today more and more smartphones support wireless charging, whether it's out-of-the-box or via an available hardware upgrade (special back cover). but there is no reason why all other USB charged devices shouldn't enjoy the luxury of wireless charging.

in this instructable i'll show you how to add wireless charging capabilities to your smartphone (demonstrated on a Samsung Galaxy S II) or practically any USB charged device (of course i can't guarantee that it'll work on any device but i see no reason it shouldn't, unless there's some other patent or technology preventing it).

Step 1: Background and Clarifications

take safety precautions and do not do anything you are not certain of.
i cannot be held responsible to any damage you may cause to your device or to yourself !

(now, after i covered my ass, we can begin)

there are a few projects similar to this one on the net. I've drawn ideas from everywhere and incorporated some of my own.

the whole concept and basic design is based on Palm's technology (although there are other manufacturers offering similar solutions). the Touchstone is a Palm charging dock meant for the Palm Pre smartphone, which supports wireless charging via a separately sold back cover.

there are a few wireless charging technologies made by different manufacturers that all rely on the same physical concept but they are not cross-compatible, you cannot mix coils and docks (I've tried).

i will not bore you with the physics behind the concept (although it's quite interesting) and there's nothing i can write that's not already available with more professional descriptions on the net, so if you want you can google "wireless charging" and read all about it.
<p>Nice! I was super excited to see you used a Samsung Galaxy S II- Been wanting to get my hands on one of those to 'upgrade' my iPhone 4s. That being said, I've got a question: Do you still use this phone, and how well does it preform? </p>
Can you please teach us hoy to make byself a palm pre back,?
Very instructive and helpful, thank you for this article. I'm still an amateur in constructions like this one, but will follow every step as described, thank you again!
<p>Hmm, what about several small coils? If I understand the concept correctly, several small circles should, in theory, transfer as much energy as a singular larger coil. My Thought is try and add something like this to a Bluetooth headset. </p>
<p>Very nice write up, it is an enjoyable read and a really neat concept. However, I'm curious if this could be added to other devices... Is charging effected by the shape of the coil? Does the coil have to be in a perfect circle? what about position on the charging pad, does that have to be exact?</p>
Thanks! glad you liked it!<br><br>The coil does not have to be perfectly round, but that might affect its efficiency.<br>In fact, in many other applications that use this technology (i.e. RFID, NFC etc.) the coil is rectangular. i guess you can shape it as you wish as long as it's looped around.<br>You might want to do some experiments and see how this affects the energy transfer.<br><br>regarding the position, it works within a small tolerance of movement. this is why these chargers have magnets to align the phone.<br>I saw some commercial chargers that use 3 coils instead of one to allow for more flexibility in positioning the phone on the charger. maybe a bigger coil would help too, I'm not sure.
<p>is this just a transformer were you pull the coils apart do disconnect? if so why? wouldn't just plugging it in be easier? more cell phone stuff i don't get, still glad i use land lines, no batteries.</p>
<p>Instead of actually touch the cable and insert it into phone, with this mod you can just place phone on the recharge base. It's very nice, but simple dock do the same thing.</p>
<p>i haven't used a cell phone in like 7 years, but the last time i did they only needed 1 cable with a proprietary port for that cell. do they many cables now or somthing?</p>
<p>Lol, no, nothing changes. Except this new technology.</p>
Is this like Wi-Tricity, or do you still have to have to place it on the charging pad, i.e. Cordless?
<p>it's the same technology as any other standard wireless charging on the market today. you do need the pad.</p>
Oh ok cool, try for the clarification.
<p>I run a Mini S3, threw in a Chinese system off Fleabay. In my car, I normally use satnav &amp; bluetooth music to my radio. The wireless charging couldn't keep up with the drain, &amp; the phone ran very hot, so I ditched it in favour of the magnetically held micro USB plugs &amp; sockets. Those work well, up to an amp or more charging. Thanks for putting your 'ibble up, it works quite conveniently for just charging.</p>
<p>wireless charging is still a little slow at ~1A, the chinese ones might even be slower.<br>I also put a chinese coil in my car, but I have a built-in satnav so that kind of offloads the phone so it doesn't draw that much power</p>
<p>Hello, first of all thank you for sharing this cool project. second of all do you think this will work with a flip phone? I have a T-Mobile Samsung flip phone that has the same charging USB connection as most android smart phones.</p>
