I want to use a arduino Uno board with my tablet. The board has a direct power (not through the usb-port) and I connect the tablet with a micro usb cable through a usb hub to the board.
The IDE says however there is no board to be found.The same occurs when I connect the PC via a usb hub through a separate usb cable. When I use the fixed cable of the hub however it works fine. The problem is that this fixed cable cannot be connected to the tablet.
A USB hub only works in one direction. It has one "upstream" port which goes to the PC and several "downstream" ports that go to the peripherals. There is no communication between the downstream ports which is what you tried (I think).
Your tablet (BTW what tablet?) must connect to the upstream cable you called "fixed", and the tablet must be capable to be a USB host. Not all tablets can do this
It's not clear to me what you mean by the "fixed cable". I suspect that you just need a USB OTG adapter for your tablet.
olf2012:
Not all tablets can do this
I would say most cannot do it.
I have been looking for a tablet with USB host capability. Hard to find.
I have 4 tablets. Only the Nobis has it.
I suggest testing with something simple such as a USB keyboard first. If the tablet/phone supports USB host, it probably supports a keyboard. It may support USB host but not support USB serial (Uno). And you need a USB OTG to host cable.
Strange. I bought a $35 tablet, plugged in a $1 OTG adapter, and my mouse and keyboard work fine on it. I haven't tried anything else.
The hub has a cable attached. I suspect that olf2012 is right. Using this cable it works. Connecting through the usb ports in the heb doesn't.
I suppose a OTG adapter will work or is there a cable that has a micro usb plug on the tablet side and a usb printer plug for the Arduino?
pert:
Strange. I bought a $35 tablet, plugged in a $1 OTG adapter, and my mouse and keyboard work fine on it. I haven't tried anything else.
Which one?
The Nobis was sold by Staples but may be out of business.
It's the Digiland DL718M.
Thanks. I will look into it.
I had been learning how to write an app for Android smartphone that can make use of the usb port to "do stuff". LOL. One of the requirements was that the tablet had USB Host capability.
Apparently some manufacturers don't incorporate it even if the kernel supports it.
You should only ever plug the upstream port (the fixed cable, or the one with the B-type plug, depending on the design of your hub) of a hub into a USB host device or device acting as a USB host via OTG. You should not connect the other ports on a USB hub to a USB host device or device that thinks it's acting as a USB host via OTG. The design of USB cables was meant to enforce this physically, but with non-standard adapters you can make connections to USB devices that don't make sense.
ieee488:
=One of the requirements was that the tablet had USB Host capability.
Apparently some manufacturers don't incorporate it even if the kernel supports it.
Yeah, it raises costs - if you haven't noticed, there's been a bit of a "race to the bottom" in the tablet market.
I should say I'm not necessarily recommending that tablet. I don't have any other experience with these but certainly the performance isn't spectacular. That said, I've had it for some time now without any serious problems and OTG support is certainly a point in its favor. It's funny that it has a feature cut for cost savings since this was the cheapest tablet I found from a reputable domestic seller. It was a refurbished tablet. The one I got is this horrible "watermelon" color. I guess nobody wanted to buy that color because they were charging $5 more for all the other colors.