I am currently getting interested to the topic of bidirectional e-coupled technology in order to allow battery charge sharing between smartphones in an inductive way. I know that there are some solutions for the smartphone-charging pad method but none for the smartphone-smartphone approach. I therefore guess that the critical issue is to make the smartphone be not only a receiver but also a host in this receiver/host model. But I have no clue. Anyone knows how can I develop this solution?
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Hello all,
I'm new on the forum, so let's briefly introduce myself so you can understand better my question.
I am electronics designer, I work for an automotive electronics company providing oem electronics devices to car manufacturers.
I work on some products that shall be able to fast-charge "any smartphones" on the market.
I understood that most of the big smartphone manufacturers are participating to some workgroups to define a universal charger. These initiatives seems to rely on the "battery charging specification" from USB-IF.
But we are talking about AC charger here, there is no data communication and I guess it will use "DCP" profile from BCS. DCP is Dedicated Charger Port.
On my side, I would like to offer both fast-charge and data connection.
Then I plan to use CDP mode from BCS. CDP is Charging Downstream Port, it allows both data com and charging at same time.
This looks good by I dont have a clue if CDP mode is supported by smartphones and tablets on the market.
If anybody can confirm CDP support for some manufacturers or some models, I would appreciate a lot !
Best regards,
I would be very, very, very interested in knowing the answer to this question too. I think at some point wm6 phones could be hacked to draw more than 500mA from a USB port, but doubt modern OSes allow that ...
I thought it is a common question to ask how much current can a mobile device that supports USB host mode deliver at max, but I couldn't find any satisfying answer. I know traditional USB port on PC can usually deliver 500 mA at max, tablets or mobile devices that support USB host mode or OTG functionality may possibly cannot supply that much current.
Do you have any idea how much current a tablet, say Samsung Galaxy Tab, can deliver current at max? It may depend on brand and model. If so, can you please give me some examples?
I am gonna buy mobile RFID reader however, that module can draw current up to 500mA, around 2.5 Watts, and wondering if tablet can supply that much or not..
Any ideas greatly appreciated
Hello everyone. I've been considering a purchase of the Nexus 9 and was disappointed to to read that it lacks Qi wireless charging built-in. I've found Qi to be a very useful feature for many of my Nexus devices, from my old Nexus 4 and 7 to the modern N6, so it seems odd for it to be omitted for the N9. Thus,, if I end up buying a N9, I'll be interested in adding Qi charging capability.
Qi charging receivers seem to come in two forms: those that use the external micro-USB connector on your device and those that don't. Those using the microUSB connector have the obvious drawback of "taking up" said connector as well as possible issues with the detection of wireless charging , so I'd ideally like to use one of the models that doesn't use the micro-USB plug. These models (such as some of those made for the Samsung Galaxy S4 and S5) are completely internal and interface with the battery via other connection points, typically residing under the back cover of the device. An example can be seen here - http://www.fonesalesman.com/collections/qi-wireless-receivers/products/s5-slimpwrcard . I am guessing the viability/ease of install for such a receiver is dependent on the device model, so I was wondering if anyone had performed a similar modification on their Nexus 9?
Any ideas? Thanks!
So the Samsung phones were designed this way so they could sell you a separate case to add wireless charging. So it was designed to add it easily... I've seen something like this added to a non Samsung phone but it required some soldering and I'm sure lots of skill. I agree with you that qi charging seriously should have been in the tablet. At the very least some form of quick charging. My least favorite part of the tablet.
I've been wanting to get one of those game controllers for my LG G4, that the phone clips onto/fits into, but I'm unsure about the technology.
The ones I've seen fall into three categories:
Bluetooth. Most of the gamepads designed for phones seem to be Bluetooth (probably because it was available sooner). I really don't like the idea - in my experience, Bluetooth is super unreliable, and it seems awfully wasteful to use a power-hungry radio connection to an accessory that's physically touching the phone.
NFC. Seems like maybe less wasteful (I don't know how much power NFC draws, but I imagine it's less than Bluetooth), but I've only seen them for Samsung devices. Do they exist for other brands? Are they any better in terms of battery draw and reliability? Can NFC even be used for that sort of long-term connection or is Samsung doing something special to make it work?
USB. As I understand, on most phones today the USB port works as both a client (to connect to a PC) and, with the right cable, a host (to connect other devices to the phone)? So it should be possible to connect an ordinary USB gamepad? I feel like that would be the most reliable (no wireless interference) and efficient (no radio), though USB can be fairly power hungry too... Anyway I've never seen gamepads designed for phones that use USB, either.
