antirez / antirez/bme680-pure-mp
Minor error in formula to calculate air pressure
- Dominant language
- Python
- Stars
- 20
- Forks
- 1
- PR merge metrics
- No merged PRs in 30d
Description
I think I have found a very, very small error in the calculation of the air pressure. As far as I know, URL https://github.com/boschsensortec/BME68x_SensorAPI/ contains the reference API for handling data from a BME680 sensor. Line 871 in this driver reads:
` var2 = ((((var1 >> 2) * (var1 >> 2)) >> 11) * (int32_t)dev->calib.par_p6) >> 2;
`
In your driver this corresponds with line 69, which reads:
` var2 = (((var1 >> 2) ** 2) >> 11) * (self.par_p6 >> 2)`
I think it should read:
` var2 = ((((var1 >> 2) ** 2) >> 11) * self.par_p6) >> 2`
Running some tests show that the (absolute) difference between the air pressures calculated using both variants of the formula set is much less than 1 [hPa], thus much less than the typical accuracy. So normally, one will not notice the difference.
Contributor guide
No contributing guide indexed for this repository
Assessment
This issue has not been assessed yet.