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1
Rolling / Re: Time of Flight >>> Rounded Corners !!!
« Last post by Gareth on November 13, 2018, 04:07:31 AM »
By the Way the Module will pick up a 3mm vertical BBQ stick at distance, not many sensors have this capability  ???
2
Rolling / Re: Double_ing up the "Time of Flight" sensors
« Last post by Gareth on November 13, 2018, 04:05:02 AM »
P.S.: You could use a slip ring instead of a wireless connection.
ermmm 100% no  :P
As this project started with the idea of Cost effective LIDAR  (with my aversion to having a slipped disk)......
evolution went so :-
LIDAR with Hollow shaft Stepper     Workio
LIDAR with WIFI Mesh                    Workio slow unstable                   (trashed)
LIDAR with Bluetooth                     Workio Slow solid                        (trashed)
LIDAR 360° Wired Ping-pong style  Workio Fast however twisty wires   (trashed)
LIDAR*2 180° Wired Ping-pong      Workio Fast                                 (Current)
3
Rolling / Re: Time of Flight >>> Rounded Corners !!!
« Last post by Gareth on November 13, 2018, 03:53:46 AM »
so I wonder what causes the rounded corner.
The sensors is darn amazing if you ask me.... there are many hidden register codes which allow you to tune it to your way of using it..
At the moment I am still none the wiser with regards to the rounding.
one guess is that it is picking up reflections (after all it is a IR laser) so a lot of scattering of light is possible, it has good resistance to ambient light (compared to the Sharp sensors (anyone still use them?)).
Another guess is the the laser is TXed in a looooong cone shape and also the received detector receives as a cone. (this does not help I am speculating with my first guess above).
4
Rolling / Re: Time of Flight >>> Rounded Corners !!!
« Last post by Gareth on November 13, 2018, 03:45:41 AM »
What happens if you turn slower (if possible at all)?
I have experimented and there is no difference by slowing it down. (My mind is boggling how it can measure the time it takes for light to travel 5cm)
From the specs the measurement acquisition time is around 40ms ... my current scan rate for 360° is 3 seconds.
5
Rolling / Re: Time of Flight >>> Rounded Corners !!!
« Last post by MEgg on November 12, 2018, 01:01:49 PM »
How fast does this turn?
What happens if you turn slower (if possible at all)?
6
Rolling / Re: Point cloud anyone !!! maybe 3D scanner
« Last post by maelh on November 11, 2018, 05:38:33 AM »
In the past, I have used two servos mounted on each other so I can do a rotation along a 3D sphere and do a scan. To make distant measurements I used a Lidar Lite, though it's rather slow, at least the old version.

It created a nice 3d point cloud of my room. For further processing I planned on using ROS or the PCL (point cloud library), however this is only well supported under Linux, so I am still waiting for the Windows version of ROS to get better.

Since MS is working on it, there might be hope now.

Your point cloud viewer/processor can be found here (for future reference): https://www.danielgm.net/cc/

I used a point cloud viewer that looks pretty similar to the one in your screenshot. Can't find the name anymore. It also supports mesh reconstruction, and allows playing around with it a bit in quite intuitive ways (rotation, scaling, coloring, etc.). Quite useful.

Edit: Found it, while searching for yours! It's called MeshLab: http://www.meshlab.net/

I also played around V-REP to test a virtual 3d scanner, to see what I was doing wrong/right, since part of my scan looked a bit distorted. The reason was that 3d rotation around two angles probably does not form a perfect sphere, because of the relative positioning of the two servos/pivot points. You would need to measure physical offsets from the ideal rotation points and consider that.

I was going to calibrate it with a real 3d box, then use a box of the same measurements in V-REP. But I haven't continued since then. The 3d scan is really slow, and I have no 3d box (of even shape here). Bummer.

Also, I will probably use a Intel RealSense going further. They seem reasonable in size and use now. And much faster than doing a mechanical 3d scan. Could be used to guide a robot through a room by making quick distance measurements in various directions based on the "instantly" (in one frame) captured point cloud.
7
Rolling / Re: Time of Flight >>> Rounded Corners !!!
« Last post by maelh on November 11, 2018, 05:25:15 AM »
I am also looking to use this sensor, so I wonder what causes the rounded corner. From what I remember it has a limited resolution when things are close by, it might be caused by that.
8
Rolling / Re: Double_ing up the "Time of Flight" sensors
« Last post by maelh on November 11, 2018, 05:22:23 AM »
Nice! I also got a couple of theses sensors a couple weeks ago. I have yet to solder the pins on and use them.
To create a point cloud I think a Intel Realsense would be better.

Curious to see where you go with this!

P.S.: You could use a slip ring instead of a wireless connection.
9
3D Printing / Re: removable magnetic print surface
« Last post by Gareth on November 09, 2018, 10:53:45 AM »
Thanks for explaining the ins and outs of the magnetic levitation beds, I have placed an order via Banggood (ali-ex don't except paypal)
10
Links / Re: Robot Cop
« Last post by Valeriex on November 07, 2018, 05:48:20 AM »
Do not know how to help me? About the knowledge I'm looking for, I'm following up on sharing this information.
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* Recent Posts

Re: Time of Flight >>> Rounded Corners !!! by Gareth
[November 13, 2018, 04:07:31 AM]


Re: Double_ing up the "Time of Flight" sensors by Gareth
[November 13, 2018, 04:05:02 AM]


Re: Time of Flight >>> Rounded Corners !!! by Gareth
[November 13, 2018, 03:53:46 AM]


Re: Time of Flight >>> Rounded Corners !!! by Gareth
[November 13, 2018, 03:45:41 AM]


Re: Time of Flight >>> Rounded Corners !!! by MEgg
[November 12, 2018, 01:01:49 PM]


Re: Point cloud anyone !!! maybe 3D scanner by maelh
[November 11, 2018, 05:38:33 AM]


Re: Time of Flight >>> Rounded Corners !!! by maelh
[November 11, 2018, 05:25:15 AM]


Re: Double_ing up the "Time of Flight" sensors by maelh
[November 11, 2018, 05:22:23 AM]


Re: removable magnetic print surface by Gareth
[November 09, 2018, 10:53:45 AM]


Re: Robot Cop by Valeriex
[November 07, 2018, 05:48:20 AM]


Re: it's lukeyes by Valeriex
[November 07, 2018, 05:47:16 AM]


TOF gets a local DEBUG screen by Gareth
[November 07, 2018, 03:47:29 AM]


Time of Flight >>> Rounded Corners !!! by Gareth
[November 07, 2018, 03:46:01 AM]


Point cloud anyone !!! maybe 3D scanner by Gareth
[November 07, 2018, 03:44:49 AM]


Double_ing up the "Time of Flight" sensors by Gareth
[November 07, 2018, 03:42:30 AM]