Comments (8)
coelner
commented on July 21, 2024
1
@finitespace I think we need a deep dive into the code and fix rare cases. Maybe some things could be fixed by integrate the pending pull requests.
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finitespace
commented on July 21, 2024
The datasheet is a little ambiguous, but it sounds like we could do a measurement without filtering and this will cause the filter buffer to be initialized with values. Is that your interpretation as well? See the section under Table 6.
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coelner
commented on July 21, 2024
Yes, I see it in the same way. I'm not sure why we get no valid values for the first time. They should be copied directly like it is done for the following measurements.
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finitespace
commented on July 21, 2024
Alright, I have added a routine to initialize the filter buffer. Could you pull down the filtering branch and check if it fixes the problem?
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coelner
commented on July 21, 2024
Yes, it does work for me. I used your BME_280_I2C_Test sketch.
Found BME280 sensor! Success.
Temp: 22.42°C Humidity: 44.26% RH Pressure: 97900.85Pa
Temp: 22.33°C Humidity: 44.31% RH Pressure: 97908.03Pa
Temp: 22.32°C Humidity: 44.28% RH Pressure: 97907.81Pa
Temp: nan°C Humidity: nan% RH Pressure: nanPa
Temp: 23.53°C Humidity: 63.39% RH Pressure: 69626.69Pa
Temp: 24.06°C Humidity: 40.52% RH Pressure: 97906.53Pa
Temp: 24.07°C Humidity: 40.53% RH Pressure: 97906.59Pa
Temp: 24.07°C Humidity: 40.51% RH Pressure: 97906.31Pa
I disconnect the BME from 3.3V (nan values) and reattach it.
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AndreKR
commented on July 21, 2024
@coelner In your output the first read after your disconnect is still way off, especially the pressure. Is this still to be expected?
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coelner
commented on July 21, 2024
1)
Could not find BME280 sensor!
Could not find BME280 sensor!
Could not find BME280 sensor!
2)
Found BME280 sensor! Success.
Temp: 22.18°C Humidity: 68.12% RH Pressure: 73302.31Pa
Temp: 26.73°C Humidity: 66.95% RH Pressure: 101237.52Pa
Temp: 26.70°C Humidity: 48.61% RH Pressure: 101237.36Pa
Temp: 26.66°C Humidity: 41.93% RH Pressure: 101237.63Pa
Temp: 26.62°C Humidity: 38.96% RH Pressure: 101237.44Pa
Temp: 26.57°C Humidity: 37.40% RH Pressure: 101237.91Pa
Temp: 26.51°C Humidity: 36.45% RH Pressure: 101237.97Pa
Temp: 26.46°C Humidity: 35.89% RH Pressure: 101237.78Pa
Temp: 26.40°C Humidity: 35.58% RH Pressure: 101237.60Pa
Temp: 26.34°C Humidity: 35.41% RH Pressure: 101237.97Pa
Temp: 26.28°C Humidity: 35.18% RH Pressure: 101238.09Pa
Temp: 25.36°C Humidity: 33.31% RH Pressure: 101231.35Pa
Temp: 25.36°C Humidity: 33.13% RH Pressure: 101231.18Pa
Temp: 25.36°C Humidity: 36.83% RH Pressure: 101231.12Pa
3)
Temp: nan°C Humidity: nan% RH Pressure: nanPa
Temp: nan°C Humidity: nan% RH Pressure: nanPa
Temp: nan°C Humidity: nan% RH Pressure: nanPa
Temp: nan°C Humidity: nan% RH Pressure: nanPa
Temp: nan°C Humidity: nan% RH Pressure: nanPa
4)
Temp: 25.37°C Humidity: 38.29% RH Pressure: 101230.91Pa
Temp: 25.39°C Humidity: 47.79% RH Pressure: 101231.15Pa
Temp: 25.42°C Humidity: 45.15% RH Pressure: 101231.32Pa
Temp: 25.44°C Humidity: 39.14% RH Pressure: 101231.70Pa
Temp: 25.65°C Humidity: 33.12% RH Pressure: 101230.97Pa
5)
Temp: 22.18°C Humidity: 68.12% RH Pressure: 73302.31Pa
Temp: 22.18°C Humidity: 68.12% RH Pressure: 73302.31Pa
Temp: 22.18°C Humidity: 68.12% RH Pressure: 73302.31Pa
Temp: 22.18°C Humidity: 68.12% RH Pressure: 73302.31Pa
Temp: 22.18°C Humidity: 68.12% RH Pressure: 73302.31Pa
Temp: 22.18°C Humidity: 68.12% RH Pressure: 73302.31Pa
Temp: 22.18°C Humidity: 68.12% RH Pressure: 73302.31Pa
Temp: 22.18°C Humidity: 68.12% RH Pressure: 73302.31Pa
6)
Temp: 26.85°C Humidity: 47.34% RH Pressure: 101235.56Pa
Temp: 26.85°C Humidity: 48.57% RH Pressure: 101235.53Pa
To sum it up:
- No connection over i2c but power
- Connection over i2c
- No connection over i2c but power
- reattached i2c
- removed GND
- reattached GND
the current i2c example was used
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AndreKR
commented on July 21, 2024
So in your case at least the first value is off, too.
Here are 25 pressure measurements (in hPa) I took right after switching on the sensor:
705.31
705.31
705.31
1027.43
1027.43
1027.43
1027.47
1027.47
1027.47
1027.47
1027.50
1027.50
1027.50
1027.46
1027.46
1027.46
1027.50
1027.50
1027.43
1027.43
1027.43
1027.41
1027.41
1027.41
1027.41
It puzzles me why there are 3 wrong values and then they start to be plausible. Is it possible that in addition to the first value being wrong, I'm also reading the same value multiple times? I'm in forced mode (default), so each bme.read() should trigger one measurement and wait for its completion, right?
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Related Issues (20)
- branch softwarewire - third instance problem HOT 1
- Station météo
- Station météo
- Filter is only applied to temperature and pressure HOT 3
- STM32F103C8 - bme.begin (); - program stops HOT 3
- BME280 v3.0 not work with u8g2 and display HX1230_SW_SPI HOT 3
- The question of the wind chill HOT 3
- non void function without return value HOT 1
- Propose License Change to LGPL/MIT HOT 28
- AbsoluteHumidity and HeatIndex environment calculations missing HOT 1
- Implement CI HOT 1
- Change Wire hard code over to passed in wire instance in I2C class
- BME280 no humidity :( HOT 1
- BME680 integration HOT 1
- SPI.h is inculed althought BME280Spi is not in use HOT 1
- non-void-return issue in 3.0.0 HOT 6
- ESP32 boot loop when calling bme.begin() HOT 3
- I2C to USB
- delete
- delete HOT 1
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