I've got a nexus 7 that I'm installing into a dash. I've bought an OTG Y-cable with power and a rosewill externally powered USB hub. I'm running USB-rom on the nexus 7. I plug everything in, power to the Y cable, power to the USB hub, and hub to the tablet. When I unplug the power from the USB hub it still remains powered on by either the tablet or the incoming power to the Y-cable. Is it possible the Y-cable isn't correctly wired for this setup?
There's a wiring diagram at http://forum.xda-developers.com/showthread.php?t=2113259 in with the pictures of an installation. AFAIK a USB hub will only get power via a dedicated socket and/or the host usb connection so if you've got a hub that accepts power from either source and there is a power source connected to the y cable then the dedicated hub power supply is redundant?????
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Hi friends,
I want to attach to my touchpad memory card reader and external hard drive.
I wonder if it will be possible instead of buying Y cable and connect it to the OTG, to use my existing USB hub and connect to him the devices and the external battery bank.
Will it work?
Thanks
avizov2 said:
Hi friends,
I want to attach to my touchpad memory card reader and external hard drive.
I wonder if it will be possible instead of buying Y cable and connect it to the OTG, to use my existing USB hub and connect to him the devices and the external battery bank.
Will it work?
Thanks
Click to expand...
Click to collapse
im assuming youre talking about doing this in android 4.0.x +. if so then yes you should be able to connect an externally powered usb hub to the OTG cable and connect more than one device at a time.
Thanks
haxin said:
im assuming youre talking about doing this in android 4.0.x +. if so then yes you should be able to connect an externally powered usb hub to the OTG cable and connect more than one device at a time.
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Click to collapse
Yes android 4.
to be precise, I don't have powered usb hub.
I have normal usb hub which I will connect him the power with usb battery bank device.
will it work?
avizov2 said:
Yes android 4.
to be precise, I don't have powered usb hub.
I have normal usb hub which I will connect him the power with usb battery bank device.
will it work?
Click to expand...
Click to collapse
Yes. You need to give power to the periphal usb devices. I tried the same yesterday, without problems.
Hey all
I have a powered Belkin USB hub (this one: http://www.belkin.com/us/F4U040-Belkin/p/P-F4U040), coupled with an OTG cable which I know work together, as my Kindle Fire recognizes all USB devices through this setup (Keyboard, Mouse, Flash Drive etc).
I was surprised to find that my HP touchpad does not recognize any devices connected to this hub.
I did some diagnostics with USB Device Utility, and the touchpad recognizes my USB OTG cable, as it shows as a 'Qualcomm On-Chip EHCI Host Controller'.
The touchpad simply does not see anything plugged into the hub, be it a keyboard, mouse or flash drive.
Please help me here, guys!
What am I doing wrong?
Thanks
MainCourse said:
Hey all
I have a powered Belkin USB hub (this one: http://www.belkin.com/us/F4U040-Belkin/p/P-F4U040), coupled with an OTG cable which I know work together, as my Kindle Fire recognizes all USB devices through this setup (Keyboard, Mouse, Flash Drive etc).
I was surprised to find that my HP touchpad does not recognize any devices connected to this hub.
I did some diagnostics with USB Device Utility, and the touchpad recognizes my USB OTG cable, as it shows as a 'Qualcomm On-Chip EHCI Host Controller'.
The touchpad simply does not see anything plugged into the hub, be it a keyboard, mouse or flash drive.
Please help me here, guys!
What am I doing wrong?
Thanks
Click to expand...
Click to collapse
Are you sure that's powered? The picture doesn't show any DC connectors. Is it powered by something like a mini USB to USB cable on the back? If so, that might not be enough to power the device and the peripherals attached to the ports.
Belkin Hub
Daistaar said:
Are you sure that's powered? The picture doesn't show any DC connectors. Is it powered by something like a mini USB to USB cable on the back? If so, that might not be enough to power the device and the peripherals attached to the ports.
Click to expand...
Click to collapse
The belkin does have an external dc power supply and is not powered via usb
I think you need a Y cable even with a powered hub as its purpose is to inject power back into the OTG chip in the Touchpad.
I want your experience in psu schematics.This is my plan, I will buy a cheap usb hub,,I will power it with dvd player smps 5V at the same time it will supply parallel to pi micro usb socket.My question is ,Do you cut the upstream power from usb hub when you are connecting the hub? do you left it as it is,,may be a diode is present.
PREMOLIKES said:
I want your experience in psu schematics.This is my plan, I will buy a cheap usb hub,,I will power it with dvd player smps 5V at the same time it will supply parallel to pi micro usb socket.My question is ,Do you cut the upstream power from usb hub when you are connecting the hub? do you left it as it is,,may be a diode is present.
Click to expand...
Click to collapse
While I can't answer specifics on what wires to connect I would recommend taking a look at this great guide to building your own PSU for the RPi http://elinux.org/RPi_5V_PSU_construction. This includes circuit diagram layouts.
