[Dprglist] 2D TOF sensor array project

[David P. Anderson]

Yes Doug,

I have a couple of those sensors.  The quotes in my post are from the 
article itself, which I read.  I was questioning whether the author 
knows what he's talking about, that's all.

cheers!

dpa


On 4/25/22 4:07 PM, Doug Paradis wrote:
>
> */[EXTERNAL SENDER]/*
>
> 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 
> <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 
> <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 <mailto: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
>>     <https://www.newark.com/how-to-implement-2d-lidar-using-time-of-flight-sensors>
>>
>>     Regards,
>>     Doug P.
>>
>>     _______________________________________________
>>     DPRGlist mailing list
>>     DPRGlist at lists.dprg.org  <mailto:DPRGlist at lists.dprg.org>
>>     http://lists.dprg.org/listinfo.cgi/dprglist-dprg.org  <http://lists.dprg.org/listinfo.cgi/dprglist-dprg.org>
>     _______________________________________________
>     DPRGlist mailing list
>     DPRGlist at lists.dprg.org <mailto:DPRGlist at lists.dprg.org>
>     http://lists.dprg.org/listinfo.cgi/dprglist-dprg.org
>     <http://lists.dprg.org/listinfo.cgi/dprglist-dprg.org>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.dprg.org/pipermail/dprglist-dprg.org/attachments/20220425/51b4a975/attachment.html>