Database Users

Wireless charging!

hey guys,
So i noticed 2 extra pins under the battery cover of my GN2 today! i looks like they are for wireless charging similar to what Samsung promised for the gs3. I don't really feel like waiting for the official wireless charging kit from Samsung so I'm going to attempt to make my own wireless charging back! I've seen videos like this before so i know it can be done! i have got the old inductive charger and back from my ancient palm pre so I'm going to give it a shot! just thought id spark up a bit of conversation about the topic and maybe learn a bit from some people who may already have done something similar!
I apologize in for the terrible grammar
thanks !

Isn't that for NFC? My original note had those and they matched up with the contact points on the battery cover and its nfc chip

imitenotbecrazy said:
Isn't that for NFC? My original note had those and they matched up with the contact points on the battery cover and its nfc chip
Click to expand...
Click to collapse
As you can see in his pic the Note 2 has two sets of pins... One set (the upper pins) is for the NFC that lines up with the battery cover and the other set (next to the battery) is "most likely" for wireless charging because I did my own mod for the S3 and it works perfect but until someone does it we don't know for sure??

that's NFC

guitarz said:
that's NFC
Click to expand...
Click to collapse
Just got it working! OMG this is sweet! haha tested it with some spare wires and it regonized that it was being charged wirelessly! now i just gotta make it look pretty and install it in the back panel of the phone! woo!

tomdroid3 said:
Just got it working! OMG this is sweet! haha tested it with some spare wires and it regonized that it was being charged wirelessly! now i just gotta make it look pretty and install it in the back panel of the phone! woo!
Click to expand...
Click to collapse
You do realize that we need pictures on that.

imitenotbecrazy said:
Isn't that for NFC? My original note had those and they matched up with the contact points on the battery cover and its nfc chip
Click to expand...
Click to collapse
nope thats just the top pins! the bottom ones next to the battery are for wireless charging i just got it working too!

Vulpix said:
You do realize that we need pictures on that.
Click to expand...
Click to collapse
hahaha well of course!! I'm documenting the whole procedure!

got some photos!!!

why didnt they advertise this anywhere

That is awesome....So how much would it cost if they were to sell a new back cover made for wireless charging?

cleankutazn said:
That is awesome....So how much would it cost if they were to sell a new back cover made for wireless charging?
Click to expand...
Click to collapse
The whole mod cost me $18.00 on my S3 so that's how much it costs for everything... It's real simple too! I KNEW those bottom pins were for charging but some people just kept saying both sets of pins were for NFC which would be WRONG.... :highfive: Follow this thread and you can get all the stuff on Amazon... You will probably need some of the stronger magnets though which are another $10.00 for 100 of them on Ebay...
LINKY:http://forum.xda-developers.com/showthread.php?t=1877191 Thanks guys for getting to this!!

can anyone clarify:
which pin is + and -
what is the max current (at 5 volts?)
and other than getting the correct voltage, is there anything else that a wireless charging back-plate would need to do? (I am thinking of making a simple one with a LM7805 + a diode and a coil)

I'm waiting for the official Samsung one. I hope it does 2A wireless charging ! hehe.

slapshot136 said:
can anyone clarify:
which pin is + and -
what is the max current (at 5 volts?)
and other than getting the correct voltage, is there anything else that a wireless charging back-plate would need to do? (I am thinking of making a simple one with a LM7805 + a diode and a coil)
Click to expand...
Click to collapse
magnetic fields only induce current when the field changes(think transformer). It's AC not DC.
Sent from my SAMSUNG-SGH-I717 using xda app-developers app

How long does it take to fully charge the phone? Because the palm's wireless charging module's output current is far lower than the samsung one as far as i knows.

