1.0, usUnits: 17, uvradiation: 0.0,
weekRain: 13.8, wh41_ch1_batt: 4, wh51_ch1_batt: 0,
wh51_ch2_batt: 0, wh51_ch3_batt: 0, wh51_ch4_batt: 0, wh57_batt:
5, wh65_batt: 0, windDir: 273, windGust: 7.7, windSpeed: 5.1,
yearRain: 1121.6
^C/usr/share/weewx/user/gw1000.py:2128:
DeprecationWarning: isAlive() is deprecated, use is_alive()
instead
if self.thread.isAlive():
timt@metoffice:~$
Both my other server and my dashboard on Ecowitt show the Barometer value as pressure_mbar not barometer_mbar
It's curious as to why there are so many outputs for pressure,
and why do they have a difference of 8 ?
My hand held temp & pressure unit shows the value of pressure the same as pressure_mbar.
I don't know if this is a driver issue or a config issue or an issue with the GW1000?
regards
Tim