Database Info

Desire DC - microUSB - internal resistance

Hi, I'm planning to build my own docking station and need some informations about the HTC Desire micro USB connection and the internal resistance of it!
The USB charger by HTC in Europe has 5V @ 1A max and I have original standard battery.
I've only one microUSB cable now (none to cut) and the connector is to little for my multimeter
Or is there a technical information data sheet for the Desire by HTC?! That would be awesome!!!
Thanks in advance for every hint!

I would definitely go for the official agreed specifications, as microusb is an EU standard agreed among manufactures. It would suggest that the pinout is also standardized and available. Google it.
Sent from my HTC Desire using XDA App

_stefans_ said:
I would definitely go for the official agreed specifications, as microusb is an EU standard agreed among manufactures. It would suggest that the pinout is also standardized and available. Google it.
Sent from my HTC Desire using XDA App
Click to expand...
Click to collapse
Hi Stefan,
Thanks for your quick answer, I checked the USB specifications at www.usb.org already and also the pinout. But I don't want to damage the battery. It seems that there are a lot of different chargers for all the microUSB smartphones.
I will build my own charger, so I cannot buy a standard charger for microUSB - That's because there will be some extra features and It's also a project to learn something for university
An E-Mail to HTC is out - hope they give me some technician sugar
If not, I'll buy a cheap micro USB cable, cut it and let my multimeter do the work...

brianius said:
Hi Stefan,
Thanks for your quick answer, I checked the USB specifications at www.usb.org already and also the pinout. But I don't want to damage the battery. It seems that there are a lot of different chargers for all the microUSB smartphones.
I will build my own charger, so I cannot buy a standard charger for microUSB - That's because there will be some extra features and It's also a project to learn something for university
An E-Mail to HTC is out - hope they give me some technician sugar
If not, I'll buy a cheap micro USB cable, cut it and let my multimeter do the work...
Click to expand...
Click to collapse
if it helps at all i also use a micro usb cable from a Nokia without any issues so i would assume the pinout is the same and standard.

coriron said:
if it helps at all i also use a micro usb cable from a Nokia without any issues so i would assume the pinout is the same and standard.
Click to expand...
Click to collapse
Thanks coriron! That's good to know
If somebody needs service manuals: http://www.mikechannon.net/page1.html (nearly all HTC devices, but Desire and Nexus One)
If anybody has the servie manual for Desire/Bravo or even N1 pls post it here.
The main problem here is, that i don't know the internal resistance while loading the battery. Maybe i can only check the battery with my multimeter, but I think the battery is not the only thing connected to the microUSB while loading...so there is a risk to damage something...and I don't want to buy a new Desire
edit: and of course I want the maximum loading power - and there are chargers between 4-12,5V/0,2-1A - (I've seen so far)
edit2: Okay, found some infos about the chargers - when plugged into PC there is communication through the 2 data channels (D- and D+) - When loading on charger it can happen that there is no charging (because of missing information through data channels) - so one has to connect D+ and D- with Gnd - like in most third party usb chargers! Then it should work. Maybe that helps someone later...
edit3: If someone is interested - one possibility to build a charger (european symbols!):
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

brianius said:
edit2: Okay, found some infos about the chargers - when plugged into PC there is communication through the 2 data channels (D- and D+) - When loading on charger it can happen that there is no charging (because of missing information through data channels) - so one has to connect D+ and D- with Gnd - like in most third party usb chargers! Then it should work. Maybe that helps someone later...
Click to expand...
Click to collapse
Already had this problem a few couple of weeks ago with the car charger i got for the desire. All i did was open the charger up and short the 2 data pins (middle pair) together, not to ground, and it works fine and i now get the full current instead of the usb limit.

why don't you plug a normal usb jack into the htc original charger and measure everything you want to know?
it should be cheap (you must have some unused cables around) and you have enough space to use the mutlimeter.

Surface Pro - More USB ports

Hey guys, I just got my Surface Pro yesterday to replace my old HP Pavilion laptop which was really slow and has its fair share of problems. The one gripe I have with the Surface Pro is its lack of ports.
I want to be able to plug in a mouse and at least on USB drive but a singular USB 3.0 port just isn't going to cut it. So my question is, does anyone have an idea or know of anything that will allow me to plug in both a mouse and a usb stick? Any help would be greatly appreciated.
p.s I am aware of the docking station but its price point is a bit ridiculous. I just want a cheap alternative that won't detract from the design too much as there is a case but it's added size is very unreasonable.

The device you are looking for is incredibly common and so common that you can walk into walmart and have a whole selection of them available. USB Hub. Surprised you havent come across one before.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Depending on the number of ports and whether it is mains or bus powered they can be pretty cheap.

SixSixSevenSeven said:
The device you are looking for is incredibly common and so common that you can walk into walmart and have a whole selection of them available. USB Hub. Surprised you havent come across one before.
Depending on the number of ports and whether it is mains or bus powered they can be pretty cheap.
Click to expand...
Click to collapse
Thanks heaps for the reply. I was actually thinking of these but I wasn't sure if they would work correctly. I'm not very familiar with USB 3.0 and what it can and can't do. I just need a USB hub that has a USB 3.0 upstream and at least 2 USB 2.0 downstreams so I can still plug in my mouse and hardrive and all those other things that have a USB 2.0 upstream. I was looking at these in particular and was wondering if they were 4 USB 3.0 ports or if it was a 3.0 male connector and 4 USB 2.0 female connectors.
http://www.ebay.com.au/itm/4-Port-U...Laptop_Accessories&hash=item4ac5d3e8e3&_uhb=1
http://www.ebay.com.au/itm/m-Speed-...Laptop_Accessories&hash=item51b73b7190&_uhb=1
Any help would be greatly appreciated. If you are able to link me to a cheap one then that would be awesome