It's limited in the kernel to .5A, optimally 6.2 hours.

xartic12 said:
It's limited in the kernel to .5A, optimally 6.2 hours.
Click to expand...
Click to collapse
What current? I thought current referred to electrons flowing down a wire. It is wire less.
Sent from my SAMSUNG-SGH-I717 using xda app-developers app

PaulF8080 said:
What current? I thought current referred to electrons flowing down a wire. It is wire less.
Sent from my SAMSUNG-SGH-I717 using xda app-developers app
Click to expand...
Click to collapse
Mate. Wiki how a transformer works. Its basically 2 coils set next to each other. The coil in the dock has current flowing through it and this creates a magnetic field. This local magnetic field pushes the electrons around in the coil we have put in the back of our phones and tadaaa! Current. Electrmagnetism into Electromagnetic induction. So we dont want more than 0.5A in the case coil.
By the way see http://forum.xda-developers.com/showthread.php?t=1951493 for 2 common solutions to the mod (soldered and non-soldered) my non-soldered solution works a treat.

marc.tulley said:
Mate. Wiki how a transformer works. Its basically 2 coils set next to each other. The coil in the dock has current flowing through it and this creates a magnetic field. This local magnetic field pushes the electrons around in the coil we have put in the back of our phones and tadaaa! Current. Electrmagnetism into Electromagnetic induction. So we dont want more than 0.5A in the case coil.
Click to expand...
Click to collapse
Dude, I am an electrical engineer. It's more complicated than that. Only changing magnetic fields generate electric fields that induce current in a wire. The current is AC. 0.5A makes no sense, to me.
Sent from my SAMSUNG-SGH-I717 using xda app-developers app

Galaxy s4 wireless charging?

So I just bought this wireless charging dock last night: http://pages.ebay.com/link/?nav=item.view&id=400461623073
And thought that this is all I would need in order to charge my battery. However, Now I'm worried I will need a battery door. Does anyone know git certain whether or not I will need a different battery door to use wireless charging (currently using the one that came out of the box) if so, where would I be able to find one at? Thanks in advance!
Sent from my SAMSUNG-SGH-I337 using Tapatalk 2

Samsung is releasing a battery door that's compatible. They haven't set a release date for it yet though.
Sent from my SAMSUNG-SGH-I337 using xda app-developers app

colts187 said:
Samsung is releasing a battery door that's compatible. They haven't set a release date for it yet though.
Sent from my SAMSUNG-SGH-I337 using xda app-developers app
Click to expand...
Click to collapse
Okay, thank you for the reply! Any idea how much it will cost?
Sent from my SAMSUNG-SGH-I337 using Tapatalk 2

I read $39.99 I think it was an article on cnet.com

Ghstudent said:
So I just bought this wireless charging dock last night: http://pages.ebay.com/link/?nav=item.view&id=400461623073
And thought that this is all I would need in order to charge my battery. However, Now I'm worried I will need a battery door. Does anyone know git certain whether or not I will need a different battery door to use wireless charging (currently using the one that came out of the box) if so, where would I be able to find one at? Thanks in advance!
Sent from my SAMSUNG-SGH-I337 using Tapatalk 2
Click to expand...
Click to collapse
Don't need to get a new battery door. That new Samsung door will actually be larger than the current one. Some/many cases won't fit.
Get this instead - wireless receiver that fits inside the stock battery door:
http://www.monsterwatts.com/Galaxy_S4.html

wified said:
Don't need to get a new battery door. That new Samsung door will actually be larger than the current one. Some/many cases won't fit.
Get this instead - wireless receiver that fits inside the stock battery door:
http://www.monsterwatts.com/Galaxy_S4.html
Click to expand...
Click to collapse
Have you personally bought from this site?
Sent from my SAMSUNG-SGH-I337 using Tapatalk 2

Ghstudent said:
Have you personally bought from this site?
Click to expand...
Click to collapse
I pre-ordered the one for the S4, after it was written up on Engadget. It hasn't been released yet, apparently, so I'm still waiting.
Here's the Engadget article. Some good things said about it in the comments:
http://www.engadget.com/2013/04/10/monster-watts-wiqiqi-slips-wireless-charging-into-samsung-galaxy/
The order site says that it will ship by May 31:
http://www.vivealive.net/WiQiQi-Samsung-S4-Wireless-Charger-Set-WQS4.htm

Well, I just bought it. Will review it when I receive it on the 31st.

