Associate II

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How do I download other versions of the software?

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I want to download other versions of STSW-IMG019 software, how can I download it?

At present, the official website can only download the final version

Time of flight

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Zhiyuan.HanBest answer

ST Technical Moderator

Hi

We checked the code update history and found that we have updated VL53L1CB API recently to limit the max ranging ability at our door condition, this is to avoid unstable ranging data under high ambient noise level. We set a very tight parameter by default, if you want to make the sensor work under sunlight, you can try to increase “#define MAX_AMBIENT 2 * 65536” inside SetTargetData() step by step according to your use case request.

Please be noted, if you increase the value to a very big value, the ranging data will become unstable with ambient noise increase.

Br

Zhiyuan.Han

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John E KVAM

ST Employee

Can you contact us by going through the support page and creating a ticket. Tell us what you want in the older version and perhaps we can find it for you.

Don't want to publish them all - it's too much effort and you are the only one asking.

I'd like to know why you want it as well.

thanks,

- john

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U

User.120Author

Associate II

The reason we wanted the old version is that we found that the old version performed better than the new version outdoors, where the test distance of the old version can reach more than 5 meters outside, while the latest version can only reach 3 meters.

The IC we use is VL53L1CB, the old version uses 6.6.13 rev 2608, the new version uses 6.6.18 rev 2652.

The test environment is outdoor facing a white wall, using DistanceMode=VL53L1_DISTANCEMODE_LONG, PresetMode=VL53L1_PRESETMODE_RANGING

So we wanted to test this phenomenon with more older versions

Zhiyuan.Han

ST Technical Moderator

Hi

Due to VL53L1CB is working in 940nm and there is 940nm in the sunlight, so the sunlight is ind of noise to TOF sensor, so sunlight will affect TOF sensor ranging ability.

As the sunlight intensity is changing with time going, and also could be affected by cloud. Here I want to double confirm with you, did you do the outdoor ranging performance with both driver version(6.6.13 and 6.6.18) at same time? if you do the test at different time, the performance could be different.

Br

Zhiyuan.Han

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U

User.120Author

Associate II

Yes, we have compared many times. Whether in the MEDIUM mode or the LONG mode, the outdoor performance of 6.6.13 is superior to that of 6.6.18. Especially in the MEDIUM mode, 6.6.18 often returns status=4 outdoors.

Zhiyuan.HanBest answer

ST Technical Moderator

Hi

We checked the code update history and found that we have updated VL53L1CB API recently to limit the max ranging ability at our door condition, this is to avoid unstable ranging data under high ambient noise level. We set a very tight parameter by default, if you want to make the sensor work under sunlight, you can try to increase “#define MAX_AMBIENT 2 * 65536” inside SetTargetData() step by step according to your use case request.

Please be noted, if you increase the value to a very big value, the ranging data will become unstable with ambient noise increase.

Br

Zhiyuan.Han

In order to give better visibility on the answered topics, please click on 'Accept as Solution' on the reply which solved your issue or answered your question.

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