Bongofish
September 16, 2019, 08:31:14 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: You may have to login twice the first time,  but we don't know why - Erm I mean it's a security thing yeah that's it - security.
 
  Home Help Search Login Register  
  Show Posts
Pages: [1] 2 3 ... 5
1  Screen Tablet malarky / Tutorials and useful knowledge / Galaxy Note on: August 29, 2012, 10:55:44 PM
With the new galaxy note announcement today I was reminded of an experiment I ran a few weeks ago with the original galaxy note.  Any pen that will work on a penabled tablet pc will work on the galaxy note.  I tried it with both my m400 stylus as well as a surplus stylus I picked up on ebay for a Modbook.  It was a hassle trying to tell my friend to let me check because he was trying to tell me other styluses don't work on the phone (He didn't know anything about the Wacom digitizer).  But sufficed to say, if you have been avoiding one as an out and about sketchpad because the stylus was ridiculously small, fear no more.
2  Screen Tablet malarky / Heyaaaalpppp / Re: help! on: August 02, 2012, 03:38:46 AM
From watching the video he posted it didn't look like the tablet was recognized by windows at all.  I could be mistaken as the video isn't in English so it was a little hard to follow what was happening.
3  Screen Tablet malarky / Heyaaaalpppp / Re: 5 inch sensor board ? on: July 23, 2012, 03:47:05 AM
Yeah, Bernard mentioned to me that you had found a solution for the OQO; that is very awesome.  5 inches with a digitizer and onenote is my dream PDA.  What is this personal project of yours?  If you don't mind me asking.
4  Screen Tablet malarky / Heyaaaalpppp / Re: 5 inch sensor board ? on: July 20, 2012, 04:57:02 PM
I forgot one other computer that uses a 5 inch wacom digitizer!  The Thinkpad W700 or W701 has one in the keyboard!  You can occasionally find the parts separate on ebay.
5  Screen Tablet malarky / Heyaaaalpppp / Re: A few random questions on: July 20, 2012, 05:22:56 AM
So I will try to answer some of your questions, I'm sure Bernard will correct me if I'm wrong, but I will try to save him some typing.  It has been a while since I have been on the forum but I haven't seen a lot of success with non-wacom digitizers.  That being said, I want yours to succeed because cheap cintiqs are what this forum is all about. 
1.I'm not familiar with your controller board but the ones I have seen have an lvds connector at the end; it is possible your monitor will have the same connector (though I believe this is unlikely), otherwise you will have to solder the wires. 
2.I don't think the plastic is standard practice, they may have been trying to prevent a short of some kind.
3.I have seen double sided tape used to hold panels and digitizers together (many tablet pc's use this method.)
4.Yes
5.I'll let Bernard or someone else explain that.
6  Screen Tablet malarky / Heyaaaalpppp / Re: 5 inch sensor board ? on: July 20, 2012, 05:07:43 AM
So this thread is old, but maybe the original poster still frequents, it's been a long time for me.  The OQO 1 and 2 are the only other 5 inch wacom digitizers I have found (and I have looked extensively.)  It is important to note that the OQO 1 used a 4:3 aspect ratio and the OQO 2 used 16:9.  OQO 1's are rare but much cheaper when they come up.  I have a dead OQO 2 and an extra screen and digitizer I have been meaning to play with, but haven't gotten the chance. 

While there are no other 5 inch digitizers, there are at least two devices that use a 6 inch wacom digitizer: the entourage edge which can be had on ebay for around $80, and the BeBook (which goes by other names as well.)  I found this picture of the digitizer in the BeBook:
7  Screen Tablet malarky / Heyaaaalpppp / Re: OQO tablet PC digitizer on: May 17, 2011, 05:44:36 AM
Ive unplugged the whole screen assembly before while the machine was on, since they are all client devices its no more dangerous than unplugging a usb cable.  I would just unplug the end of the cable that attaches to the daughterboard.  Unless there is some danger to probing a live board with a multimeter other than shorting that I am unaware of I would also probably probe the ribbon directly as the traces are separated by a much greater distance and I can tape off all the traces but the ones Im testing that way I can eliminate the chance of shorting.  Maybe Im just not thinking it through hard enough (it is late right now), but do I need to find the ground first, or could I just ground it to a metal object away from the assembly?

