[Dprglist] 2D TOF sensor array project

[Doug Paradis]

David,
      As you mentioned the FRS is ~6 per the article. Several people have
expressed interest in the STI VL53L1X type of sensor and this project shows
how to make a 180 deg array using 9 of them and a Nuecleo board. The code
can be found  in the STI app note at
https://www.st.com/en/embedded-software/stsw-img017.html. This would be a
leg up for any one considering this type of sensor. How the VL53L1x sensors
work can be found at
https://community.element14.com/learn/learning-center/essentials/w/documents/5037/time-of-flight-sensors?ICID=I-CT-LP-TC-0000515-2D_LIDAR-LEARN_MORE_TOF-NOV21-WF2601054
. You may need to have an e14 account.

On Mon, Apr 25, 2022 at 3:34 PM David P. Anderson via DPRGlist <
dprglist at lists.dprg.org> wrote:

> DPRG
>
> "The Time-of-Flight (ToF) sensor measures the distance by calculating the
> time taken by a light pulse to travel from the source to the observed
> target and then return to the detector. The following formula calculates
> the flight time:
>
> Distance value = Photon travel time/2 x the speed of light"
>
> Is that really true?  Speed of light is about a foot per nanosec.   So
> measuring an object 10 feet away should take 20 nanosecs.   None of these
> TOF sensors have that sort of response.  I thought they were measuring
> phase differences in a group of pulses, or something like that, and doing
> it over and over to get a reliable reading.
>
> From the article: "The timing budget is around 12mS per sensor ‘zone,’
> which would equate to a total sweep time of approximately 160mS, giving a
> frame rate of a little more than 6 FPS."
>
>
> dpa
>
>
> On 4/25/22 3:13 PM, Doug Paradis via DPRGlist wrote:
>
> * [EXTERNAL SENDER]*
> -All,
>     This might be of interest to you:
> https://www.newark.com/how-to-implement-2d-lidar-using-time-of-flight-sensors
>
> Regards,
> Doug P.
>
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