I don't know much about USB. I was thinking coming up with ONE cable with three connectors like the one I draw blow.
Code:
XDA -------USB (to laptop or ac adaptor)
|
|
GPS (the generic GPS connect).
NOTE: the ac adaptor output port is an USB port
it serves for three ways
a), XDA -> Laptop, charge and syn in the same cable, draws power from laptop
b). GPS -> laptop, draws power from laptop
c). XDA -> GPS, in this case, USB connector connects to the ac adapter and power both GPS and XDA.
I believe the XDA---USB cable can be purchased easily. I can break the cable and somehow insert the GPS connector. since GPS only used a power pin, two data pin, a ground pin, I figure I only need to find out how to get these four pin into the original cable.
My question is
1. do I need any USB-serial sort of convertor between the lines? Or it is ok to connect GPS(serials signal) to USB cable
2. The ac adapter was to power the XDA which I blieve is 6V, and GPS needs 5 V, is it OK?
3. anyone alreadys knows how to plug the four GPS pins to USB cable? would save me a lot of trouble.
It would be cool to have a cable connects between all devices. If you can care for a DC-AC convertor in your car, this set should solve all your problem anywhere.
help is appreciated.
Most GPS units are serial. The XDA does have serial, so you can use that. You only need to connect the ground and two data pins. Specified input power for the XDA is 5v.
You can see what I did with a cradle to make a car kit here:
http://www.mywirelessoffice.com/xda/carkit/
This is a pin spec and photo of the connector:
http://www.mywirelessoffice.com/xda/connector/
There is a source for bare connetors, I believe the link is here on the XDA-Dev site somewhere.
Re: XDA -> Laptop USB, GPS-> laptop USB, are they the
It is possible. But note:
1. I assume you are using a serial GPS (with appropriate wiring), then it is OK. USB GPS CANNOT be used.
2. USB sync cable is wired to tell XDA that USB sync cable is connected so as to "wake up" the USB port. In such case, I do not know wheter the serial port can be accessed. As such has not been done before you have to try before you know.
I would suggest you make a cable just for GPS use, and use another cable for sync/charge (this is quite cheap), unless you found that your original idea works.
pine said:
I don't know much about USB. I was thinking coming up with ONE cable with three connectors like the one I draw blow.
Code:
XDA -------USB (to laptop or ac adaptor)
|
|
GPS (the generic GPS connect).
NOTE: the ac adaptor output port is an USB port
it serves for three ways
a), XDA -> Laptop, charge and syn in the same cable, draws power from laptop
b). GPS -> laptop, draws power from laptop
c). XDA -> GPS, in this case, USB connector connects to the ac adapter and power both GPS and XDA.
I believe the XDA---USB cable can be purchased easily. I can break the cable and somehow insert the GPS connector. since GPS only used a power pin, two data pin, a ground pin, I figure I only need to find out how to get these four pin into the original cable.
My question is
1. do I need any USB-serial sort of convertor between the lines? Or it is ok to connect GPS(serials signal) to USB cable
2. The ac adapter was to power the XDA which I blieve is 6V, and GPS needs 5 V, is it OK?
3. anyone alreadys knows how to plug the four GPS pins to USB cable? would save me a lot of trouble.
It would be cool to have a cable connects between all devices. If you can care for a DC-AC convertor in your car, this set should solve all your problem anywhere.
help is appreciated.
Click to expand...
Click to collapse
Hallo!
As I understand it, the V_ADP-pins of the 22pin-connector of the ?DA are for +5V to power the device. What shall I do with the USB_VDD-pin when creating my own cable? Has it to be connected to +5V, or just in case I´d like the ?DA to switch on when connecting?
In addition to that, Do I have to connect all three pins (20, 21, 22) to +5V or is it enough to just connect one of them?
And: What I did not get clear until now, is GND for power and audio the same, are they internally connected? Or should I use different grounds for audio and power?
Many thanks in advance,
I came across this hub:
http://www.monoprice.com/products/p...d=1030702&p_id=9955&seq=1&format=1#largeimage
Looks pretty nice, all USB 3.0 ports, capable of supplying a 900ma of power to each port. Good for all sorts of things, not just a tablet being connected to the computer.
What I was wondering about this is would it be possible to open it up and short the data pins so that it is only capable of being a charging device? If so, it probably wouldnt even need a connection to a PC, just need to be plugged into the power adapter. I am wondering on this because if possible, that would mean when only using 1 port it (theoretically) would be capable of sending 3.8A out to the one device if the device tried to pull that much. Since the tablet would see the shorted connection it should at least try to pull 2A. Anyway, I just thought it would be a fun project to try and modify in this way. I will probably get it soon and attempt this myself, and might even look into beefing up the internal power circuit area to make sure it can safely send 3+ amps out one port if asked to. It would be nice to use this in conjunction with a pogo connector and finally be able to charge faster than the tablet drains while gaming.
EniGmA1987 said:
... Looks pretty nice, all USB 3.0 ports, ...
Click to expand...
Click to collapse
Nexus 10 USB specs "microUSB v2.0"
http://www.gsmarena.com/samsung_google_nexus_10_p8110-5084.php
Would you get value from USB 3.0 ports with a USB v2.0 interface?
To get the full USB 3.0 power of 900mA, the device has to be configured as a USB3.0 device. The hardware developer USB 3.0 command verifier tool is separate from the USB 2.0 one
I thought we had also verified the USB connector and the POGO connector are mutually exclusive in power terms, even if the charging circuit inside the Nexus 10 could be modified to accept more than 2.5A.
skally said:
To get the full USB 3.0 power of 900mA, the device has to be configured as a USB3.0 device. The hardware developer USB 3.0 command verifier tool is separate from the USB 2.0 one
I thought we had also verified the USB connector and the POGO connector are mutually exclusive in power terms, even if the charging circuit inside the Nexus 10 could be modified to accept more than 2.5A.
