Hi I guess those plus a USB hub should do :-) https://pt.aliexpress.com/item/1005001499097554.html
Cheers -lev
On Tuesday, January 25, 2022 2:20:27 PM WET David Lanzendörfer wrote:
Hi Hagen
I'll need to design an adapter with multiple such connectors on it anyway, considering, that there will be multiple cams, so I won't need a computer, which actually has those on board, because I can wire it over USB, to the machine running the software. I'll also have to add the controller for the LCOS chip on there as well, so it will be just one or two USB plugs, and then probably a CentOS with the software. RedHat/CentOS is used in the industry, whenever Linux is required, because of the support contracts which are possible, so it will be easier to do marketing, when providing CentOS/RedHat images ready to be installed on any desktop machine you want.
Cheers -lev
On Tuesday, January 25, 2022 1:28:43 PM WET Hagen SANKOWSKI wrote:
Hello David.
Regarding the Mini-Computer, please look for flex-flat-cable MIPI CSI-2 connectors.
https://en.wikipedia.org/wiki/Camera_Serial_Interface makes it incredible easy to connect cheap cameras to them.
Nowadays always all small smartphone cameras using this (proprietary) Low-Voltage Differential Signaling (LVDS).
The Rasperry Pi was the first palm-size computer which got a MIPI CSI-2. I am sure, a couple of China Clones has this interface too.
Regards, Hagen.
On 1/25/22 12:55 PM, David Lanzendörfer wrote:
Hi I was thinking more along the lines of just having one robot arm, with a simplified low cost version of the wafer transport grab shown in the video you've linked. We could mount a small low cost CMOS sensor at the endpoint as well, and then use OpenCV to detect the presense or absense of wafers and making sure, the graber doesn't damage any of the wafers.
I'm going to buy a 3D printer soon (gotta hack some code for my day job first, in order to buy a proper one), and there's already simple robot arm examples on the web which I could simply print out and then modify them as needed. The grabbing part might however require being made from metal, which will require me to use one of those metal part prototyping services here in Portugal, which will probably increase the cost, so I'll try a 3D printed plastic variant first.
The advantage of a robo arm with a fork lift system is, that I only need one cassette, because the robot can just work slot by slot and put the wafer back after processing.
I could put another inexpensive CMOS sensor directly over the loading stage and use OpenCV to make sure that the wafer is properly placed on the stage. In general, I think OpenCV and cameras is a fantastic way to drastically reduce the amount of sensors required in the system, so we should make as much use of it as possible.
I'd be using some Mini PC like this one, for hooking up all the "webcams" (CMOS sensors) to, and then run all the software headless on there, as well as the Arduino(s) for the motion control: https://www.aliexpress.com/item/1005003020832871.html
Opinion?
Cheers -lev
PS: Today I got my Liberland passport. The greenscreen/chromakey background and the LCOS projector modules are still on their way.
On Tuesday, January 25, 2022 6:14:29 AM WET Hagen SANKOWSKI wrote:
Hello David.
The best wafer handling systems I know using the Bernoulli's principle https://en.wikipedia.org/wiki/Bernoulli%27s_principle and the manipulator arm has similarities to a forklift.
So I looked at youtube and found this clip :-) https://www.youtube.com/watch?v=BxkEfLpB3RU
Well, being cost-effective and reliable I'd suggest to use components similar to CD or DVD players. Their drawers mechanic is in principle all we need when the cassette always could stand vertically. Open up the drawer and slide into the cassette, grep the wafer onto drawer, slide out of the cassette while closing the drawer back into our instrument..
BTW, I would transport the wafer batches as seen many times with rail-mounted cages on ceiling.
Regards, Hagen.
On 1/24/22 9:05 PM, David Lanzendörfer wrote:
Hi Since I seem to have accidentally hit myself into the face while I was asleep, due to a nightmare, and now have a kind of swollen eye, I've put off recording my batch load video and went deeper into the research for example clips instead. During that research I realized, that the most common method for loading and unloading has shifted from rubber bands to full blown robot arms, and I was thinking, we could actually also use robot arms. I could actually 3D print that robot arm and control it with an Arduino: https://www.youtube.com/watch?v=_B3gWd3A_SI&ab_channel=HowToMechatroni cs
Opinions?
-lev
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