OTG MODE & CHARGING AT THE SAME TIME - XPERIA S
http://www.youtube.com/watch?v=-v7DjU6nsVM
HOW TO MAKE SIMPLE OTG CABLE [TUTORIAL]
How to make a USB Y cable for host mode on HP TouchPad or Android
http://www.youtube.com/watch?v=p10LgZFIawohttp://www.youtube.com/watch?v=-v7DjU6nsVM
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標題: 改造USB充電器，照樣實現OTG功能。
作者: tjds50 時間: 2009.7.12 11:33
標題: 改造USB充電器，照樣實現OTG功能。
本帖最後由 tjds50 於 2009.7.12 14:56 編輯
看到有魅族電池和的朋友興高采烈地使用艾諾固件提供的OTG功能，心裏十分羡慕。無奈自己沒有那個電池盒，只好自己動手改造了。前提是用資料線連接的那種充電器。
原來有一個道勤的RM-09播放器，原配一個充電器正好用來改造。
先把資料線剪斷，發現裏面有紅 、白、綠、黑四根線。剪短紅線以免MINI USB 口向小機供電。只用白、綠、黑三根線。
打開充電器，分別把黑線連接充電器標準USB母口的電源負極（接地線）：綠線連接挨著地線的那個接點：白線接到第三個接點。這樣焊接好後在充電器相應位置開個出線口後把充電器組合好就完成任務了。
把充電器插到電源上，MINI口接小機，把優盤插到充電器的USB母口上，開機選擇USB外設後按確認鍵。很快機器就找到優盤並出現盤符.至此就可以播放優盤的檔了。
在充電器的USB母口上連接硬碟也成功（曾經為把升級電腦後換下來的硬碟做USB硬碟用買過一套富運達科技的USB2.0 IDE Adapter)
標題: 改造USB充電器，照樣實現OTG功能。
本帖最後由 tjds50 於 2009.7.12 14:56 編輯
看到有魅族電池和的朋友興高采烈地使用艾諾固件提供的OTG功能，心裏十分羡慕。無奈自己沒有那個電池盒，只好自己動手改造了。前提是用資料線連接的那種充電器。
原來有一個道勤的RM-09播放器，原配一個充電器正好用來改造。
先把資料線剪斷，發現裏面有紅 、白、綠、黑四根線。剪短紅線以免MINI USB 口向小機供電。只用白、綠、黑三根線。
打開充電器，分別把黑線連接充電器標準USB母口的電源負極（接地線）：綠線連接挨著地線的那個接點：白線接到第三個接點。這樣焊接好後在充電器相應位置開個出線口後把充電器組合好就完成任務了。
把充電器插到電源上，MINI口接小機，把優盤插到充電器的USB母口上，開機選擇USB外設後按確認鍵。很快機器就找到優盤並出現盤符.至此就可以播放優盤的檔了。
在充電器的USB母口上連接硬碟也成功（曾經為把升級電腦後換下來的硬碟做USB硬碟用買過一套富運達科技的USB2.0 IDE Adapter)
上些圖片：
改造後的充電器（用資料線還可以給原機器充電），引出一個MINIUSB介面。
充電器元件面
充電器焊接MINIUSB介面的位置
連接優盤情況
連接硬碟情況，硬碟內的三個盤符列表
其中一個盤符內的列表
播放硬碟中的視頻檔
不知道這次行不行
補充幾句，優盤、硬碟還都可以中斷點續播，看起來這個固件製作的不錯。固件大小比前幾版本小了一半多，證明垃圾文件都精簡了。
還望艾諾再接再厲，充分挖掘索智晶片的潛能。
如果有軟體支援，那麼CC1600也可以這樣實現OTG功能吧？？？
我的OTG實施方案目前自己比較滿意，不用去商家拿那個專用線了，而且還可以用改造艾諾原配的充電器做外接電源。哈哈，再連接好電視，這個小機器的所有介面都插滿了。
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USB OTG and charging at the same time [UPDATE]
Hi there,
So I been looking for a way to both charge and use USB OTG after a short search in Google I found this:
http://www.youtube.com/embed/p10LgZFIawo
http://www.youtube.com/embed/p10LgZFIawo
basically this guy used a simple USB Y cable which look like this
If you look inside that cable it would probably look like this:
so from that pattern we can see that there is no way that our S3 will charge (frankly saying I don’t really know why his TouchPad was USB and AC Charging signalling [HOW TO] – INFO” href=”http://eng.samaanetwork.com/?p=5027″>charging)
OK so what now? is it possible?
well probably it is possible somehow.
http://forum.xda-developers.com/showthread.php?t=1613536
2nd May 2012, 11:02 AM
The red cross indicates the one wire collision when DEVICE B provides power. If device B doesn`t provide power there won`t be any problems surely.
