help with USB and tethering/charging.

[glunday]

So basically im trying to make a door control pad, i know really nerdy but it seems cool as hell. so basicly i have decided to use an android tablet as the touchscreen, it's a cheap (40$ for a tablet from amazon vs 50$-60$ for the touchscreen kit shipped from china.) and capable way to implement a touch screen plus it has the added benefit of being able to be used as a tablet if your not useing it for another project it also is extremely thin compared to the screen+controller board combos on the market and you can have the pi somewhere away from the screen. so now that that's all out of the way im planning on connecting through usb tethering as described HERE . my question before i go out and start buying hardware is can i connect just the data wires between the PI and tablet and connect the ground and 5V+ to a separate power source so that it can pull all the power it needs to keep the tablet fully charged in use in a permanent installation. i assume for usb tethering to work all it would need is the data pins. any and all help is appreciated.

[glunday]

Bump

 

[dany_boy]

31 minutes ago, glunday said:

Bump

 

USB 2.0 data transfers works with a differential pair, so in theory (with fairly short wires and some shielding) you could get away with connection the data lines only. That being said, I would not bother to make such a simple project with a Pi and a tablet. A micro with a touchpad would be cheaper and easier to implement.

Cheers!

[glunday]

23 hours ago, dany_boy said:

USB 2.0 data transfers works with a differential pair, so in theory (with fairly short wires and some shielding) you could get away with connection the data lines only. That being said, I would not bother to make such a simple project with a Pi and a tablet. A micro with a touchpad would be cheaper and easier to implement.

Cheers!

not totally sure what you mean by micro and touch pad. but if you mean touch pad as in button pad it has to be a touch screen, kinda defeats most of the cool factor to just have a number pad and no touch screen/GUI

[glunday]

23 hours ago, dany_boy said:

USB 2.0 data transfers works with a differential pair, so in theory (with fairly short wires and some shielding) you could get away with connection the data lines only. That being said, I would not bother to make such a simple project with a Pi and a tablet. A micro with a touchpad would be cheaper and easier to implement.

Cheers!

not totally sure what you mean by micro and touch pad. but if you mean touch pad as in button pad it has to be a touch screen, kinda defeats most of the cool factor to just have a number pad and no touch screen/GUI

[dany_boy]

1 minute ago, glunday said:

not totally sure what you mean by micro and touch pad. but if you mean touch pad as in button pad it has to be a touch screen, kinda defeats most of the cool factor to just have a number pad and no touch screen/GUI

micro = microcontroller like an ATmega on arduino. If you want the cool factor that's fine. I just think that a pi and a tablet is like killing a fly with a shotgun.

Cheers!