Click to expand...
Click to collapse
Sorry, I dont scour the threads in accessories every day so thats news to me. Besides, I dont even know what "mutually exclusive" is supposed to mean in relation to this. If the pogo connector has a USB end and draws 2A from the power adapter, why wouldnt it be able to draw 2A from any source capable of putting out that much power? Your trying to tell me that the pogo connector somehow signals it is a USB2.0 device? If thats the case it wouldnt be able to draw more than the 500mA. The regular power adapter has a USB output connector after all and it can send 2A just fine. This hub has its own power adapter and doesnt try to draw the full 3.8A through a computer connection. What is the difference between the power adapter that comes with the tablet and a hub that has its own PSU to output that much and more power?
and yes I know it wouldnt transfer at 3.0 data speeds since the tablet has a 2.0 port, but I wouldn't be using the USB port on the tablet. But why would the USB somehow signal that it will only send 500mA through the pogo connector?
EniGmA1987 said:
Sorry, I dont scour the threads in accessories every day so thats news to me. Besides, I dont even know what "mutually exclusive" is supposed to mean in relation to this.
Click to expand...
Click to collapse
Mutually exclusive: charge from POGO or USB, but not both at the same time
EniGmA1987 said:
If the pogo connector has a USB end and draws 2A from the power adapter, why wouldnt it be able to draw 2A from any source capable of putting out that much power? Your trying to tell me that the pogo connector somehow signals it is a USB2.0 device? If thats the case it wouldnt be able to draw more than the 500mA. The regular power adapter has a USB output connector after all and it can send 2A just fine. This hub has its own power adapter and doesnt try to draw the full 3.8A through a computer connection. What is the difference between the power adapter that comes with the tablet and a hub that has its own PSU to output that much and more power?
and yes I know it wouldnt transfer at 3.0 data speeds since the tablet has a 2.0 port, but I wouldn't be using the USB port on the tablet. But why would the USB somehow signal that it will only send 500mA through the pogo connector?
Click to expand...
Click to collapse
The POGO connector, although it connects to a USB port, is not bound by the USB specification for how much it can draw. USB chargers are available that can deliver up to 3A, but it's up to the device to request this much power.
The specifications for USB 2.0 of 500mA (and 900mA for USB 3.0) are for a power and data connection, but their is an added specification for power only of 1.8A (and 5A for USB 3.0). a hub will generally adhere to the power and data specification, while the USB PSU has no data functionality (this is determined by their being a short circuit on the D+/D- USB pair).
The reason a USB 2.0 device will not draw 900mA from a USB 3.0 port, is because it's the device that negotiates the connection, and as a USB 2.0 device, it will only request the 500mA maximum from the USB 2.0 specification.
Try to think of it this way: an incandescent light bulb will not be any brighter if you increase the power source current.
Ok, but you just said everything I was talking about. So when I modify the hub to get rid of the data connection, and not even connect it to a computer and just have its power supply connected, how would that be different than simply a normal charger? The tablet would be charging through its pogo connector, and it simply plugs into the hub with a 3.8A power supply. So it wouldnt have anything to do with any USB limits then right? Cause the hub is USB3.0 ports capable so it is not like a USB 2.0 hub that wouldnt have the proper internal circuitry to push the 3.8A I will be trying to draw.
EniGmA1987 said:
Ok, but you just said everything I was talking about. So when I modify the hub to get rid of the data connection, and not even connect it to a computer and just have its power supply connected, how would that be different than simply a normal charger? The tablet would be charging through its pogo connector, and it simply plugs into the hub with a 3.8A power supply. So it wouldnt have anything to do with any USB limits then right? Cause the hub is USB3.0 ports capable so it is not like a USB 2.0 hub that wouldnt have the proper internal circuitry to push the 3.8A I will be trying to draw.
Click to expand...
Click to collapse
If you short the D+/D- pins, you can then use the hub as a standard charger PSU, capable of delivering 3.8A.
The issue is that current gets pulled, not pushed. It doesn't matter how many Amps you provide, the Nexus 10 charging circuit is only capable of pulling a maximum of 2.5A. (datasheet for the charge circuit can be found here).
From earlier posts (in one of the POGO threads, I think), there were found to be kernel limits restricting the SMB347 charging to 2A.
I have a g2, but looking for a universal dock with separate connections for micro-usb and AC to allow for simultaneous fast charging and sync connection to a PC. Does such a thing exist?
Don't think so, since those 4 USB pins are all connected to the charger (2 for power +/-, and 2 to let the phone know about it's higher charging capacity), leaving no room for a standard usb connection any more.
Hi. I'm installing a Nougat based Archos Core 70 tablet, with a DAB radio usb dongle in my car, but I'm having trouble sorting out the power scheme.
I can't get it to boot on car ignition due to problems editing fastboot in Mediatek phones/tablets like the Archos. So I've removed the battery and replaced it with 4.2v direct from the car battery, intending to have it sleep/wake on ignition through usb power.
However my otg usb hub wont register a usb power input while being able to run the DAB dongle. I don't need the input to charge, only to signal Tasker to sleep/wake the tablet.
Can Tasker take any other signals from usb apart from power? e.g. when some device is plugged in, or even a usb switch that outputs data instead of power. If needed I can add a relay to a usb input that closes on car ignition so it's as if I was physically plugging/unplugging a device.
Thanks.