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Screen Tablet malarky => Build Logs => Topic started by: Rubatonk on May 19, 2016, 10:56:11 PM



Title: DIY Cintiq Companion [Design Phase]
Post by: Rubatonk on May 19, 2016, 10:56:11 PM
The Goal of this project of mine is to make something more refined than normal. my goal is to make a 15.6 inch graphics tablet that has a dedicated gpu, 8gb of ram, and an i5 or i7 Processor all contained within a compact case that is 13mm - 20mm thick

I have started working on the design and finding some of the parts im looking to use

Some features i know i want implemented is a touch screen panel for when im not using the pen and a screen rotate button for holding at different orientations

This is the initial design i made
(http://i.imgur.com/VjnkY5n.png?1)

the empty space to the right of the display i plan to put shortcut buttons and other things i might need like a pen holder/charger

I plan for it to have a large enough batter to last 4-6 hours of continuous use before have to re-charge

one thing i was not to happy about is i am losing active area real estate as the digitizer board is more of a 16:10 aspect ratio and i could not find a 15 - 16 in screen that could fit so a quarter inch of the tablet is unusable on the top and bottom. if you end up finding a display that would fit let me know and i'll see about using that instead.

The tablet im planning on using is the Huion Giano so that's a size of 13.8 x 8.6 in whereas the display is 13.6 x 7.65 in *note because of the displays bezel is makes the overall size 13.8 in


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Pesho on May 19, 2016, 11:10:51 PM
Some remarks about this project:

1 - You need rounded corners and soft edges to make it comfortable to carry around. Most tablets nowadays are designed with this in mind.

2- Perhaps it's a bit smaller, but consider using a 14'' screen from a Toshiba Tecra M7. It will make your tablet much slimmer and you will be able to use a full 16:10 aspect ratio with no dead space and a resolution of 1440x900. The same LCD+Digitizer can be found in Gateway M285 laptops.


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 19, 2016, 11:41:33 PM
Funny enough i actually have one of those gateways, however the reason for the 15.6 screen is me being able to use a 1920 x 1080 ips display, i have not made my final decision on the main board yet but i thinking on of 2 that i have, either an asus g53sx or an alienware m15x. however i do agree about the rounder corners i'm was already in the process of adding them, im planning on doing it in two sections for easy assembly, one section holds the digitizer board and the screen and the bottom second is isolated from the upper section to prevent heat transfer and interference.


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Pesho on May 20, 2016, 12:16:03 AM
There are some LCD modules that are 14'', IPS and 1920x1080 - check out this list (http://www.panelook.com/modelsearch.php?op=advancedsearch&order=panel_id&inch_low=14.0&inch_high=14.0&resolution_pixels=19201080&display_mode_lc_family=IPS&transmissivity=-1). If you already have one of those gateways you can just use the digitizer from it and stick it at the back of a new screen! Worth mentioning though, is that if you go that route you may need to modify the back of the LCD so that there are no metal chassis parts between the screen and digitizer.


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 20, 2016, 12:26:06 AM
There are some LCD modules that are 14'', IPS and 1920x1080 - check out this list (http://www.panelook.com/modelsearch.php?op=advancedsearch&order=panel_id&inch_low=14.0&inch_high=14.0&resolution_pixels=19201080&display_mode_lc_family=IPS&transmissivity=-1). If you already have one of those gateways you can just use the digitizer from it and stick it at the back of a new screen!

I actually have two of them but i've never used the digitizer part never had the pen so i dont even know if it works.

and i suppose i could do it as a 14 inch instead i'll just have to find a mainboard that can fit in it the alienware still might but if it does not i also have some hp dv7's, i'll just have to change the planned graphics tablet, however i do find the idea of it being lighter but as it is im predicting it to only be around 5 pounds at the most


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Pesho on May 20, 2016, 12:40:52 AM
TabletPC pens are interchangeable for the most part, doesn't matter if it's from a thinkpad, elitebook, portege or whatever. The modifications you'll need to do is remove the metal on the LCD and also align the digitizer a bit since it's 16:10 instead of 16:9. By the way, usually 1920x1080 displays use an eDP interface. I haven't dealt with eDP so i can't tell its interchangeable, or if your alienware board supports it... If it does and is compatible, you may not need an HDMI-to-eDP controller.


