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adafruit / Adafruit_VL53L0X

Arduino library for Adafruit VL53L0X
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How to enable fractional measuring? #17

Closed canDry closed 2 years ago

canDry commented 5 years ago

I see that the api has VL53L0X_SetRangeFractionEnable.

Has anyone got this enabled and working? Plz share the code!

It isn't enabled by default and so measure.RangeFractionalPart always returns 0.

caternuson commented 2 years ago

It needs to be enabled first, otherwise the value will not be updated: https://github.com/adafruit/Adafruit_VL53L0X/blob/9b0321580f830e65e07fd89469f1f9713f8aadd9/src/core/src/vl53l0x_api.cpp#L2283-L2290

VL53L0X_SetRangeFractionEnable is the underlying API call. But that is not currently exposed via the Adafruit wrapper.

The datasheet does not provide much information on this feature. What are the acceptable value for the Enable parameter of VL53L0X_SetRangeFractionEnable()? The feature seems to be a simple on/off toggle, so could just be single bit. But the Enable parameter is typed as a uint8_t, so unclear what all of the bits might potentially do.

I did a quick hack of setting this as 1 and it seems to at least start returning something: Screenshot from 2022-03-15 12-45-49 Apparently the resolution is only 0.25mm, so there are the four raw values of 0, 64, 128, and 192.

Does enabling this affect the non-fractional part of the reading? As well as any other aspect of ranging?

Closing for now. Can reopen if more information can be found.

canDry commented 2 years ago

Thanks for following up on this!