Im glad Im not the only one who thinks this is exiting.  I was just happy when I figured out which 7 pins were used instead of having to go through 34.
8  Screen Tablet malarky / Heyaaaalpppp / Re: OQO tablet PC digitizer on: May 17, 2011, 05:03:29 AM
Yeah, I tried to find out what my multimeter was outputting.  I should have mentioned voltage was just my best guess based on some quick internet searching.  I actually have the ribbon cable for this connector already.  I'm not sure about the pitch on these pins I'll have to find something to measure it.  I'm not sure if I can solder that well, the ribbon cable has a couple of 90 degree bends and at those points the spacing is a little wider. 

I figure the digitizer probably runs off of 3.3v.  Couldn't I just use a couple of AA batteries?  I would think .3v would be within the acceptable margin.  I don't have a second multimeter, Ill see if I can scrounge one up.  None of the connections seem wider, I think it might share the power lines.  One test I might try is taking the meter to the motherboard while its powered, I just have to make sure to have the digitizer plugged in when windows starts and then unplug it otherwise it wont power it up in the first place.  Then Ill try by powering the digitizer alone.
9  Screen Tablet malarky / Heyaaaalpppp / Re: OQO tablet PC digitizer on: May 16, 2011, 10:48:58 PM
Last night was just a quick test.  I don't know the voltage supplied by the continuity tester on the multimeter.  I simply placed the multimeter into continuity mode and placed one probe onto a random pin of the connector at A on the diagram of the board then I placed the second probe onto the connector at B.  I then checked the pins one by one on connector B and found that pins 1-7 were the general area that showed a voltage of 500 (it doesn't give units, but my guess is that means 5 or .5 volts).  Pins 1-3 and 6-7 all showed the same voltage while 4 and 5 showed no voltage; simply displaying 1 on the meter.  It doesn't seem to matter which pin on A I connect the meter to, there is no difference in which pins show a voltage or the voltage shown.  When I applied the probe to C pins 31-34 showed the same voltage (500), and all other pins showed 1.  
[attachment=1]
10  Screen Tablet malarky / Heyaaaalpppp / Re: OQO tablet PC digitizer on: May 16, 2011, 06:16:10 AM
Well, I started poking around a little bit with the continuity tester; there is a chunk of 7 pins that seem to be the area of the rectangular connector that deal with transferring digitizer information.  When a voltage is applied to where the digitizer connects to the daughterboard 5 of the pins in that area respond with a voltage reading (2 pins in the middle of the 7 don't read anything).  When I tested the the touch scrollers; I got readings from the pins on the opposite side of the connector.  I couldn't find a good spot to test the ambient light sensor.