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 20, 2016, 12:53:08 AM
Yes generally they are interchangeable, i work as a computer technician and screen replacement is one of our most popular services, even with completly different resolutions. Since im just using a laptop display it is quite literally plug and play, infact the panel i was planning to use is an ultra slim so it does not even have the metal shielding on it


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 20, 2016, 07:34:24 AM
Just bought a pen for the gateway's to see if they still work if they do i might use them for prototyping.

for the finished product i plan on using aluminium for the chassis but for now ill just use 3d printed plastic. i also had an idea that would make the bezel's slim, if the digitizer board on that Huion Giano is the way im hoping i might be able to modify it to cut down on used space.


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 20, 2016, 05:16:30 PM
Ok so i've continued on with the design i still dont know what motherboard ill be using so its not pictured yet but i do have most of the main structure of the body made

the bottom cover will be secured by a screw in each corner to allow easy access to the components below, the Cover will also function as the mounting point for a vesa mount or stand,
(http://i.imgur.com/TXbew8L.png)

there is a division in the chassis that separates the display and digitizer board from the rest of the device, i have not yet determined where the pass through's will need to be for the cables. the keyboard tray is an idea i have, granted this will have usb ports i dont want to have to carry a keyboard with me everywhere i go so i can put a tray that will hold the keyboard in place and it will fit nicely between the motherboard and the division. the center division is dual purpose not only does is prevent the motherboard from interfering with the digitizer board but it also add to the structural integrity and will help use the chassis as a passive heatsync.
(http://i.imgur.com/Yy6Bydw.png)

thats pretty much all i got for now, let me know if you have any ideas i could implement


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 20, 2016, 09:41:40 PM
Ok leave it to asus to make a motherboard that is exactly what i need http://www.amazon.com/dp/B00HGO7GXM/ref=pd_lpo_sbs_dp_ss_3?pf_rd_p=1944687742&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B00840BACU&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=04Z6P9HN42HZ9SVPHGX8

That there is a ultra slim motherboard that just so happens to have a lvds connector, To be honest this makes things a whole lot easier as it will allow me to use a intel i5-4570T and up to 32gb of ram :o

By tomarrow i'll have some new designs made up for it with that motherboard


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 24, 2016, 12:00:34 AM
Ok so i have decided to go ahead an scale the tablet down quit a bit, i wanted to make it 13.3 but i could not find any tablets that would work for that size so instead in going 11.6.

so with the new size's i remade the design and the total size is a whopping 16.3 inch diagonal which is an ok size to hold in my hand just wish there was not so much unused space around the edges.
(http://i.imgur.com/0SkFek0.png)

The ethernet jacks kind of f**ked me on the thickness so its 23mm thick, if i were to remove the jacks i could get the thickness down to 16mm
(http://i.imgur.com/Y8EmtCq.png)

i thinking about using a slightly different board if i find it, it's basically the same board but with a mxm 3.0b socket so i could use something like a quadro k4100m which would be awesome


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Pesho on May 24, 2016, 01:27:42 PM
Why do you insist on using bulky desktop tablets when there are tabletPC digitizers in the 13.3'' size you need? You even mentioned already having a 14'' one from a Gateway laptop, i don't get it... You're going for an "all-in-one PC" design from the looks of it, since there's no way you can power a desktop ITX motherboard with a battery or stick an adequate CPU heatsink there. But if that's the case, an 11.6 screen is terrible for an all-in-one...


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: XDjackieXD on May 24, 2016, 04:39:33 PM
To be honest I would gut an laptop for this project.
It has all or at least most problems solved for:
- battery operation
- thickness
- cooling
...