<p>I don't see a reason for it not to work.<br>good luck!</p>
Universal MicroUSB Qi Wireless Charger Adapter is this is good
<p>Very nice, Great job!</p>
<p>I might just make a case with the coil in it, then have a micro-usb plug in the bottom of the case that connects to the phone. I wouldn't have to open the phone, and if i wanted to charge wired, i could just take the case off.</p>
<p>Hey, Thanks for this great Guide .</p><p>But I Have A Question, Can I use QI Chargers ? </p><p>I mean do all the Steps till Step 6 </p><p>And instead of Getting Palm's Charging Coil i Use QI Receiver and Connect it To Copper Foil ( The 5V from USB port ) http://img02.taobaocdn.com/imgextra/i2/134922319/T2SjAWXfFXXXXXXXXX_!!134922319.jpg</p><p>My Phone Is Samsung Galaxy Grand Duos GT-I9082</p>
You can use whatever coil you want as long as it matches the charger and rated 5v. There's no cross compatibility. If you use a Qi coil you need a Qi charger. You can pick those up pretty cheap on eBay.<br><br>Good Luck!
<p>Would this be possible to do with an iphone 5s? I'm thinking of buying one of those cheap extended battery cases and popping it open, taking the battery out, and right there you already have the connections to the phone within the case and you could wire the coil right to the wires that would normally run from the battery to the phone to charge. </p>
I think that it's possible, I've seen someone do something similar to an iPhone 4s, so I don't see a reason for it not to work.<br>It seems pretty straightforward and you don't even have to disassemble the device. Nice idea.<br><br>I'd appreciate it if you report back after your installation. Good luck
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<p>Wow, thanks for the warm words. I hope you enjoyed reading it as much as I did writing it.</p><p>I'll have more stuff to upload soon and if you want, you can check out my new blog for some more awesome projects : HarariProjects.com</p>
<p>Very cool mod. Just wondering what happens if you charge the device with the USB port and the QI charger at the same time? Nothing much or something bad?</p>
Most likely something bad.<br>the voltages from the USB charger and the QI charger aren't exactly the same. Generally, hooking up power supplies in parallel isn't safe, if they have a feedback circuit that adjusts the output voltage, they'll fight each other, trying to lower and raise the voltage according to their different reference values simultaneously until something bad happens.<br>The circuits here aren't that smart, but I wouldn't take that chance with an expensive device.
<p>I have a Velocity Micro Cruz tablet someone gave me with a bad usb port. (not positive of the model) I've tried taking it places to have it repaired but they say they can't get parts for it and although I would have expected a USB port to be a standard item, I was told there are literally thousands of different types. I've tried scavenging ports from a few different devices but haven't found one similar enough to work and they seem nearly impossible to remove intact.<br><br>Anyway, stupid question about soldering points... I don't see anything on the board that looks like somewhere that I could solder into near the usb port. The battery has wires that plug into a socket on the board. Is there a reason I couldn't splice directly into the battery wires themselves?<br><br></p>
<p>yes, there is. the battery charges through a special charging circuit that regulates voltage and cuts power when the battery is full. it also helps calibrate the battery. it's not healthy to charge the battery directly</p>
<p>This is true, although it isn't just unhealthy to charge the battery directly, it can be incredibly dangerous in the case of lithium batteries. Without the charging circuit to control the current and switch it from bulk to trickle charge, the battery will overcharge, heat up, and can violently explode. Soldering directly to the battery terminals for an extended time can have the same effect.</p>
If I use one piece of wire, instead of using adhesive copper foil, will that connect to the 5V or the Ground on the charging coil?
As I mentioned in Step 5, the type of conductive material is not important. you can use wire instead of foil. the wire will connect to the 5V lead. the ground lead is the SIM card guard (or any other grounded piece of metal)
Hi, <br>I have tried to modify a USB cable to short the white and green wires. then I connect it to the touchstone. How to check whether the problem comes from touchstone or chargin coil ? <br>
first, the shortened side should go in the touchstone. <br>second, hook the phone directly to the charger without the touchstone to see that the charger is working. <br>third, check whether the charger is rated at at least 1A. <br>fourth, do you have a voltmeter? check the voltage between the contacts of the coil (when placed correctly on the touchstone). what do you read? a little voltage or none at all?
