Pressure reading seems to track temperature
Nobody has claimed this yet.
Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 35/100
- Issue type
- Bug
- Clarity
- Needs clarification
- Activity status
- Stale
- Tech stack
- python
- Domain
- embedded-iot
Research direction
Start by reproducing the reported BAR02 pressure-versus-temperature behavior using the library and the datasheet's compensation formulas. Compare the calculated readings with the BMP280 atmospheric-pressure reference and water-depth changes; done means the compensation problem is explained and a verified correction or clear usage issue is documented.
Written by the indexing model from the issue text.
Description
I have been having problems with accurate readings from several BAR02’s. I am measuring the water depth in an outdoor water fountain tank (20cm deep).
I finally plotted absolute pressure (Bar02 - atmospheric pressure measured with a BMP280) vs water temperature, measured with the BAR02. There is an exact correlation.
In the attached, there is rain at midnight, and the water pump switches on at 8:00am and off at 10:00am. The jumps in water pressure is reflected in the changes in water depth of the tank.
I have tried two different BAR02’s with the same result. It’s as if the temperature compensation is not working. The library init’s just fine though, so the CRC is correct. I have checked the math, and it corresponds to the datasheet.
Something is not right though.
- Dominant language
- Python
- Stars
- 33
- Forks
- 41
- PR merge metrics
- No merged PRs in 30d
Getting set up
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First steps
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