Would make your life a hell of a lot easier :P


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 24, 2016, 04:49:27 PM
what tabletPC screens are in 13.3 size? as for the 14 in screens i do have, the stylus arrived and they did not work, as for the issue of power that is not an issue its use's a 19.5v 7.7 amp power adapter which is a 150w power adapter thus the low power cpu from intel. there are 2 main reason's im building this instead of buying on already made. the first reason is cost to get a comparable tablet with an i5 an 8-16 gb of ram would cost upwards of $900-$1200, the other reason is im using this as a gateway to learning more about of the digitizer board work so i can eventually make my own. Hope that answers your questions.


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 24, 2016, 05:04:58 PM
To be honest I would gut an laptop for this project.
It has all or at least most problems solved for:
- battery operation
- thickness
- cooling
...

Would make your life a hell of a lot easier :P
I partially agree with you statement, the first thing i started looking for were laptop motherboards, however i did not like the limitations that they have. since im lucky enough to be able to work as a computer technician im able to know what commonly goes wrong with laptops and why they go wrong, whereas with desktop board's they are able to do things a bit differently, if the bios get corrupt you move a jumper and it re flash's itself, i like the general bios itself its more ease of use, as for the thickness, and Ethernet jack is an Ethernet jack they are the same dimensions on every computer with the exception of the ultra slim samsung which has the bottom part of itself fold into the chassis to remain slim when not in use. and as for the cooling i have plenty of heat sync's that will work


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 24, 2016, 08:52:53 PM
Why do you insist on using bulky desktop tablets when there are tabletPC digitizers in the 13.3'' size you need? You even mentioned already having a 14'' one from a Gateway laptop, i don't get it... You're going for an "all-in-one PC" design from the looks of it, since there's no way you can power a desktop ITX motherboard with a battery or stick an adequate CPU heatsink there. But if that's the case, an 11.6 screen is terrible for an all-in-one...
I apologize as now i understand what you were referring to, i dont know very much about the wacom digitizer stuff and did not realize that you can just buy a separate unit from a laptop and convert and use it over usb so i thank you because that will indeed make things way easier for me


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Pesho on May 24, 2016, 09:26:37 PM
TabletPC screens are the best choice since it's both a screen and tablet in the same unit, almost everything you need. Only downside is that they don't make them any larger than 14''.

Quote
what tabletPC screens are in 13.3 size?

BOE/HYDIS HV133WX1-100  (used in Fujitsu Lifebook T900) - 1280x800 resolution. TabletPC screens are usually 12.1''. 13.3'' and 14'' exist, but aren't nearly as common. If you want higher resolution you're going to have to peel off the digitizer and try to adapt it to a different screen, as i mentioned previously. Worth noting is that most of those digitizers are pre-2010, so the aspect ratio is going to be 16:10 as opposed to the 16:9 that's common nowadays. There are newer-generation 16:9 digitizers like in the Fujitsu T902, but nobody here has any experience connecting them to USB.


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 24, 2016, 10:52:39 PM
for now ill go the route of using the t900 screen as it wont cost me an arm and a leg, however once the price come's down on the t902 digitizer ill make a unit with that

Quote
but nobody here has any experience connecting them to USB.
That means i'll eventually be the first XD, once i get more money or the price comes down ill pick one up and play around with it, currently they are $98 which saddens me. thank you for helping me with the design.

also

Quote
You're going for an "all-in-one PC"
indeed that is what im going for that is why i chose the motherboard i did, its a special standard called thin mini itx. while yes it is a desktop board it is designed specifically for All in one pc's granted not as thin as im planning how ever there is enough room for a heatsink such as one you would find on a laptop but a bit more heavy duty, i do also plan on designing a custom board to plug into the pcie slot so i can use an MXM 3.0b graphics card unless i can find a board that intel showed off in there product catalog that has the MXM 3.0b as part of the motherboard.

The MXM slot has become a standardized slot for highend gaming/workstation laptops for special low power gpus generally if you see any laptop that has a quadro m gpu is has a mxm slot to support it.


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 25, 2016, 12:28:17 AM
Ok i have once again remade the model with the t900 screen and i have to say it looks way better
(http://i.imgur.com/CvSGzcm.png)


And its now only 20mm thick and 15in diagonal :)

thanks once again to Pesho


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Pesho on May 25, 2016, 11:24:43 AM
That means i'll eventually be the first XD, once i get more money or the price comes down ill pick one up and play around with it, currently they are $98 which saddens me. thank you for helping me with the design.