Hi harari, <br>the shortened side is on touchstone side indeed. <br>I did not put directly the micro usb connector to the phone but I have checked with a voltmeter the voltage between pins 1 &amp; 5 and there is 5.2V as expected. <br>The charger is rated 2A. <br>When I put the coil on the touchstone, i read sth like 100mV only... :-( <br>I don't know if problem comes from coil or touchstone actually.
hmm.. when i had this kind of problem it was the USB cable that wasn't modded correctly.. try to re-mod it or try another cable.
I read your instructions and I had a question of since the Galaxy SII and Note i717 have the same charging port and build structuring but the Note has a 2500 mAh battery instead of a 1650 mAh battery I know that it possibly could increase the charge time. But my question is since you modified the charging structure of the device <br>1. how has it effected the battery life of the device <br>2. has the mod degraded battery performance from a users point of view? <br>3. Are you still using this mod or did you revert back to the original charging circuit. <br> <br>I have a Galaxy Note i717 and the charge port has gone bad and stumbled across this posting and in addition to buying a new port for the device, I am thinking of doing this mod to mine as I am tired of my charging issue currently. Thanks!
I haven't really changed anything in the charging circuitry of the device, just sort of &quot;split&quot; the USB port to allow auxiliary power input. <br>1. It hasn't. and there's no reason for it to effect battery life. the voltage and amperage is the same. <br>2. see 1. the mod is completely transparent to the device. it provides the same electrical characteristics as a normal USB charger <br>3. yes, I'm still using the mod and it's working flawlessly. In fact, i bought another touchstone so i now have one by my bed and one on my desk.
אלוף!! <br>גאווה ישראלית!
חח תודה!
Great work, I have an S2 Skyrocket (AT&amp;T)I'd like to try this on. <br>Does the NFC (near field communication) still work after this mod? <br>If I buy a pixi that powers up with a cracked screen (comes with the charger), that powers up, do I still need to buy a coil, or can I use the coil and magnets from the broken pixi?
Hey, very nice assembling! Very clean. <br>I tried to something like that, but not as clean, as I used a micro-usb connector instead of opening my cellphone case because I have a Motorola Razr HD, with does not allow access to the battery. The problem is, it just doesn't recognize the charger. I shorted pins 2 and 3 on the connector, but nothing. I am using an Qi charger, not cheap chinese, and the voltage I measured is fine. Have you got any ideas what may be wrong? Thanks and congrats again!
i haven't tried using QI so i'm not sure. <br>i don't even know if shortening the data pins is necessary. <br>if you measured correct voltage it should charge, have you tried using it on another device? <br>what's your power source?
Hey. I have redone all my connections and now it is working. I really don't know why, but it does. Now I have to get myself a case and that's it. Thanks for the incentive!
Can u tell which android version or template do you use? It's clean and i love it. And nice project very usefull i will try it in future. Thanks :)
i'm using OmegaROM 4.2.2 AOKP and GO Launcher. <br>they are both highly customizable. <br>i like my phone clean and organized, you should see my app drawer, everything is divided into categorized folders. no app icons. -that's the biggest advantage of the GO Launcher over all the others, the app drawer folders (at least for me). <br>i'll post some screenshots if you want.
i hate these things, they just aren't wireless chargers, do people not understand the concept of wires, In fact this is worse than wires because should you want to use the device whilst charging you will have to use it whilst on the charging base unlike a wired device that you simply pick up. <br> <br>Would you call your mobile wireless communication if you had to hold it to a wired in wall to make a phone call, would you call your computer mouse wireless if it only worked on a specific mat and nothing else
there is a battery still attached, so yes, it is still a &quot;mobile&quot; device. also, if you notice, he didnt remove the charging port. he simply created a double input of power. he can charge it with a cable, or on the dock. but, for the sake of all the others imagine this: <br> <br>You walk into your house, after a hard day at work. all you want is rest, but your phone is about to die from all the phone calls you were doing all day. great, now you're gonna have to spend 10 minutes looking for the charger cord. and when you find one, it's not the right size. there goes 10 more minutes. oh, that's right. you remember that you had a dandy wireless charger installed in your house. the wires encompass your whole house, so there is nothing to worry about. you look at your phone, go to settings, press a button, and voila! your phone is charging, no cords, no hassle. you may now rant about how much you need wires. <br> <br>PS: this idea is a system that I'm working on with a couple friends, maybe ill make an instructable about it. <br>PSS: thank you for the 'Ible! this helps so much! :D

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