I just went ahead and bought a $10 s3 qi receiver, hoping it will work but if not it isn't too much money down the drain. Will let you guys know how it works
Sent from my SAMSUNG-SGH-I337 using Tapatalk 2

I ordered a kit as well.
I hope it lives up to the hype.
Will report.
Sent from my SAMSUNG-SGH-I337 using xda premium

Samsung is terrible with the S4 accessories.. they release a new battery cover just to enable wireless charging.. ok fine.. but they release a stupid 70bux transparent flip cover that doesn't support wireless charging.. so basically i can never get wireless charging if i ever want to use their oem products or i need a special case if i want to use their oem wireless charging cover and fit?? real smart thinking.. guess i'll give this kit a try too

I thought it was the battery it self that has a coil in it for the NFC and that was for charging?
if not I have my palm pre still that has that wireless charging - could I take that battery cover apart and take that coil out and just attach it to the inside of the phone
I dont see anywhere where a battery cover with this built in will connect inside like it does on the palm pre, there arent any contacts that I can see that will go to the battery charting how would this work

leftkidney said:
I thought it was the battery it self that has a coil in it for the NFC and that was for charging?
if not I have my palm pre still that has that wireless charging - could I take that battery cover apart and take that coil out and just attach it to the inside of the phone
I dont see anywhere where a battery cover with this built in will connect inside like it does on the palm pre, there arent any contacts that I can see that will go to the battery charting how would this work
Click to expand...
Click to collapse
Are you sure you are looking at a GS4?
There are 4 contacts. 2 to the left and 2 to the right of the flash. I think the left ones are for charging. I am basically ready to do what you said but need to figure out the polarity of these contacts.
There are other related threads but no responses yet...
http://forum.xda-developers.com/showthread.php?t=2252949
http://forum.xda-developers.com/showthread.php?t=2295273
To the guy worrying about the flip cover - there are tons of wireless charging inserts on eBay. You don't need the Samsung back, just get one of those things and stick it under the cover.
Cheers.

I was browsing around folders and noticed these files.
Sent from my SAMSUNG-SGH-I337 using xda premium

Buy this receiver
https://www.fasttech.com/products/1355305
use coupon code CPASTE13SPRING for 5% discount.
I'm using S3 kit and my friend is using notes2 kit from them, (receiver and charging pad) and have just ordered this receiver to use in S4

You can put a wireless charging receiver card inside your S4. Now it is a very pop way to charge your phone. If you need any technical help, please PM me.
---------- Post added at 11:04 AM ---------- Previous post was at 10:55 AM ----------
wai_lai416 said:
Samsung is terrible with the S4 accessories.. they release a new battery cover just to enable wireless charging.. ok fine.. but they release a stupid 70bux transparent flip cover that doesn't support wireless charging.. so basically i can never get wireless charging if i ever want to use their oem products or i need a special case if i want to use their oem wireless charging cover and fit?? real smart thinking.. guess i'll give this kit a try too
Click to expand...
Click to collapse
get rid of your jacket, just a receiver card and a transmitter pad for S4 wireless charging solution. :laugh:

Ghstudent said:
I just went ahead and bought a $10 s3 qi receiver, hoping it will work but if not it isn't too much money down the drain. Will let you guys know how it works
Sent from my SAMSUNG-SGH-I337 using Tapatalk 2
Click to expand...
Click to collapse
I'm hoping yours worked. I've had a qi receiver in my S3 for about 6 months now. I pulled it out to see if it would work in my S4 and it doesn't quite fit. The pad would fit, but it lays over the sim card and mSdcard, which probably wouldn't be a big deal, but the problem is the two small brass contacts don't quite fit in the square charging holes on the s4, they're probably 0.25mm too large and slightly to far apart for the S4.
My S3 pad is about 6 months old though, so hopefully the newer s3 pads have been modified to work with both phones.
I love wireless charging though and just went ahead and ordered a qi pad for my s4 from the fastech link earlier in this thread.

acruxksa said:
I'm hoping yours worked. I've had a qi receiver in my S3 for about 6 months now. I pulled it out to see if it would work in my S4 and it doesn't quite fit. The pad would fit, but it lays over the sim card and mSdcard, which probably wouldn't be a big deal, but the problem is the two small brass contacts don't quite fit in the square charging holes on the s4, they're probably 0.25mm too large and slightly to far apart for the S4.
My S3 pad is about 6 months old though, so hopefully the newer s3 pads have been modified to work with both phones.
I love wireless charging though and just went ahead and ordered a qi pad for my s4 from the fastech link earlier in this thread.
Click to expand...
Click to collapse
Thanks for the response, unfortunately, the S3 Receiver was too bulky and wouldn't allow the door to shut.