Yeah, that's more or less how much those (now cheap) 4:3 screens would cost around 2011-ish. Back then it made sense to use a regular desktop tablet at those sizes, nowadays it's easier. In theory hooking up a T902 screen should be easier with it being eDP and most likely native-USB on the digitizer side, but you need someone to play around with one and discover what the pinout is...

Not a big fan of MXM as it's still incredibly rare and exclusively owned by Nvidia... If i were going for an ITX board i'd pick an AMD platform with a socketed CPU since you can upgrade both the CPU and GPU by replacing just one, more commonly available unit. I'm curious as to how the LVDS connector on such a board works, i've only dealt with dedicated controllers...


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 25, 2016, 12:34:42 PM
Quote
I'm curious as to how the LVDS connector on such a board works
well unfortunately it use's the intel integrated graphics only for the lvds connector so its just like an normal onboard display, however with the MXM it can use it as a video source if it is built in, with an mxm card it sends the display signal's through the socket itself whereas normal graphics card do not which make a really cool technology, im currently working on two things. im working on a possible pcie 4x to MXM adapter that has the edp/lvds connector and the board it plug's into im just working on figuring out the pin out since nvidia only give's the information to the board partners. another thing im working which is my priority is the battery charging circuit which is currently hurting my head a bit. why do i do these things before i drink a pot of coffee :(


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: XDjackieXD on May 26, 2016, 01:27:16 AM
Quote
but nobody here has any experience connecting them to USB.
That means i'll eventually be the first XD, once i get more money or the price comes down ill pick one up and play around with it, currently they are $98 which saddens me. thank you for helping me with the design.

You will probably not have any problems with the USB digitizers if the Windows drivers work. I got 2 penabled USB digitizers here and both work out of the box with Linux (you just need a 3.3V regulator and some wires). Certainly a lot less of a problem than serial ones...


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: XDjackieXD on May 26, 2016, 01:32:56 AM
Quote
I'm curious as to how the LVDS connector on such a board works
well unfortunately it use's the intel integrated graphics only for the lvds connector so its just like an normal onboard display, however with the MXM it can use it as a video source if it is built in, with an mxm card it sends the display signal's through the socket itself whereas normal graphics card do not which make a really cool technology, im currently working on two things. im working on a possible pcie 4x to MXM adapter that has the edp/lvds connector and the board it plug's into im just working on figuring out the pin out since nvidia only give's the information to the board partners. another thing im working which is my priority is the battery charging circuit which is currently hurting my head a bit. why do i do these things before i drink a pot of coffee :(

The mobile GPUs usually don't have any screen output (at least the ones I encountered didn't) as the video signal gets passed back to the integrated Intel GPU via the PCIe bus. I just built an Expresscard to PCIe adapter today and connected a full featured GPU to my laptop and I can install the nvidia optimus drivers and use them as if it were a built-in GPU ^^
(hint for a lot of know-how for PCIe releated stuff: https://duckduckgo.com/?q=site%3Ahwtools.net%2FPDF&t=canonical&ia=web this company doesn't know how to secure internal documents and they are worth gold - or at least a good amount of time not wasted on trial and error :3)

EDIT: apparently I only saw mPCIe x16 for laptop GPUs but never a MxM card. They do have LVDS and DP according to the documentation... ._.
This may be useful for you: http://www.zentrica.com/wp-content/uploads/2014/04/HD7970M-MXM-3-0-SPEC.pdf


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 26, 2016, 02:34:11 PM
yes for the mxm card i was able to find documentation on a random chineese website that stated is that they send the display signals through the pcie, so even though they dont have the output itself on the card's i can build a midway card that has the video out port on it that i could then use.


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: XDjackieXD on May 26, 2016, 06:12:42 PM
What CPU and CPU cooler do you intend to use? This motherboard takes CPUs up to 95W TDP which is a lot for the planned dimensions...
Maybe you could try to use the cooling solution of an older "Gaming" laptop?


