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module: calculate UVA light intensity correctly for rset != RSET_240K

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- compensation for rset != RSET_240K was wrong, it increased UVA power/ADC step for rset > RSET_240K
- UVA power/ADC step should have been decreasing as refresh time (sampling time) got longer
- same behavior as with integration_time setting, that works correctly
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cn
2019-09-19 01:18:42 +02:00
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@@ -19,6 +19,7 @@ Not all functions of the chip are supported, especially not the interrupt handli
In September 2019 it was discovered (and fixed) that:
- previously the sensor was never shutdown between measurements which wastes power but still takes measurements successfully
- the UVA light intensity was calculated wrongly (too high) for `rset != RSET_240K` due to wrong compensation: higher `rset` leads to higher sampling time leads to higher absolute ADC step counts which *should* lead to every ADC step indicating a smaller amount of `W/(m*m)` of UVA power and a higher precision of the final UVA power but it wrongly behaved the opposite way. The `integration_time` worked correctly all the time.
## License