I'm building a DIY tablet with Orange Pi & A20 SoC (maybe I will change for LeMaker Bass) & Android 4.2.2 (v.5 with Bass).
This is a 17.3' screen tablet. I already have a IPS screen, and all works, 4h30 autonomy
Anyway, now I'm looking for a cheap but quality solution for a touch screen. So, multitouch, and easy interface: USB is the better choice for me.
I have seen the "HP ENVY TouchSmart 17 t" touch screen. The others touch screen are about 180$, because not a serial manufacturing…
Here a pic of the PCB:
It seems that the chip is eGalax (so no problem for the driver: /drivers/input/touchscreen/usbtouchscreen.c), and the interface looks USB (CN1 ref VDD, D+, D-, Ground).
But, because of norms of USB which is VDD, D-, D+, Ground:
Here, D+ and D- are inversed… It distrub me a little.
So, my question: Does somebody can confirm this is really an USB device ?
Thanks
Edit: Here a second pic, but the PCB is a little different:
Best Answer
Some good news, after receive the touch panel (I had to try!)
The chip is Egalax 7920-SG11:
The internal connector is very very small, (4mm x 2mm), so I had to found another solution to plug the device. Hopefully, I have found !
There are some plots on the pcb, they are indicated: (thanks HP !)
So, I have soldered an old laptop screen cable (need small wires, each plot is 1 mm diameter) to each point, after checking each connection with a multimeter.
Then, the following is not hard. Here the result, and the Windows detection :)
Now, let's go on Linux and Android, the final destination. But it's another story...