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 26, 2016, 06:54:14 PM
Im planing on using an intel i5 4670t as for the gpu that depends on if im able to make the MXM to PCIe adapter. if i cant then im stuck with the intel integrated graphics, however if i can i want to use a quadro k4100m

Quote
Maybe you could try to use the cooling solution of an older "Gaming" laptop?

Precisely what i was planing on doing for prototyping purpose's, however in the end im going to make my own as i am fortunate enough to have access to a CNC machine.

i have not posted much of an update because im hurting my head designing the power/battery charging board, the battery i sourced is one used in the alienware m14x. its a 4 cell battery so it a pain since i have to adapt the balancing circuit but since its a 63wh battery its perfect for this build and then i also plan to use a M.2 SSD and if there is enough space a second SATA SSD


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 26, 2016, 07:38:29 PM
This is an over simplified schematic of what im making

(http://i.imgur.com/w6NU73q.png)

as you can see when it is plugged in the battery will charge while the system is still getting power and once is unplugged the battery supply's the power

im going to use the Texas instruments BQ24707a controller chip so it is easy for me to program it


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: XDjackieXD on May 26, 2016, 09:15:24 PM
For battery charging you could take a look at the novena open hardware laptop. they have some pretty cool circuitry there and use standard LiPo batteries used for RC vehicles (high capacity, low weight and very cheap to get).


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Ertew on May 26, 2016, 10:57:21 PM
Ok i have once again remade the model with the t900 screen and i have to say it looks way better

And a lot more space for battery.
Btw, My T5010 screen looks same as T900, except T5010 is glossy while T900 looks mat.


This is an over simplified schematic of what im making

(http://i.imgur.com/w6NU73q.png)

as you can see when it is plugged in the battery will charge while the system is still getting power and once is unplugged the battery supply's the power

im going to use the Texas instruments BQ24707a controller chip so it is easy for me to program it
Lower diode is useless. In that configuration You can charge battery but cannot power the mobo.

IMO making good charger/balancer for Lithium batteries is too complex to deal with it. The better way are to use simple components and connect it together like puzzles.

If You want to go that way, BQ24707a is good choice to be a charger controller and maybe capacity counter but need another uC to manage charging states and cut-off.
Don't forget to add balancer. Simple balancer for RC things is very good as long as You can disconnect it after charging - probably You need a set of relays powered from input power supply.


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 26, 2016, 11:09:13 PM
The main issue im having is i only understand part of what i need to create the power circuit, this is the schematic i want to use for this but i dont know what the host is, as in the SMBus, dig I/O, or ADC or how i can connect to it through these things to program the voltages
(http://www.ti.com/ods/images/SLUSAL0A/sch2_schottky_lusaL0.gif)


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Ertew on May 27, 2016, 12:26:51 AM
To discharge good lithium battery You need to know overall voltage, divide by number fo cells and cut-off load (computer) from battery when voltage drop do much. It's nice to calculate remaining capacity of battery and measure actual voltage, so OS can display battery status and remaining working time.
When You have bad quality battery, each cell may have different capacity. In that case You need to know all voltages and do calculations for worst cell.

To charge You to do same thing plus balance the packet. Charging should be constant current as long as all cells are below 4.1 or 4.2V for Li-po/Li-ion (there are LiFe / LiFePO4 with different voltages). When voltage rise to that level, You need do decrease current step-by-step as long as You go to some minimal current (usually 1/10 of charging current or C/10). What when one cell have more than 4.2V and other less than 4.0V? That's situation when balancer put small load on all cells with voltage above specified level. In that situation charging current should be decreased and charding should be slowly finished - cells with lower capacity have higher voltage so takes no current (charging current flow through balancer, not through cell) while cells with higher capacity have lover voltage and were charged up to full voltage.

Too high or to low voltages, to high current or temperature and battery may blow up or catch fire. Too complex for me to make it safety. You should have the same opinion.


Next part is power management - how to not exceed total input current while CPU running and battery charging, how to fast switch between supply and battery, avoid charging while working from battery (decrease cells life a lot), etc...
Seems harder to implement, but doing it wrong cannot destroy battery.