But as I thought of it, there is no solution for it - parallel voltage will surely damage one device on one side. The power sources providing high-efficient PWM power has very very low input resistance. So if we connect any voltage to its output, very high current will flow throught and surely damage the power source. This can happen very easily, because from phycisict`s point of view the higher voltage source will damage the less voltage source (there is +/- 10% tolerance on USB power, so this could happen everytime).
So now I am thinking about some mosfet auto switching circuit, which could automatically connect or disconnect power from master device... Or maybe will simple add an switch which will disconnect the power from master device everytime and power just a slave.
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4th May 2012, 12:41 AM
It doesn't pay to overthink this.
These devices are usually designed to take a beating.
Just connect all the Vcc's together.
I've been using something similar on my B&N Nook Touch for months.
It's not a solar charger, but a modified $10 USB hub.
I can use USB host mode on my Nook and charge at the same time.
Of course, all the peripherals are powered off the hub power supply too.
A general schematic is attached, pull the diode and insert a jumper.
Since USB was really not designed to charge in host mode,
there are two problems related to getting the device charging circuit to play nicely.
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If you look inside that cable it would probably look like this:
so from that pattern we can see that there is no way that our S3 will charge (frankly saying I don’t really know why his TouchPad was USB and AC Charging signalling [HOW TO] – INFO” href=”http://eng.samaanetwork.com/?p=5027″>charging)
there is a simple explanation why it won’t charge, there is something that called "USB Battery Charging Specification" which is some kind of a standard for charging via USB port therefore for the phone to recognize that a charger is connected the D+ and D- should be shorten together or connected through a 200k resistor (BTW to charge an iphone it should sense a voltage on D+ and D- but it is a different story, what I’m trying to say is that it is true for all phones).
we could just connect the D+ and D- in the Y cable and charge but then the OTG won’t work because it need the D+ and D- to transfer data
OK so what now? is it possible?
well probably it is possible somehow.
========================================================================
Possible USB OTG Power collision in hub ?
http://forum.xda-developers.com/showthread.php?t=1613536
2nd May 2012, 11:02 AM
The red cross indicates the one wire collision when DEVICE B provides power. If device B doesn`t provide power there won`t be any problems surely.
But as I thought of it, there is no solution for it - parallel voltage will surely damage one device on one side. The power sources providing high-efficient PWM power has very very low input resistance. So if we connect any voltage to its output, very high current will flow throught and surely damage the power source. This can happen very easily, because from phycisict`s point of view the higher voltage source will damage the less voltage source (there is +/- 10% tolerance on USB power, so this could happen everytime).
So now I am thinking about some mosfet auto switching circuit, which could automatically connect or disconnect power from master device... Or maybe will simple add an switch which will disconnect the power from master device everytime and power just a slave.
========================================================================
4th May 2012, 12:41 AM
It doesn't pay to overthink this.
These devices are usually designed to take a beating.
Just connect all the Vcc's together.
I've been using something similar on my B&N Nook Touch for months.
It's not a solar charger, but a modified $10 USB hub.
I can use USB host mode on my Nook and charge at the same time.
Of course, all the peripherals are powered off the hub power supply too.
A general schematic is attached, pull the diode and insert a jumper.
Since USB was really not designed to charge in host mode,
there are two problems related to getting the device charging circuit to play nicely.
- When using host mode to directly power a peripheral you must make the device charging circuit go off.
To go into host mode the device must raise the Vcc line to 90% of 5V, i.e. >4.5V.
If the device charging circuit is still enabled it will try to charge itself using itself! - When using host mode with incoming power the device charging circuit must be convinced to charge.
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