This is what I bought and seems to work perfectly
http://www.amazon.com/gp/product/B00D0LTVLU/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

Does the part you place in the phone get hot? Causing NFC or other issues?

cant use NFC with qi charger installed

hi does any one know why i cant use nfc when my qi receiver installed in my gs4 ,the nfc works perfectly with it out ,there is no aluminium foil around receiver cheers

The NFC antenna is in the battery, which the Qi charger probably overlays.
You need an external antenna that connects to the second pair of pins, I don't know where you can get one though.
Sent from my GT-I9500 using xda app-developers app

why do some work and mine do not ,,i have seen many working....

westentertainer said:
why do some work and mine do not ,,i have seen many working....
Click to expand...
Click to collapse
It is hit and miss.... I find that its almost 50/50 chance of working when you want it to. Try running the nfc tag lower on the phone, not in the middle. Seems to work better for me...

NFC not working?

I have tried to use NFC on my brand new Note 3 today (SM-N9005) with my Nexus 7 and nothing happens when I open a website and put the two back to back? Which is supposedly how it's meant to work. Am I doing something wrong? or is my N7 or N3 faulty?
Btw: I have no NFC tags to test with (There in the post)
Thanks

Bump, I need to know what i am doing wrong, They're both using android beam

Sometimes one of the devices have to be upside-down...not sure if that helps but when using NFC on a Galaxy Mega and Note 2 one of them needs to be upside down. Not sure why.
Sent from my GT-I9505 using XDA Premium 4 mobile app

Check the inside of back cover , the NFC plate is missing , we only have connector but no plate.
Good Job Samsung.

In Note 3 NFC antenna is built in the battery. Mine N900 is working with one NFC tag I have.

sandsm said:
Check the inside of back cover , the NFC plate is missing , we only have connector but no plate.
Good Job Samsung.
Click to expand...
Click to collapse
The NFC coil is in the battery. The connectors are for wireless charging coil.
Sent from my SM-N9005 using Tapatalk 4

I'm not 100% sure my NFC is working. Only was able to use it occasionally when Google Wallet wanted to work on some vending machines at work on my Note2 and GS3. Now when I have NFC enabled and hold in front of the reader nothing happens. Going to order some tectiles with my 50% off coupon and see if they work or if it's the vending machine.

Hi. I have try to connect my Samsung Galaxy Note 3 to NFC Sony XB10 speaker but it cannot be undone. What do I need to do.

99% of batteries bought on internet do not have NFC, so if you need new battery, beware

[Q] question about wireless chargers

I am purchasing a Galaxy S5 next week and I am looking at the wireless chargers as that is the main reason I am upgrading my S3 in the first place. I have read that once placed on the charger the screen will read "wireless Charging" What I am wanting to know is if the phone is still on and if my wireless hotspot will continue to work in wireless charge mode?

macmovr said:
I am purchasing a Galaxy S5 next week and I am looking at the wireless chargers as that is the main reason I am upgrading my S3 in the first place. I have read that once placed on the charger the screen will read "wireless Charging" What I am wanting to know is if the phone is still on and if my wireless hotspot will continue to work in wireless charge mode?
Click to expand...
Click to collapse
Hi ! Your S3 can already have wireless charging if u didn't know ^^
Your phone will still be on(screen off ofc), and for hotspot, I'm 99.9% sure it works while charging
Sent from my SM-G900F using XDA Premium 4 mobile app

