I'm looking for devices (Android tablets) which supports OTG (to connect slave-devices, e.g., a mouse) and charging at the same time
There was a thread about Nexus 7 https://forum.xda-developers.com/tab-s2/help/usb-otg-charge-t3588019
It needed a custom kernel to get OTG+Charging working
But it's very old, you can't buy a new Nexus 7 anymore
Also someone mentioned about Samsung tablets:
Samsung tablets for sure can support OTG Host/Charge for a tablet and peripherals. Here is a list of supported tablets:
Samsung Galaxy Tab A (10.1″)***
Samsung Galaxy Tab S2 (8.0″, 9.7″)
Samsung Galaxy Tab E (9.6″)*
Samsung Galaxy Tab A (8.0″, 9.7″**)
Samsung Galaxy Tab 4 (8.0″, 10.1″)
Samsung Galaxy Tab S (8.4″, 10.5″)
Samsung Galaxy Tab Pro (10.1″, 12.2″)
Click to expand...
Click to collapse
But these devices are also quite also and Samsung devices aren't that cheap anyway (if buying a new model)
So... Are there any devices (on sale) with normal prices which support OTG and Charging at the same time?
It doesn't matter if there is one port (input) or two (one for OTG and one for charging). Some Windows based tablets has a separate port for charging
Does Samsung Galaxy Tab A 7.0 (quite cheap) support OTG+Charging at the same time?
User848 said:
I'm looking for devices (Android tablets) which supports OTG (to connect slave-devices, e.g., a mouse) and charging at the same time
There was a thread about Nexus 7 https://forum.xda-developers.com/tab-s2/help/usb-otg-charge-t3588019
It needed a custom kernel to get OTG+Charging working
But it's very old, you can't buy a new Nexus 7 anymore
Also someone mentioned about Samsung tablets:
But these devices are also quite also and Samsung devices aren't that cheap anyway (if buying a new model)
So... Are there any devices (on sale) with normal prices which support OTG and Charging at the same time?
It doesn't matter if there is one port (input) or two (one for OTG and one for charging). Some Windows based tablets has a separate port for charging
Click to expand...
Click to collapse
What you need is a "powered USB hub", it has its own power supply and it will allow you to connect multiple USB devices(mouse, keyboard, flash drive, etc..) and charge the device at the same time by connecting your phone charger to the hub at the same time.
I use a USB to microUSB adapter, then connect the adapter to a USB hub that has 4 ports, then I use the adapter to connect the hub to the charging port on the device, then I connect a keyboard, mouse and phone charger to the USB hub.
Sent from my LGL84VL using Tapatalk
Droidriven said:
What you need is a "powered USB hub", it has its own power supply and it will allow you to connect multiple USB devices(mouse, keyboard, flash drive, etc..) and charge the device at the same time by connecting your phone charger to the hub at the same time.
I use a USB to microUSB adapter, then connect the adapter to a USB hub that has 4 ports, then I use the adapter to connect the hub to the charging port on the device, then I connect a keyboard, mouse and phone charger to the USB hub.
Sent from my LGL84VL using Tapatalk
Click to expand...
Click to collapse
It's not that easy with Android, believe me
User848 said:
It's not that easy with Android, believe me
Click to expand...
Click to collapse
With a "powered" USB hub, it is, but not with a standard USB hub.
Sent from my LGL84VL using Tapatalk
Droidriven said:
With a "powered" USB hub, it is, but not with a standard USB hub.
Sent from my LGL84VL using Tapatalk
Click to expand...
Click to collapse
There is no such hub... At least officially. You won't find much. I saw one hub, but users said it was working only with Windows tablet (OTG+Charging), for Android OTG was working only
just google "Android OTG+Charging" you you'll it's quite a problem
User848 said:
There is no such hub... At least officially. You won't find much. I saw one hub, but users said it was working only with Windows tablet (OTG+Charging), for Android OTG was working only
just google "Android OTG+Charging" you you'll it's quite a problem
Click to expand...
Click to collapse
Something like this won't do the job?
https://www.amazon.com/TUSITA-Adaptor-Charging-Adapter-Raspberry/dp/B00LTHBCNM
Or this:
https://www.amazon.com/dp/B00VK9C24M/ref=cm_sw_su_dp
Of course, the device must support OTG and the accessory charging feature. If it doesn't, I'm not sure there is anything you can do to force it.
Sent from my LGL84VL using Tapatalk
Droidriven said:
Something like this won't do the job?
https://www.amazon.com/TUSITA-Adaptor-Charging-Adapter-Raspberry/dp/B00LTHBCNM
Sent from my LGL84VL using Tapatalk
Click to expand...
