programming FOV

[rexxdad]

we are using the early version 1x in a vertical detection mode.  it has a 23 degree fov. 

in some of our testing we determined we need more.. FOV

 

currently we tilt the board holding the TOF sensor to eliminate wasted FOV where the sensor would be projecting on a wall.  tof mounted 8ft high on the wall, projecting down, so we have tilted the FOV out, so that the back edge of the FOV is parallel to the wall its mounted on. 

 

the newer 5x/8x have bigger FOV.. 63 and 90 degrees..

 we don't need that much, BUT  I would like to detect on the outer edge, vs a smaller square 

4x4 with edge against the exclusion zone. or 6x4 with the 4 edge against the exclusion zone. 

pic attached, box mounted on wal, tof pointing down,  zoom in on box, 

pad layout and detection zone

is this possible? 

 

we need 6-10ft of detection in a narrow band. maybe 20-24 inches wide. 

 

[John E KVAM]

The VL53L8CX is our best sensor. It's the result of doing this for 10 years. It will range the farthest and give you a distance to a 12-inch target at 6 feet. (It has 8x8 zones at 5 degrees per zone.) I'm quite certain it will solve your problem. But it does cost more than the VL53L1X. And it uses more power, and the software is more complex (although we have written most of it for you.)

If you use the L1 with the most restrictive FoV you would cover that 2ft target, but you have reduced the number of photon detectors so much that I fear you might not get the range you desire. 

So here is what to do...

First figure out if you project can afford that VL53L8. If so, invest the $56 dollars in the eval kit and try it. 

I suspect it will do everything you need. 

(Sorry I could not load the screenshot, or I might have given you a better answer.)

- john

[rexxdad]

thanks,  I wonder why you couldnt open the jpg? work security policy?

 

 

[John E KVAM]

"I wonder why you couldn't open the jpg? work security policy?" 

That's pretty funny. I work for ST. And that's the sort of policy we could enact.

It did open the Fifth time I tried it. 

I like your tilt idea. No reason to range on the wall if you know it's there. 

just offset your Region of Interest (ROI)as you have shown, and you will be doing it the best you can. 

Increase your TimingBudget as much as you can. Narrowing the ROI limits the distance you can see, so you might need more time to get enough photons back. 

1000 cycles per month should be no issue. 

But you could just drop the XShut line, and most the chip will turn off. maybe not the absolute lowest power, but it's pretty low.

- john

 

[rexxdad]

thanks I have the timing  budget at 50 so far, have not set a custom ROI yet.(on the 1x)

initial responsiveness is important