VL53L0x Offset calibration and Crosstalk calibration

[zhy]

Hi

   follow  can  make offset calibration？Place the object 14cm away .Must be in a dark environment?

   

follow can make Crosstalk calibration?   Place the object 60cm away.

my coverglass like follow,The measured distance seems very short. How can I solve this problem?

follow is my read out data

 

 

 

 

[Zhiyuan.Han]

Hi

About offset calibration, normally we suggest do offset calibration at short distance(10cm or 14cm) with white target (88% reflectance) in dark condition. 

About xtalk calibration, can you share your ranging data in dark condition? normally we suggest do xtalk at reorted distance start to drop, refer below picture. 

And you shared ranging data is under the sun, VL53L0CX ranging ability will decrease with IR noise increase, as sun also contain 940nm noise, so sun light will impact VL53L0CX max ranging ability 

 

you can refer UM for more detail.

VL53L0X API User_Manual.fm

 

Br

Zhiyuan.Han

[zhy]

Hi，dear Zhiyuan.Han

  follow is offset calibration value:14cm 

follow is talkcross calibration 60cm  not under sun

 

 

 

[zhy]

Hi，dear han

    I used continue mode,I set  Thresh_Low = 250,Thresh_High=255,  I made clibration. find without coverglass is OK

if coverglass , it Trigger interrupt when there are not object before sensror.

[zhy]

Hi，

  I positioned the glass cover in front of the sensor and performed offset calibration at 14cm. The actual and measured distances are as follows. Where should I perform the CROSSTALK calibration?

 

[Zhiyuan.Han]

Hi

From the data seems your calibration is not succeeded, or you forgot set the offset value after rebooting, normally after doing offset, if you do range measurement, the reported distance will be around 140mm, but your measurement data is 170mm. 

Anyway, from your test result, I suggest you do xtalk between 650~700mm.

 

Br

Zhiyuan.Han

[zhy]

Hi,dear Han

  every power up ,I must run 

VL53L0X_Error VL53L0X_set_offset_calibration_data_micro_meter(VL53L0X_DEV Dev,

        int32_t OffsetCalibrationDataMicroMeter)

[Zhiyuan.Han]

Hi

As this discussion is too deep level technical question, let's move to email loop to improve the efficiency and continue communicate the Q&A.

I will initialize an email loop and involve region support team.

 

Br

Zhiyuan.Han

[zhy]

Dear Han, 

   OK

       thank you