I'm planning to build my own tablet, but with 20-30W total power consumption (most power goes for rPi and backlight) of the shelf solutions should be more than enough.
I have batteries for ST5111/ST5112 (huge capacity and still good after years) and charger for it. Everything should fit into case. If not, i need bigger case.


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 27, 2016, 01:06:00 AM
the battery im using is a 4 cell from the dell m14x type PT6V8 made by samsung. each cell voltage at max is 3.7v and the min is 3.3v, nice balance between capacity and reliability and its super slim. Computers are 12v so that is 7v that can be used for the battery charging. i chose the controller chip i did because i can program the batterys min voltage and max voltage so i dont over or under charge the battery. my only set back with it is that i dont know how to set up the interface to program the chip. texas instruments has a nice program for it they just dont explain how to connect it to the pc. i've never gone this extensive with circuit boards and such, the most i've done is replace a capacitor or resistor, and once a bios on a laptop so this is new ground to me but its a nice place to learn


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Ertew on May 27, 2016, 11:14:28 PM
If You use typical laptop battery, many problems will disappear:
- Laptop batteries always have controller that cut-off battery if anything is wrong with cells. That's very safety solution.
- Controller always can talk with MoBo via SMB. In Your design, You can read full and remaining capacity, voltage, current, temperature, remaining time, etc... That's very easy to implement.
- Laptop batteries usually have 'good' cells. (By that I mean that whole packet is balanced. Not the overall quality.) Because of that, cell balancing wasn't a huge problem.

Things You still need to solve:
- Control voltage/current and terminating charging. Battery will cut-off at 4.3V and 3.0V/cell - safety but give short lifetime.
- Turn on/off battery. Yes, that's real problem. Some batteries gives 3v3 output trough serial resistor. Shorting this to GND or another pin will enable normal output. On the other hand, some batteries provide power output without tricks but You need talk via SMB to enable charging.
In my opinion, simplest way for You is to buy a 'laptop battery charger', something like shown on links below. If You have choice, chose official model or something dedicated for Your battery. Chinese universal models wasn't the best option.
https://www.google.pl/search?site=&tbm=isch&q=laptop+battery+charger&gws_rd=cr
http://www.diytrade.com/china/pd/6276264/laptop_battery_charger.html
http://www.aliexpress.com/item/Universal-External-Laptop-notebook-Battery-charger-with-2-different-universal-connecting-wires-connectors-NEW-ARRIVAL/528778258.html
http://www.aliexpress.com/store/product/Professional-Universal-External-notebook-Laptop-Battery-charger-with-whole-connectors-for-almost-all-the-laptop-batteries/203437_558891609.html
http://www.repower.cn/en/Products/product_44.html


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 28, 2016, 08:37:25 PM
Ok so after a couple days this the circuit that should work, the usb interface will terminate to 4 pins in case it is not just a simple usb connection like im hoping, still working on the pcb layout
(http://i.imgur.com/YWi7Uzu.png)


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Ertew on May 28, 2016, 10:04:33 PM
Schematic looks good, but I not have enough knowledge to approve it.

One thing that doesn't fit is the PAD3..PAD10 connector. Do You wand to connect battery there?
IMO battery have one or two negative terminals and same positive. Connecting all 8 terminals do supply pins wasn't good solution. Look for "laptop battery pinout" and You will see that laptop batteries have I2C/SMB on pins = You can talk with battery same as You can talk with the charger. Applying to this pins more than 5V was insane.
https://www.google.pl/search?q=laptop+battery+pinout&hl=pl&source=lnms&tbm=isch&gws_rd=cr
http://nathandumont.com/files/images/battery_pinout.jpg
http://www.gearhack.com/Forums/Computer/Notebook/Rebuilding_the_Sony_VAIO_PCGA-BP51_Li-Ion_notebook_battery_pack.files.hidden/PCGA-BP51%20interface%20pinout.JPG

_________________________________


As I see in datasheet, bq24725 give automatic supply switching, charging current regulation and charging cut-off at specified voltage.
Laptop battery should have cell balancing and emergency cut-off.
You still need some logic that can turn off laptop when battery voltage drop below certain voltage - it can be done at SMB controller that was connected to bq24725 and battery via I2C interface.


