Taking advantage of the VL53L1_set_user_zone function

[dankelley2]

Forgive me for my novice understanding(I am fairly new to C++ and C), but is there a way to take advantage of this convenience function?

vl53l1_api_core.c Line 1050:

I understand this sensor has a roughly 27 degree FOV, does anybody know if that is while using the smallest SPAD array size possible? (4x4 I believe)

[nseidle]

I believe this is a duplicate of this issue. Let me know if I'm mistaken.

We don't implement the full ST driver so can can't use this function easily. But we are attempting to implement SPAD array configuration. It's hard and has a lot of unintended consequences that we're working with ST on.

[ash73]

Any progress on this? I'm hoping to use a VL53L1X to measure distances inside a narrow (140mm) tube which would require the minimum field of view (15 deg) to measure only 50cm. The pololu ST VL53L1X API implementation has the SetUserROI function but doesn't seem to work on a ESP32 Arduino, whereas this SparkFun library does work but doesn't have the ROI function. Just my luck!

[Grahldg]

Hello @dankelley2 and @ash73 ,

I added a couple of methods for using custom ROI based on ST's API. They are the following:

void VL53L1X::setUserRoi(UserRoi *roi)

and

UserRoi* VL53L1X::getUserRoi()

As well as the following struct:

typedef struct{
    uint8_t topLeftX;
    uint8_t topLeftY;
    uint8_t bottomRightX;
    uint8_t bottomRightY;
}UserRoi;

The lower left corner of the array has coordinates (0, 0) and the upper right has coordinates (15, 15) and you need to set the upper left and lower right which is somewhat counter-intuitive. I had to draw diagrams to make sure I was getting the correct coordinates.

If you have any more questions, please let me know.

[LGKev]

@dankelley2

I understand this sensor has a roughly 27 degree FOV, does anybody know if that is while using the smallest SPAD array size possible? (4x4 I believe)

Section 3.6 of the Data sheet lists the FoV for varying array sizes. 27 degree for a 16x16 array. 4x4 has a FoV of 15 degrees.