Now I realize this is fairly arbitrary, but it does give me a starting point.  I am pretty sure that I've at least isolated the group of pins that are responsible for the digitizer control, now I just have to figure out the signals.  I'll post a diagram of where the pins are I've identified on Monday. 
11  Screen Tablet malarky / Heyaaaalpppp / Re: OQO tablet PC digitizer on: May 15, 2011, 05:32:47 AM
Yeah, apparently I am leaving quite the digital fingerprint; I never could get those guys on DIYElectric to focus and pick a wheel motor design.  Picasso would be the guy to ask; he hasn't been replying the last few days as I need some info about the extra OQO motherboards he sent me.  Once he starts posting again, I'll ask him about it.  Tomorrow or Monday,  I will start prodding around with the continuity tester on the digitizer and see what I get.
12  Screen Tablet malarky / Heyaaaalpppp / Re: OQO tablet PC digitizer on: May 15, 2011, 03:49:48 AM
Well, the devices I have been thinking about are the dell streak, the villiv n5, or the sony UX.  All of these have a 5 inch screen either exactly or almost exactly the same size as the OQO.  The board itself is almost paper thin, and Im not really worried about mounting it behind the screen.  The daughter board could be a little difficult but still not muc space is required.  Even if I had to expand the cases a couple of millimeters, that wouldn't be too hard.  The UX has plenty of spaces, and from what I can find the streak looks doable, dont know enough about the villiv but people find ways to stick touch controllers and bluetooth in these palmtops all the time.  If the digitizer is usb than I can wire it to a port directly; people do it all the time to make external dongles internal and even the streak has usb host.  If it is serial, that is a little more difficult, and I will have to figure that out when it comes down to it.  As for drivers, android has them, but they aren't the best developed currently.
13  Screen Tablet malarky / Heyaaaalpppp / Re: OQO tablet PC digitizer on: May 14, 2011, 05:06:42 PM
I can at least report the chips on the wacom side of the board.  The first is the wacom w8001; I think this is the common chip for all tablet pc daughterboards.  There is a press release about it below but I couldn't find a datasheet.
http://www.wacom-components.com/english/news/20011207.html
The second chip is labeled wn101cf78 its a quad flat package chip (pins on all 4 sides).  I couldn't find any info on it, though I can apparently buy a minimum of a thousand from china.  The black box at the very top; just above the wacom chip is the ambient light sensor and I have no idea what the purpose of the metal clip or the white rectangle next to it would serve.
14  Screen Tablet malarky / Heyaaaalpppp / Re: OQO tablet PC digitizer on: May 14, 2011, 05:08:58 AM
So one complete disassembly of the OQO and the extra screen later.  I have to say, this machine is a feat of engineering, its like taking apart a silicon swiss watch.  It looks like they worked with their hardware partners VERY closely including Wacom.  Everything appears to be modular and fit together in the tightest way possible.  I don't think this thing could be made any smaller.

Here is what I have learned, the daughter board attaches directly to the digitizer at point A on your diagram like you thought.  Point B is where the cable to the motherboard connects.  Point C is one of the most interesting things on this board, it is the connector for the backlight; this board is also the inverter!  I find this especially interesting considering our problems with inverters and jitter. 

Here is the back of the digitizer, the back of the daughterboard has a small black "socket" where the touch scroll sensors connect.  It actually connects using pressure to hold the electrical connection together rather than snapping into place. 
[attachment=1]

After taking it apart it looks like the bottom of the board is dedicated to the inverter and the touch scrollers and the top of the board is dedicated to the wacom controller.  I tried to trace where the paths were going, but it was incredibly difficult as its a multilayer board.  I can see that they are consolidating into different groups though. 

I tried to get pictures of the silkscreen as well as the traces, but no luck with my camera.  I just have a sony point and shoot; any tips would be appreciated.  I don't think the silkscreen would be too helpful, as the whole board is simply labeled with a 1 or two letter code indicating the part type and number on the board.  Example: r4 for a certain resistor; none of the signals like tx are labeled. 
15  Screen Tablet malarky / Heyaaaalpppp / Re: OQO tablet PC digitizer on: May 13, 2011, 06:04:08 AM
Ok, I guess I haven't been clear.  Its a problem I have when I have thought things through a lot, I forget other people cant read my mind.  So, I have a full working OQO and an extra screen assembly (everything shown in that picture you embedded but with the digitizer cable plugged into that connector which is not shown in the picture).  I also have some extra dead motherboards that I am trying to repair separately; that doesn't really matter right now, as they are currently broken.  
Point C is the socket I was talking about, it is on what I will call the babyboard of the digitizer.  Yes Point A is the lcd connector and at D the sensor board connects with the babyboard.  I will get some pictures of what I have tomorrow, there is an additional metal plate backing on mine that is removed in the ebay pictures making it easier to see the connectors.  
The warranty on this thing has been out for a while, considering it is about 5 years old now.  I have to dissassemble the unit to clean out the fan, I might be able to keep it open long enough to sniff some signals, while connected to the motherboard; depends on how much my wife bugs me about having her computer.  I would only be sending power to the extra disembodied screen so Im not worried about the device; I wouldn't be trying this if I only had the computer to work with.

**You replied while I was typing my response: The babyboard is made by OQO but contains all the wacom chips to run the digitizer.  I will try to follow the traces on those other boards to see if I can find which pins on the ribbon they correspond to when I dissassemble it tomorrow.  Mostly, I am concerned with that final ribbon connector that goes to the motherboard though.
Pages: [1] 2 3 ... 5
Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!