Re: N900 Wireless Charging
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Re: N900 Wireless Charging
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If it is putting strain on the charging circuitry inside the device it yet to be proven. It seems the battery charges without the device knowing about it. I would assume shorting the Data pins would trick the device into thinking it's charging. |
Re: N900 Wireless Charging
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If you have a Li-ion charge board to add to your phone that charge logic will handle the required 4.1v charging voltage and terminating charge for a full battery on your 3.7v BL-5J battery, it takes a reboot in my experience to get the N900 to report correct charge state once you are finished charging.using an auxiliary charge manager circuit. |
Re: N900 Wireless Charging
I'd say Qi is far more prevalent today that Touchstone. You can find Qi based items all over the place. In fact, there are apparently 3 separate charging systems out in the wild, though until to day I'd only heard of one. Guess which one is winning... Short of Apple grabbing one of the lesser specs (or inventing their own) Qi seems to have the foothold.
Most devices have Qi built in, or (if smart) have connectors under the back cover, and a slim insert or cheap back-plate with the receiver. That would allow them to simple replace that insert or back with another standard receiver if the tables get turned somehow. Right now though, that market looks to be 100% Qi based. (Samsumg, LG, Qualcomm and Nokia are all behind it... so there's a reason it's winning.) The "best" way to do this with the N900 as is today would probably be a pass-through system. The power on the receiver would switch the external USB pins off (via relay or transistor) and connect on in a way that make it look like a charger of proper amperage. That allows the device to continue to know about charging in the way it's used to, eliminates port wear, and doesn't require a software re-write. Doing that in form factor for the N900 would be tough. But if the Neo900 were to have that built-in with exposed pins for power-in from such a plate? May be a last minute request to throw in there? |
Re: N900 Wireless Charging
Hola comrades, I've been requested to post whats below. I hope it helps:
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Sorry mods. Couldn't help myself.
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Honestly, yes, opto's are almost always overkill, but they're a risk reduction tool. Which would you rather do if a static charge hits your device just right? Replace a 50¢ part designed to take the hit, or lose your N900? It's your device, and your decision to make based on your opinion. You know what they say: Opinions are like Estels. Every forum has one, and they all are usually banned. :D |
Re: N900 Wireless Charging
FWIW I have also ordered a Qi universal charger just to see, It looks to protect the USB port from dust as well as being easy to remove for host mode or mass storage. I will post in a thread, maybe not here though, my results when it arrives.
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Re: N900 Wireless Charging
I posted the steps to get the Qi universal receiver to work with the N900 and charge properly: http://talk.maemo.org/showthread.php...01#post1431701
No mods to phone required beyond a bit of electrical tape, some soldering required as the Qi charge receiver linked at the top of the thread does not have shorted data pins required by the N900 battery charging circuit. |
Re: N900 Wireless Charging
As I am looking for Qi chargers atm I ran into this http://katalog.we-online.de/en/pbs/W...5#vs_t1:2_ct:1
can be ordered at rs-online.com (be aware that the older rather thick coils are also available but might not fit a phone I hit the search with the first digits of the WE productcode) |
Re: N900 Wireless Charging
My final install was to stick the charge receiver onto the back of my Mugen battery cover, with a double Scud battery there is just not enough room.
I would love to find some sort of elastic super sticky membrane to stick this to the outside of my cover as it looks rather junky with electrical tape. I suppose it is pretty cyberpunk-now though, badass pocket computer phone, shabby post-apocalyptic exterior. Qi is pretty cool, I really like it and how my port is now well protected at all time unless I am doing USB host mode. |
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