I've seen bluetooth keyboards about the size of a small TV remote:
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That size is perfect, but I'd really prefer USB not bluetooth. USB just works, and bluetooth just has pairing issues so often. I'm not looking for "large enough to touchtype on" but I am looking for QWERTY and basic shell and vi keys.
My usage would be for both Raspberry Pi and for Android. I did some web searches and found a ~4 year old forum post with a recomendation specifically for Pi use, but (a) that product is discontinued and (b) it was much larger anyway, more than twice as tall and twice as wide.
Anyone know of such a thing at a not-too-outrageous price?
That is not Bluetooth. It's 2.4GHz wireless with a USB-A 2.4 GHz receiver. You'd need a USB-C OTG to USB-A adapter, for the 2.4 GHz receiver, to use it with an Android phone.
The advantage of the 2.4 GHz devices is that no Bluetooth drivers are needed. They work fine with Android phones with none of the Bluetooth pairing issues, plus they use much less power than a Bluetooth keyboard, so you don't have to charge them as often.
The disadvantage is that you have to plug the USB-A 2.4 GHz receiver into the phone. I haven't seen any USB-C size 2.4GHz receivers so you have to use an OTG adapter.
Except that he explicitly stated that he wanted a _wired_ keyboard.
Part of the confusion is that what he really appears to not want is a Bluetooth keyboard. It is true that Bluetooth can sometimes be problematic in terms of pairing and also in terms of power consumption.
The link the original poster provided was not for a Bluetooth keyboard it was for a 2.4 GHz keyboard with its own receiver. In my experience These are much less finicky than a Bluetooth keyboard. There's no Bluetooth pairing required and it will work with most any Android or other device (except of course iOS devices with Lightning ports).
The upside of a Bluetooth keyboard and/or mouse is that there's no need for a USB receiver module.
I have a mouse that is switchable between 2.4 GHz and Bluetooth, and it comes with a 2.4 GHz receiver. But the mini-keyboards I've seen are all one or the other, and not switchable.
I have one very similar to that, it uses a USB wireless dongle rather than USB. It works ok, but is very small small and can be fiddly so only suitable for occasional use, like controlling a media player. You have to slow down repeating characters or it only registers one press. The one I have isn't backlit, but there are variants which are.
Slightly larger and much better solution is this one.
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It can be used with a wireless dongle or Bluetooth. The buttons are more comfortable to use, so can be used for small amounts of typing, although the layout is slightly non standard. Its backlit so great for using in the dark, other highlights are the scroll wheel, two finger gestures on the touchpad, and the left and right mouse buttons on top of the units.
A search shows 6,476 "courageous" phones that have the industry standard functionality of the 3.5mm jack which does many things which are _impossible_ do to without (just as an sd card does useful things which are impossible to do without).
This is a list of the phones that support the industry standard 3.5mm jack.
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Unfortunately the laughably primitive latest iPhones aren't in that list.
Hell, there's not even a _single_ iPhone ever made with a modern battery. And modern functionality of a fast charger is missing from the iPhone box. So are the missing headphones which made Apple tens of billions of dollars!
Nobody ever said Apple wasn't a MARKETING powerhouse of the finest order.
One by one, Apple's strategy is to _cripple_ the laughably archaic iPhone. So that you're forced to buy back basic functionality Apple has removed.
Apple removed the basic industry standard functionality of a wired headset. If Apple hadn't removed the basic functionality, there wouldn't be the need.
What headphones comes *in the box" with the latest iPhones, nospam?
they didn't remove any functionality. they simply switched to a digital headphone jack and included wired headsets in the box that plugged directly into the phone, *without* any adapters or dongles.
a. Apple's strategy is to slowly remove basic functionality - one at a time. b. Each year Apple gives a _different_ excuse for the loss of functionality. c. Yet, it's always so that you must _buy_ the missing functionality back.
Besides...
How did Apple "add" functionality when they _never_ had the in-device _portable_ storage capacity that almost all other phones have?
How did Apple "add" functionality when Apple _removed_ the industry standard 3.5mm jack which never negated bluetooth if people wanted it?
How did Apple "add" functionality by subsequently removing the headphones from the box which they needed to add when they removed the 3.5mm jack?
How did Apple "add" functionality when they then removed the charging brick from the box so now people have to shop for a proper fast charger?
How did Apple "add" functionality when they _crippled_ webkit so that it can't possibly have the privacy functionality of the Tor Browser?
The list can go on forever given the reason the iPhone is crippled in app functionality isn't the lack of hardware so much as the lack of the ability of developers to meet demand because Apple _refuses_ to allow them in the App Store.
Apple cripples iOS by preventing app functionality. There's a ton of useful app functionality on Android that isn't on iOS.
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