Click to collapse
You have to test first
Does this hub supply a tablet with power or connected devices (slaves) to tablet? I need to charge a tablet and not connected devices (connected devices can get power from tablet)
User848 said:
I don't you have to test first
Does this hub supply a tablet with power or connected devices (slaves) to tablet? I need to charge a tablet and not connected devices (connected devices can get power from tablet)
Click to expand...
Click to collapse
https://m.youtube.com/watch?v=YDtc37u9Kvo
I also edited my post above to add more info.
Sent from my LGL84VL using Tapatalk
Droidriven said:
Of course, the device must support OTG and the accessory charging feature. If it doesn't, I'm not sure there is anything you can do to force it.
Click to expand...
Click to collapse
Well... manufactures don't give any information if their devices support all of this and what customers have to do to get it working (buy a specific hub or something else)
It's been two days and I only got reply from you. So we can say that it's not that easy and we can't be sure what to buy. I don't want to waste money if it's not going to work
Would be great if someone could really tell me which devices (tablets) support this feature, which hub should I get for such devices and so on
Did u have any luck with this?
I am looking for the same thing. So far I tested a fire 7 that did not work.
It seems like usb c tablets might be the answer. Seen a post that mentioned a version of the note working this way.
I might give the galaxy tab a8 a try.
I'm building a list of those known to work and not work: I can't post the link.
So far, these devices are known to support USB OTG and charging with an ACA cable:
RaspBerry Pi
Amazon FireStick
Amazon Kindle Fire 10???
Dell Venue 8 pro
HTC One M9
Lenovo Miix 2 tablet?
Lenovo Yoga Book
Moto G 4?
NuVision Tab 8 (Windows 10) after restart only?
Nvidia Shield K1 table??
OnePlus One
Samsung Galaxy S3
Samsung Galaxy S4
Samsung Galaxy S5
Samsung Galaxy Note 3
Samsung Galaxy Tab 4
Samsung Galaxy Tab A7?
Samsung Galaxy Tab A8.0
Samsung Galaxy Tab E?
Samsung Galaxy Tab S2??
Samsung Galaxy Tab S 10.5?
Samsung Galaxy View
Snes Classic
Devices which have a separate DC in power jack and support USB OTG (WIth any OTG cable, does't need ACA)
iRola 7" tablet. Very old.
E-Ceros Create 2 Tablet. Old
Ainol Q88. A newer version of this with Android7.1 and 1GB RAM is apparently still made. $53 It's said to support USB OTG (at least for a 3G adapter) and pictures clearly show a DC power jack, although the adapter may not be included. It is typically sold as a childs toy, but the protective rubber covering peels off to reveal a black plastic case.
Cube Talk 11 3G Phablet $85?
Raspberry Pi
Known to support OTG but NOT while charging: This limits OTG to either very short periods of use
Amazon Kindle Fire 7
Asus T100TAM
LG Nexus 5
LG Nexus 7
Samsung Galaxy Note 4
Samsung Galaxy S7
Samsung Galaxy S8+
Samsung Galaxy S9
Samsung Galaxy TabPro 10.1
JamesMNewton said:
I'm building a list of those known to work and not work: I can't post the link.
So far, these devices are known to support USB OTG and charging with an ACA cable:
RaspBerry Pi
Amazon FireStick
Amazon Kindle Fire 10???
Dell Venue 8 pro
HTC One M9
Lenovo Miix 2 tablet?
Lenovo Yoga Book
Moto G 4?
NuVision Tab 8 (Windows 10) after restart only?
Nvidia Shield K1 table??
OnePlus One
Samsung Galaxy S3
Samsung Galaxy S4
Samsung Galaxy S5
Samsung Galaxy Note 3
Samsung Galaxy Tab 4
Samsung Galaxy Tab A7?
Samsung Galaxy Tab A8.0
Samsung Galaxy Tab E?
Samsung Galaxy Tab S2??
Samsung Galaxy Tab S 10.5?
Samsung Galaxy View
Snes Classic
Devices which have a separate DC in power jack and support USB OTG (WIth any OTG cable, does't need ACA)
iRola 7" tablet. Very old.
E-Ceros Create 2 Tablet. Old
Ainol Q88. A newer version of this with Android7.1 and 1GB RAM is apparently still made. $53 It's said to support USB OTG (at least for a 3G adapter) and pictures clearly show a DC power jack, although the adapter may not be included. It is typically sold as a childs toy, but the protective rubber covering peels off to reveal a black plastic case.
Cube Talk 11 3G Phablet $85?
Raspberry Pi
Known to support OTG but NOT while charging: This limits OTG to either very short periods of use
Amazon Kindle Fire 7
Asus T100TAM
LG Nexus 5
LG Nexus 7
Samsung Galaxy Note 4
Samsung Galaxy S7
Samsung Galaxy S8+
Samsung Galaxy S9
Samsung Galaxy TabPro 10.1
Click to expand...