Sent from my SCH-I535 using xda premium
I have my Pi powered from one of the normal USB ports. The power comes from the 'power' cable of the USB hard disk that is attached to the Pi. The hard disk's main USB cable is plugged into a powered USB hub.
Attached an image.
Do we need push more mA into her. mines running off my Tab2`s charger at the moment which is 2 Amps..??
lodger said:
Do we need push more mA into her. mines running off my Tab2`s charger at the moment which is 2 Amps..??
Click to expand...
Click to collapse
That should be enough amps as most phone and tablet chargers will provide the 5-5.6V of power needed for the RPi to function properly.
Sent from my SCH-I535 using xda premium
2A will be sufficient to power a couple of peripherils including pi itself.
powered USB hub...
Hey guys, it seems ive got power issues with my pi, everything works fine if i just use the two usb ports, but as soon as i plug in my powered usb hub i get keyboard errors, bluetooth dropping, and wifi connection issues, all symptoms of low power. anyone having this issue with thier Raspi & powered usb hub?
justanotherlurker said:
Hey guys, it seems ive got power issues with my pi, everything works fine if i just use the two usb ports, but as soon as i plug in my powered usb hub i get keyboard errors, bluetooth dropping, and wifi connection issues, all symptoms of low power. anyone having this issue with thier Raspi & powered usb hub?
Click to expand...
Click to collapse
Exactly how do you have everything plugged in?
Assuming power to pi from one source, hub to the USB port and your accessories all to the hub: See if you can get your pi to boot with the hub plugged in to the accessory port but nothing to the power micro USB.
I suspect the hub may be causing issues by backfeeding power through the accessory port. This test will tell.
powered USB hub...
cjdalessio said:
Exactly how do you have everything plugged in?
Assuming power to pi from one source, hub to the USB port and your accessories all to the hub: See if you can get your pi to boot with the hub plugged in to the accessory port but nothing to the power micro USB.
I suspect the hub may be causing issues by backfeeding power through the accessory port. This test will tell.
Click to expand...
Click to collapse
You guessed correctly to how i had it all set up. I did exactly what you said, tried booting, but got nothing. i dont think its backfeeding, any other suggestions? this one leaves me scratching my head.
justanotherlurker said:
You guessed correctly to how i had it all set up. I did exactly what you said, tried booting, but got nothing. i dont think its backfeeding, any other suggestions? this one leaves me scratching my head.
Click to expand...
Click to collapse
Are you using seperate power for usb hub ?If it is so you should cut the power terminal from usb hub to pi.See that you are supplying good current to the hub.
Found this cable on Amazon. This seller is in US and can ship faster I believe...
http://www.amazon.com/Micro-Cable-Power-Samsung-AtomicMarket/dp/B009YPYORM/ref=sr_1_cc_1?s=aps&ie=UTF8&qid=1357870142&sr=1-1-catcorr&keywords=otg+y+cable
Will this cable allow for powering a USB device while using the device? Also, will it permit charging the tablet while using the USB device?
Dale M said:
Will this cable allow for powering a USB device while using the device? Also, will it permit charging the tablet while using the USB device?
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Click to collapse
I believe you can power the secondary device, but without a custom kernel, you cannot power the tablet while OTG device is connected. I know someone made a kernel or two for the N7 but it will not work with our devices. Plus, with a pogo cable, you can just charge and OTG at the same time.
I added the usb host support and flash drive and mouse work great. I was wondering if a USB powered hub would charge the Nook HD+ when multiple devices are connected.
I don't believe it will currently charge while using usb host is on. One or the other.
interesting, thanks for the response.
If you're using verygreen's firmware, there's some tips (info from 4pda.ru).
In order to charge Nook you have to power up the Hub first, then connect a devices to the hub, then connect the Nook, then switch USB Host mode.
USB flash drive automount works only if the drive connected to the first port on the hub or directly to the Nook.
If USB device consume more than 100mAh of power than you must use the Hub (even unpovered).
I just bought a hard drive to connect to my nexus 10, but like an idiot, I didn't realize it was a USB 3.0 drive. I have an OTG cable. I am wondering if there is a way for me to externally power the hard drive. It has a single USB 3.0 female plug. Hopefully the attached picture can explain better what it is that I want to do.
I wonder if this would work
http://www.amazon.com/HDE®-Male-USB-Micro-B-Cable/dp/B006C0S2JS
I could connect the USB 3.0 connector (right-most) to the HD, the blue Type-A connector (left-most) to the OTG cable and the other USB (center) to a USB hub or power supply. Anyone have any experience with this type of thing?
MrGibbage said:
I wonder if this would work
http://www.amazon.com/HDE®-Male-USB-Micro-B-Cable/dp/B006C0S2JS
I could connect the USB 3.0 connector (right-most) to the HD, the blue Type-A connector (left-most) to the OTG cable and the other USB (center) to a USB hub or power supply. Anyone have any experience with this type of thing?
Click to expand...
Click to collapse
Did it work?