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dr_frost_dk is offline dr_frost_dk
2011-05-03 , 21:38
Posts: 1,503 | Thanked: 2,688 times | Joined on Oct 2010 @ Denmark
#11
Nice to see more modders in here, good work.
If it had not been for my pretty powerful external/internal charger i would have made wireless charging myself.

But like the fact that you use a stock product and mod it with the N900, just like me, buy one thing, use it for something probably not intended
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N900 @ 850MHz (LV) & 3044mAh Battery
Battery Tests and Battery Mod / Homemade 3000mAh XL Battery - (DONATE)
Custom Brightness & No Light Sensor
N900 DIY Micro Amplifier, turn your N900 into a home stereo
Fix you USB before and after it breaks
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mrsellout is offline mrsellout
2011-05-03 , 21:56
Posts: 889 | Thanked: 2,087 times | Joined on Sep 2010 @ Manchester
#12
Originally Posted by ~phoenix~ View Post
where can i get theese powermat things??
http://www.powermateu.com/pm_uk/

They're also on Amazon and ebay.
 
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dr_frost_dk is offline dr_frost_dk
2011-05-03 , 23:22
Posts: 1,503 | Thanked: 2,688 times | Joined on Oct 2010 @ Denmark
#13
Another thing, if you make a dual mod, with other battery's then the scuds (because of the thickness), you should be able to integrate the powermat receiver module inside the cover, like if you use japod's or polarcell.
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N900 @ 850MHz (LV) & 3044mAh Battery
Battery Tests and Battery Mod / Homemade 3000mAh XL Battery - (DONATE)
Custom Brightness & No Light Sensor
N900 DIY Micro Amplifier, turn your N900 into a home stereo
Fix you USB before and after it breaks
Feel free to contact me through PM, Skype or G.Talk
 
yorkey is offline yorkey
2011-05-03 , 23:46
Posts: 75 | Thanked: 43 times | Joined on Aug 2007 @ UK
#14
Been considering something like this since I saw a mod for another phone. On Hackaday.
Originally Posted by Wonko View Post
Alright... [B]I took the Powermat receiver of an Iphone 3G Powermat set. You can pretty easily break it off the casing without damaging it.
So, this is from an iPhone powermat. Dont those things need their data lines at certain voltages to charge properly?
If thats the true for the powermat charger, there must be something on the receiver or maybe the back that does the shorting. Any chance of reusing it?
 
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jd4200 is offline jd4200
2011-05-03 , 23:48
Posts: 451 | Thanked: 424 times | Joined on Apr 2010 @ England
#15
Would like to try this, but I'm going though airport security soon and I'm sure all them wires popping out might turn a few heads.
 

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Wonko is offline Wonko
2011-05-04 , 05:25
Posts: 456 | Thanked: 1,580 times | Joined on Dec 2009
#16
Originally Posted by yorkey View Post
So, this is from an iPhone powermat. Dont those things need their data lines at certain voltages to charge properly?
If thats the true for the powermat charger, there must be something on the receiver or maybe the back that does the shorting. Any chance of reusing it?
Well, dunno about the iphone.
But there is the flat ribbon connector on the powermat receiver which connects to quite some pins of the iphone connector. From what I saw some of these are USB data lines indeed. Though, I have no clue what is happening on that lines. Furthermore, I am not that good in SMD soldering. Another chance to get this done could be to mess with the flat ribbon cable directly. Though, these things are pretty sensitive as well. Anyhow, my version is just a pretty crude, "hacked" together proof of concept. Maybe in some time there will be a better solution.

Edit: the iphone 3G Powermat receiver also has loop-through functionality for USB. So it "should" be possible to use this too instead of using a custom diode and a dip switch like I did.

Originally Posted by jd4200
Would like to try this, but I'm going though airport security soon and I'm sure all them wires popping out might turn a few heads.
Heh, yeah, this is also one of my concerns. Well I think I'll have to reactivate an old phone to take with me on the travel. I don't like the idea of some airport security guy pulling apart my N900 and messing with the fragile cabling.

Edit2: or even being pointed at with guns or being thrown at the floor with a knee in my neck...
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Last edited by Wonko; 2011-05-04 at 18:01.
 
Wonko is offline Wonko
2011-05-04 , 18:13
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#17
Originally Posted by woody14619 View Post
WOW! Super! I would love this. I use an Otter Box on the outside, so removing or mangling the original back isn't that big of an issue if that's all the space it needs! Where are you connecting it internally?
It seems like the sender and the receiver need to be put very tightly next to each other in order for the charging to work.
I am not sure if it will work "through" that case.
Most probably you would need to also "mod" your otterbox case.
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woody14619 is offline woody14619
2011-05-04 , 18:49
Posts: 1,455 | Thanked: 3,309 times | Joined on Dec 2009 @ Rochester, NY
#18
Originally Posted by Wonko View Post
It seems like the sender and the receiver need to be put very tightly next to each other in order for the charging to work.
I am not sure if it will work "through" that case.
Most probably you would need to also "mod" your otterbox case.
Thank you for the warning... I think I will order a set anyway and see what happens. I think I will also order a new back, so I have it, just in case I want to use it without the Otterbox in the future.

I've wanted something like this for a long time, but always got hung up on how to connect it into the system without endangering/blocking the USB port. I plan on putting a micro reed relay (or maybe a low power opto-isolator?) in to short the data pins activated by current from pad itself, so it auto-closes the connection when it's powered by the pad. That should take less than 10-20mA for an opto-isolator...

Thanks so much for this awesome mod and the pictures. I love this phone, and the community around it!
 

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Wonko is offline Wonko
2011-05-10 , 20:33
Posts: 456 | Thanked: 1,580 times | Joined on Dec 2009
#19
Originally Posted by woody14619 View Post
I plan on putting a micro reed relay (or maybe a low power opto-isolator?) in to short the data pins activated by current from pad itself, so it auto-closes the connection when it's powered by the pad. That should take less than 10-20mA for an opto-isolator...
Using an opto-isolator seems to work quite well. Thanks for that hint. I made an improved mod that uses such an opto-isolator (Optokoppler in German) to short-circuit +Data and -Data. I attached an image of the actual circuit I am currently using.
The diode BY 133 is used to protect the Powermat receiver from the USB +5V voltage and to prevent the opto-isolator being activated when the N900 is attached to a common USB port/charger.
Furthermore, I am now using the receiver part of a Powermat Nintendo DS Lite charger. This one is slightly thicker and requires more manual work in order to being attached to the N900 battery cover. Though it has the benefit that it is not as complicated as the Iphone 3G version and occupies a smaller area. I'll let you know how this one works out...
Attached Images
 
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Benson is offline Benson
2011-05-10 , 23:40
Posts: 4,930 | Thanked: 2,272 times | Joined on Oct 2007
#20
Originally Posted by Wonko View Post
Alright... of course all warnings etc. from the initial post apply as well

I connect the whole shebang via USB. Though I am not using the USB port but rather the pads beneath the battery (see the first image).

I took the Powermat receiver of an Iphone 3G Powermat set. You can pretty easily break it off the casing without damaging it. Furthermore, it is internally connected via a flat ribbon cable which detaches easily.
On the second picture you can see where I identified GND and +5V (actually you get something around 5.2V from it). I accidentally fried the first GND soldering pad located next to the +5V pad so I used another GND pad which can be seen in the background.
Excellent! Couldn't find complete pinouts when I did my inductive charging mod, so I added a Li-ion charger to directly charge the battery -- now I can connect to the USB pads and BME can stop being a ****** about low-battery warnings.

Check my version out in my sig, and welcome to the very exclusive inductive-charging club!
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