VL53L8CH raw data

aroshani · ‎2024-05-22

Hello,

We want to do an experiment for smoke detection with ST's ToF technology. We are using the following STM products:

- VL53L8CH

- x-Nucleo-53l7a1

- STSW-IMG043

The GUI has so many configurations and it provides raw data and algorithm output data. We are interested in raw data and we want to know which configuration affects the row data. I mean in the same environment, will the sensor raw data change if we change the configuration?

What is the effect of ambient light on the sensor's raw outputs?

Thank you!

RogerM · ‎2024-05-22

Basic configuration of the device mode is done via:
Resolution
RangingPeriod
IntegrationTime

Configuration of what histogram data to capture is done with:
cnhStartX
cnhStartY
cnhMergeX
cnhMergeY
cnhCols
cnhRows
cnhNumBins
cnhStartBin
cnhSubSample

What data to upload to host is set by:
ZoneMode
ExtendedMode
ExtendedFlags

Preprocessing to reduce the effects of optical veiling glare is controlled by 'DivisorVG' ... set to zero to disable this processing.

In CNH data the ambient light level is removed (subtracted) from the histogram data.

Anne BIGOT · ‎2024-05-24

Can you please confirm which HW you are using ? The X-NUCLEO-53L7A1 has a sensor compatible with the VL53L7CH. If you want to test the VL53L8CH you have to use the X-NUCLEO-53L8A1.

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Peter BENSCH · ‎2024-05-24

@aroshani I assume that you want to do smoke detection outdoors?

We do have smoke detection software, but this only works indoors in conjunction with ToF sensors. The reason for this is the influence of sunlight, which literally clogs ToF sensors so that the reflected laser pulses are outshone and can no longer be meaningfully analysed. If sunlight can fall on the ToF and the surroundings are not clearly shaded, you will most likely not obtain a reproducible result with ToF.

Regards
/Peter

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aroshani · ‎2024-05-24

Thank you RogerM!

aroshani · ‎2024-05-24

Thank you Anne!

We are using X-NUCLEO-53L8A1.

Regards,

Abbas

aroshani · ‎2024-05-24

Hi Peter,

Thank you for your support.Yes our target is outdoor application.

Could you please let me know, where can I found your software and sample code for indoor smoke detection?

It will be helpful.

Regards,

Abbas

Peter BENSCH · ‎2024-05-24

Smoke Detection and Air Quality Monitoring was developed by our partner Mobile Physics, from whom you can obtain further information.

There is also some introduction, e.g. as a video from CES 2024 or in the NewsRoom.

Hope that helps?

Regards
/Peter

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