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Does something like a Usb to bluetooth device exist?
I am talking something like as some example, USB keyboard > this device > bluetooth signal > Notebook or another device that allow Bluetooth use. 186.212.164.232 (talk) 23:56, 29 September 2022 (UTC)
USB to Bluetooth adapters are very common yes. But these are generally designed to plug into a host device, i.e. some sort of computer (e.g. desktop or laptop, mini computer like a Pi, tablet or phone or maybe a smart device like a TV etc) and provide Bluetooth support to said host device. For example, they could be used to connect a Bluetooth keyboard to a host which has a USB port but does not have Bluetooth (or an old version). While I only just glanced at your list, I fairly doubt it has what the OP seems to be asking asking for which from their description is something which can attach to a USB keyboard and output a Bluetooth signal to connect said keyboard to some other device with its own Bluetooth support (whether built or via a USB adapter).
I suspect theoretically you could do something like this with certain hobbyist devices maybe a Pi, but you'd probably generally get annoying latency. Note that this is likely a lot more complicated than it sounds since while I think USB HID is somewhat standardised, you'd still need to understand it enough to be able to connect to any random device, and then also be able to transmit the Bluetooth HID standard. Note that the adapter device would need some sort of power supply whether from the mains or a battery.
But anyway beyond the complexity, there's simply no reason for much demand for such a device. There are plenty of wireless keyboards out there for people who don't need Bluetooth and plenty of Bluetooth keyboards for people who do. And these are devices designed for such operation with built use of batteries (generally either an unremovable rechargeable one or one or two AA or AAA batteries). And the keyboards themselves are likely to be somewhat designed for low power which might not be the case for some random USB keyboard not to mention the power needed to parse USB HID and "convert" it to Bluetooth HID. (And I suspect the complexity is likely to mean even a specialised device by someone who knows very well what they're doing may still have latency issues.)
(In the audio field, there are quite a few different devices for connecting different things via Bluetooth but that's most commonly using an analog signal and there are reasons why this is a field where there's demand for a variety of different connection devices.)
Nil Einne (talk) 11:53, 30 September 2022 (UTC)