Safe0716 said:
Hi ! Your S3 can already have wireless charging if u didn't know ^^
Your phone will still be on(screen off ofc), and for hotspot, I'm 99.9% sure it works while charging
Sent from my SM-G900F using XDA Premium 4 mobile app
Click to expand...
Click to collapse
I kind of thought the hotspot would still be active, on the other note I had no idea the s3 was wireless charging. does that mean all it needs is a pad to lie it on? Not sure if I understand?

macmovr said:
What I am wanting to know is if the phone is still on and if my wireless hotspot will continue to work in wireless charge mode?
Click to expand...
Click to collapse
Yes it will. Or at least it does for me, so I don't see any reason it wouldn't for you as well. Your hotspot range may be reduced during wireless charging due to the RF interference, but if you had a strong signal before hand then you should be fine..
.

I've noticed no loss in wifi, hotspot or 3g performance while wireless charging, and the S3 and S5 can both use the same charging pad because they both QI compatible.

~7 dB effective attenuation when wirelessly charging my S5
Inferred from the increased 802.11N PER in an adjacent Asus RT-N66U router.
And consistent with decreased data throughput.
PER calculated from Ethereal capture.
Sample size = 5 x 10^3 packets
PER (packet error rate) is 1-(0.999^N), where N is the number of bits in the data packet
N = 32
NF transmit output = +17 dBm
.

macmovr said:
I had no idea the s3 was wireless charging. does that mean all it needs is a pad to lie it on? Not sure if I understand?
Click to expand...
Click to collapse
None of the S5 variants that I have seen will wirelessly charge by simply placing them on a charger. You need to add two things - the charger and a coil. The coil is the part that is inside the phone, a sort of receiver. The coil looks like a thick sticker and you can either buy an optional battery cover from Samsung that has a coil in it.. or add a third party coil to the inside of your existing battery cover. This is in contrast to say a Nexus phone where the coil is not optional - it is already built into all of the Nexus phones.
So it's odd to say that you are upgrading from a S3 to a S5 because of wireless charging.. when both the S3 and S5 need to have the same components added to add wireless charging. You seem to think that the coil is standard on S5's and it isn't.
Note that the optional Samsung wireless battery cover is thicker than the standard battery cover, which means that some cases will no longer fit your phone. And if you add a coil to the inside of the standard S5 battery cover, you need to choose a coil that is thin or you may displace the battery cover and lose the watertight seal.
.

fffft said:
None of the S5 variants that I have seen will wirelessly charge by simply placing them on a charger. You need to add two things - the charger and a coil. The coil is the part that is inside the phone, a sort of receiver. The coil looks like a thick sticker and you can either buy an optional battery cover from Samsung that has a coil in it.. or add a third party coil to the inside of your existing battery cover. This is in contrast to say a Nexus phone where the coil is not optional - it is already built into all of the Nexus phones.
So it's odd to say that you are upgrading from a S3 to a S5 because of wireless charging.. when both the S3 and S5 need to have the same components added to add wireless charging. You seem to think that the coil is standard on S5's and it isn't.
Note that the optional Samsung wireless battery cover is thicker than the standard battery cover, which means that some cases will no longer fit your phone. And if you add a coil to the inside of the standard S5 battery cover, you need to choose a coil that is thin or you may displace the battery cover and lose the watertight seal.
.
Click to expand...
Click to collapse
Thanks for straightening that out for me. Now I understand. Yes I am upgrading from a s3. I knew nothing about wireless charging until recently. Guess I need to get my nose into these boards more often. I am a road warrior and ran into usb port issues on my s3 in Denver a few months ago. I panic because I couldn't charge my phone, so I went to the closest 3rd party phone repair store and they sold me an extra battery and a external charger. That worked great but the fact that I had to swap batteries 2-3 times a day, left my phone without a case, and you know what happened next. So since my upgrade is tomorrow, it's time for a new phone and I am excited for the s5 anyway. Thanks again for the help,:good:

macmovr said:
I am excited for the s5 anyway. Thanks again for the help,:good:
Click to expand...
Click to collapse
No doubt you will love the S5. It's a significant upgrade from the S3, which was already a very good phone in it's own right. Enjoy
.