Adjust gain values#17

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ladyada merged 1 commit intoadafruit:masterfrom

OleMchls:patch-1

Feb 21, 2021

Contributor

OleMchls commented Feb 19, 2021 •

edited

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I extensively studied the implementation while creating a VL6180X for Elixir nerves, and found these Gain values that definatly seem off. I also noticed some other oddities but want to just use review comments to ask for clarifications before adding code changes around it.

Everything in this PR is based on this datasheet: https://www.st.com/resource/en/datasheet/vl6180x.pdf


          Adjust gain values

6cedda5

OleMchls commented

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OleMchls left a comment

I can only commend on code close to my changes, so the rest goes in writing:

        self._write_8(_VL6180X_REG_SYSALS_INTEGRATION_PERIOD_HI, 0)
        self._write_8(_VL6180X_REG_SYSALS_INTEGRATION_PERIOD_LO, 100)

https://github.com/adafruit/Adafruit_CircuitPython_VL6180X/pull/17/files#diff-9f707f011a85c59e078609f72513b1ca856a8bda539725fad5e803149fe65125R130
This register is undocumented.

https://github.com/adafruit/Adafruit_CircuitPython_VL6180X/pull/17/files#diff-9f707f011a85c59e078609f72513b1ca856a8bda539725fad5e803149fe65125R129
The datasheet here recommends a value off 100, it seems the registers here were kind of mixed up.

adafruit_vl6180x.py

Comment on lines 163 to 164

		lux *= 100
		lux /= 100 # integration time in ms

Contributor Author

OleMchls Feb 19, 2021

This seems strange to me. Is that just to enfore float to be returned? Wouldnt then just

Suggested change

      
                    lux *= 100
          
                    lux /= 100  # integration time in ms
          
                    lux /= 1

suffice?

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ladyada merged commit e26b4ac into adafruit:master

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