So, do USB or NFC gamepads exist that are designed to hold a phone? Do they work with the G4? Which technology is better?
This is for any musicians who moonlight as android developers, or vice versa.
I searched for an answer to this question, but I haven't yet found an answer. Since this website has always been the best for model-specific android development, I thought I'd run this up the ol' flagpole and see who salutes.
I have long avoided joining the hipster ipad/iphone crowd for numerous reasons, including reasons that are purely emotional. That said, I have run into an issue that might send me over the edge to iOS. The issue has to do with MIDI implementation. Apparently, iOS has fully implemented MIDI into its operating system and device USB ports, which is something that Android did not do until version 3.1. Even though 3.1 has been out for some time, the hardware has taken a while to catch up because of latency problems and other frustrations.
Finally, current smartphones and tablets are capable of implementing real-time midi control through the USB port; however, it requires that MIDI is properly configured in the kernel. Since I am so unfortunate as to be a Verizon customer, I have my doubts whether Verizion has bothered to unlock the midi capabilities of the S6 via an OTG cable (if ever there was a stupid name for a host cable, but that is another topic).
Does anyone know if the Verizon version of the Galaxy S6 has fully implemented midi capabilities through the USB port? Until recently, I never had the need for midi control through my phone, but now I need to do just that. I would rather not have to buy an ipad to do what I want to do, but that might be my last resort. I had just upgraded my phone before the clowns at Guitar Center told me that only iOS has implemented midi, which I later found out was not true (sort of). The only people I trust less than the staff at most Guitar Centers are the truly lost individuals you typically find at a Verizon store, so I am posting this on the only board that has never steered me wrong when it comes to all things android.
Thanks for any help in this area anyone might be able to offer.
Trainwreck33 said:
This is for any musicians who moonlight as android developers, or vice versa.
I searched for an answer to this question, but I haven't yet found an answer. Since this website has always been the best for model-specific android development, I thought I'd run this up the ol' flagpole and see who salutes.
I have long avoided joining the hipster ipad/iphone crowd for numerous reasons, including reasons that are purely emotional. That said, I have run into an issue that might send me over the edge to iOS. The issue has to do with MIDI implementation. Apparently, iOS has fully implemented MIDI into its operating system and device USB ports, which is something that Android did not do until version 3.1. Even though 3.1 has been out for some time, the hardware has taken a while to catch up because of latency problems and other frustrations.
Finally, current smartphones and tablets are capable of implementing real-time midi control through the USB port; however, it requires that MIDI is properly configured in the kernel. Since I am so unfortunate as to be a Verizon customer, I have my doubts whether Verizion has bothered to unlock the midi capabilities of the S6 via an OTG cable (if ever there was a stupid name for a host cable, but that is another topic).
Does anyone know if the Verizon version of the Galaxy S6 has fully implemented midi capabilities through the USB port? Until recently, I never had the need for midi control through my phone, but now I need to do just that. I would rather not have to buy an ipad to do what I want to do, but that might be my last resort. I had just upgraded my phone before the clowns at Guitar Center told me that only iOS has implemented midi, which I later found out was not true (sort of). The only people I trust less than the staff at most Guitar Centers are the truly lost individuals you typically find at a Verizon store, so I am posting this on the only board that has never steered me wrong when it comes to all things android.
Thanks for any help in this area anyone might be able to offer.
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Im on 5.1.1 and there is no option for it like my Nexus 7.
Scott said:
Im on 5.1.1 and there is no option for it like my Nexus 7.
Click to expand...
Click to collapse
You might not see anything that is obvious unless you install an application that uses it and have an external USB-to-midi port connected. it isn't like the USB port that provides bi-directional communication. Midi is strictly 1-way and although midi information is digital, it is an analog signal that requires translation from USB via an external port. These are fairly common and are relatively cheap. BUT, by my understanding, in order for android to even see the port requires that midi is turned on in the kernel properly. I just ordered an OTG cable (actually an external OTG adapter) so I intend to give it a try as soon as Amazon delivers it. I have seen other people that have used midi with a Nexus phone, but not with a Verizon S6. From my past experience with Verizon, I am pessimistic about my chances. The only other option would be if I could root the phone and then install a new kernel that has midi turned on, but apparently Verizon has made that problematic as well. I will hold off on cursing Verizon much more until I confirm that they are the user-unfriendly company I know them to be.