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 28, 2016, 10:27:55 PM
I figured i need to use 8 pads for the battery as  the battery has 4 positive wire's 4 negative wire's and a few other wire's that i dont what know are for.


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: XDjackieXD on May 29, 2016, 10:12:07 AM
I don't want to ruin your dreams of USB but the bq24725 only has I2C (the bus system used by SMBUS. SCL being serial clock and SDA being serial data).
Your computer should have this bus somewhere on the motherboard and connecting this controller to it should make it visible to the os via ACPI (if you are lucky. if not then there is some configuration of the chipset required).
Also I have to confirm Ertew's statement: Laptop batteries don't just have + and - connectors. at least two of the pins are data (probably I2C too. charging cycles and capacity are stored on an eeprom inside the battery) and most of them require a pin to be pulled to ground to activate the battery.
For example the battery charging and controlling is described on page 43 & 44 of this document: ftp://helpedia.com/pub/temp/uploads/ala_borbe/ACER/Compal%20LA-8241P%20QCL00-QCL20.pdf
(The diodes and resistors directly at the connector are for ESD protection)


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 29, 2016, 08:12:38 PM
many thanks for the information XDjackieXD and Ertew, im willing to accept any information you have to offer as im new to making my own boards


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 29, 2016, 08:18:50 PM
Also the motherboard has a com port on it does that help with the serial interface in anyway?


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Ertew on May 29, 2016, 08:31:46 PM
In most case, COM port not help but made things worse.

Every Wacom tablet need drivers.
ADB tablets are obsolete because apple drop ADB connectors.
Serial tablets are obsolete because Wacom include drivers for them up to Win XP. Win 7 and above cannot handle serial tablet in any normal way. You can install old drivers for Win 7 in compatibility mode but that trick may not work in some cases.
That's why WaxBee project exist.

Of course, if You have Linux, problem never exist and You can use serial port.


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: XDjackieXD on May 29, 2016, 08:39:11 PM
Also the motherboard has a com port on it does that help with the serial interface in anyway?
Not really for the battery controller or the tablet as serial wacom drivers for Windows >7 are virtually nonexistent.
Regarding the battery controller & battery you have the SMBUS lanes (SDA & SCL) somewhere on the motherboard (the 2 pins should also be on each PCIe connector iirc).
It is a bus system so you can connect many different peripherals to the same 2 lines
(each IC has it's own address. Therefore connecting different ICs is no problem but same ICs could be problematic as they have the same address).
In theory this should autodetect your battery controller and show it to the OS via ACPI as laptop battery and it's corresponding controller.


Title: Re: DIY 15.6 Cintiq Companion [Design Phase]
Post by: Rubatonk on May 30, 2016, 02:14:38 AM
I decided to take a break from the power supply board as i've spent 3 days on it so i refined the model a bit more so here are some renderings. Still have not yet decided on the stylus silo or the stand/visa mount yet. For the ethernet jacks im going to do what i've seen on many samsungs and make a little fold out piece so when its not it use it will look better
(http://i.imgur.com/haKdV4A.png)

(http://i.imgur.com/VMpogGJ.png)

(http://i.imgur.com/0rkgS5c.png)


Title: Re: DIY Cintiq Companion [Design Phase]
Post by: Rubatonk on June 03, 2016, 05:46:50 PM
Ok so this is the solution i came up with for the stand, its has a maximum angle of 150 degrees which should be a comfortable drawing position and of course it can be set to any position within 0-150 degrees
(http://i.imgur.com/YhBVzhP.png)


Title: Re: DIY Cintiq Companion [Design Phase]
Post by: thatcomicsguy on June 07, 2016, 12:34:35 PM
This looks like a cool design.  I'll be watching with curiosity to see how it goes.

Good luck!


Title: Re: DIY Cintiq Companion [Design Phase]
Post by: Rubatonk on June 07, 2016, 04:43:20 PM
Thanks, right now im just playing the waiting game for parts to arrive