Click to collapse
Thanks for the summary. I am also looking for android tablets that support USB host and charging at the same. A few old tablets from LG and ZTE have both micro-USB as charging port and a full-sized USB port to host other devices. But they are quite old. So ACA cable might be the way to go.
Question: Do we need to patch android os as described here use ACA cable?
"You can lead a horse to water, but you can't make it drink."
You can always offer power to a hosting device.
Whether it takes it is another question.
If it's rooted you may find that you can control something to make it take it.
I've used back-powering hubs to power Androids.
This is a hub that has been modified to present power on the upstream port.
You can modify any powered hub to do this.
See: https://forum.xda-developers.com/showpost.php?p=25639514&postcount=8
Has anyone come up with any solutions to this problem? I see this thread is a year old but I am here with a samsung tab A 8.0 2019, I have the exact same problem. I need to an external usb in service while charging, not one or the other.
The use of a specific value resistor on the USB OTG ID pin to ground is pretty manufacturer specific.
Some devices have up to a 5 bit non-linear converter on the ID pin to give up to 32 modes.
I've found Samsung to be a fan of using the OTG ID pin.
I would definitely try values from short to 1 k to 1 M (in an exponential progression).
I don't even remember which device this is, but it gives you some idea of the values they might use:
Code:
0
2000
2604
3208
4014
4820
6030
8030
10030
12030
14460
17260
20500
24070
28700
34000
40200
49900
64900
80700
102000
121000
150000
200000
255000
301000
365000
442000
523000
619000
1000000
Open
If you're rooted you may be able to control the charge controller directly.
Some of this could be a pain if you were plugging/unplugging all the time.
If this is some hard-wired, fixed usage you could definitely hard wire your own 4 V charger into the battery.
You might try getting a few pots 10k, 50k, 250k and some 220k resistors to try your luck.
Whoever is reading this I can assure you that the Samsung tab A does not charge while OTG. Jamming a resistor in there to short out the sense pin is not a thing. These are pwm charging and have been for a while. Even after spending $100 on the OTG cable alone it's still not working.. rooting.. twrp.. none of It makes any difference at all
scampo77 said:
Even after spending $100 on the OTG cable alone it's still not working.
Click to expand...
Click to collapse
How do you even do that? An OTG adapter is < $5. A connector is < $1.
OTG adapters normally have the ID grounded right inside the connector so you can't use that unless you chop up the connector.
You need to make up your own micro USB connector.
The Samsung Anyway Jig
The Samsung Anyway Jig Summary: Some information and pictures of the mysterious Samsung Anyway Jig Skill Level: Medium ================================================== Do NOT post questions/requests on how to obtain one, they will not be...
forum.xda-developers.com
I don't have a Samsung Tab A so there's only so much that I can say.
All devices have a linear or DC buck converter that feeds USB power to the battery.
All devices (that do powered OTG) have a charge pump or a DC boost converter that feeds power to the USB jack.
Both of these are under control of the processor.
Look in your kernel source under usb/otg
You should easily be able to see if you have an ADC on your OTG ID pin or if it's just a GPIO.
Look at your device under /sys and see if there is anything suspicious with "adc" in its name.
Code:
find /sys -name '*adc*' 2>/dev/null
In worst case you'd have to modify a driver.
Y otg cable (replaced 4 pin micro usb connector with 5 pin micro usb connector) + 68k + 20k gives fast charging and data commuincation on Galaxy Tab A 2016 (SM-T585)
Renate said:
How do you even do that? An OTG adapter is < $5. A connector is < $1.
OTG adapters normally have the ID grounded right inside the connector so you can't use that unless you chop up the connector.
You need to make up your own micro USB connector.
The Samsung Anyway Jig
The Samsung Anyway Jig Summary: Some information and pictures of the mysterious Samsung Anyway Jig Skill Level: Medium ================================================== Do NOT post questions/requests on how to obtain one, they will not be...
forum.xda-developers.com
I don't have a Samsung Tab A so there's only so much that I can say.
All devices have a linear or DC buck converter that feeds USB power to the battery.
All devices (that do powered OTG) have a charge pump or a DC boost converter that feeds power to the USB jack.
Both of these are under control of the processor.
Look in your kernel source under usb/otg
You should easily be able to see if you have an ADC on your OTG ID pin or if it's just a GPIO.
Look at your device under /sys and see if there is anything suspicious with "adc" in its name.
Code:
find /sys -name '*adc*' 2>/dev/null
In worst case you'd have to modify a driver.
Click to expand...
Click to collapse
Woe woe woe!!! I had fully given up on this tablet and didn't check back here out of anger and frustration. I have a hard time getting any support.
I am having a hard time following your technical speak. How do I get into that menu? Are you willing to give me a hand with this? Those commands look like ADB??
The charger I purchased was from a company called "lava" you can find them easily online. It was a Y cable that was almost $100. It didn't work.