Both of the devices you linked claim to be USB3.0 downstream, so would indeed convert 1 USB3.0 slot on the surface to 4 USB3.0 slots, in theory anyway.
Of course in reality, you are sharing 1 ports bandwidth among 4, but for a mouse and a memory stick this is not a problem at all. I've run mouse, keyboard, xbox 360 controller and an external hard drive from a USB2.0 hub without issue, you get the massively faster USB3.0

SixSixSevenSeven said:
Both of the devices you linked claim to be USB3.0 downstream, so would indeed convert 1 USB3.0 slot on the surface to 4 USB3.0 slots, in theory anyway.
Of course in reality, you are sharing 1 ports bandwidth among 4, but for a mouse and a memory stick this is not a problem at all. I've run mouse, keyboard, xbox 360 controller and an external hard drive from a USB2.0 hub without issue, you get the massively faster USB3.0
Click to expand...
Click to collapse
Thanks heaps for that. I just realised that I can plug in a USB 2.0 into the 3.0 port. Sorry for sounding like an idiot but it's just my first device with a 3.0 port.
So now I guess my only question would be whether or not having a switch on each port would make a difference vs no switch?

boss. said:
So now I guess my only question would be whether or not having a switch on each port would make a difference vs no switch?
Click to expand...
Click to collapse
not particularly, if it is a hub with switched ports you could save some battery but alot of hubs are autoswitching anyway and the difference isnt significant.

I use a bluetooth mouse with my surface pro. It connects directly to the bluetooth in the Surface, without anything plugged into the usb port. I find this very convenient and it leaves the usb port open for whatever else. I use the Microsoft bluetooth mouse 5000.
Sent from my GT-N5110 using Tapatalk

I have a USB3 hub, a inateck round hub, makes for easy plugging in various items and is powered, so not using battery up. Jim

Thanks heaps for the responses guys.
I was thinking of using one of the powered ones or the ones with switches so extra battery consumption is kept to a minimum. I have a bluetooth gaming mouse that i'm going to use but will end up getting a USB hub just so I can still have a memory stick plugged in if I need it.

I find that *in most cases* the load on the tablet battery is fairly low and doesnt warrant the extra fuss of a powered USB hub versus a bus powered hub. However, if you do decide to go with a self powered one, find that uses a usb style connector instead of a proprietary power connector. Then you can just use a regular usb cable to power the hub off of the surface's usb charging port on the power cord "brick". That eliminates the need to carry two power supplies with you.
Sent from my GT-N5110 using Tapatalk

The main advantage of a powered (vs. host-powered) hub isn't the battery life impact, but rather the limit on how much energy the host port can provide. Things like keyboards take almost nothing. Things like mice take a bit, but not too much. Things like external HDDs take a lot. Things like charging a phone or other device may take all the power the port can provide. Using a powered hub lets you connect several such devices (for example, your phone and your hard disk, in addition to your mouse and keyboard) without worrying that there won't be enough power for them.

Agreed. Its a question of amperage. Anything I connect to my Surface Pro has minimal power draw, such as a card reader or usb drive. If Im going to charge my phone (which draqs 2amps) I just connect it to handy chargung port on the AC adapter. All my other accessories (mouse and gps antenna) are bluetooth so they are not part of the equation. Im not debating anything above, but just offering the OP that you should consider your power needs and then you can decide if you need a powered hub or not.
Sent from my SM-N900V using Tapatalk

Officially you can draw 1.2A from a usb3 socket, reality is that you probably won't from my the surface. Mouse, keyboard and thumbdrive combined should be under 0.1A, 0.2 at the most. Not a massive impact on battery so I wouldn't be concerned.

PSA - Right Angled USB OTG cables wont fit

just thought i would throw it out there that you can forget about using a right angled otg usb cable. i just unboxed my nexus player and was excited to hook up my ethernet adapter. grabbed my right angled otg cable (only 1 i have) and failed miserbly, stupid hdmi cable. thank god for prime.
just thought i'd throw that tidbit out there to maybe save others some time/frustration

thecrunked said:
just thought i would throw it out there that you can forget about using a right angled otg usb cable. i just unboxed my nexus player and was excited to hook up my ethernet adapter. grabbed my right angled otg cable (only 1 i have) and failed miserbly, stupid hdmi cable. thank god for prime.
just thought i'd throw that tidbit out there to maybe save others some time/frustration
Click to expand...
Click to collapse
Which OTG cable did you go for? I was planning on getting one soon.

i ordered this one. looks like it should fit. ill repost when it arrives with the verdict
http://www.amazon.com/gp/product/B00D8YZ2SA/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

thecrunked said:
i ordered this one. looks like it should fit. ill repost when it arrives with the verdict
http://www.amazon.com/gp/product/B00D8YZ2SA/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
Click to expand...
Click to collapse
Thank you for the recommendation, I was meaning to buy one for some time, just slipped my mind a time or two !

was thinking OTG and hub , but what about a together ?
getting my nexus player tomorrow , and realized i only own right angle OTG , considering the below OTG/hub , i know it requires a power adaptor , but i am a junky for ports and power .
any owners see a issue with this ?
http://www.amazon.com/aLLreli®-Adap...ref=sr_1_1?s=pc&ie=UTF8&qid=1416286919&sr=1-1
manufaturer site
http://www.allreli.com/allreli-7-in...laxy-note-3-s4-s3-s2-xoom-archos-android.html

bkdg100 said:
getting my nexus player tomorrow , and realized i only own right angle OTG , considering the below OTG/hub , i know it requires a power adaptor , but i am a junky for ports and power .
any owners see a issue with this ?
Click to expand...
Click to collapse
A good powered hub is near a must for a device like the NP as there are so many uses for peripherals: hard drives, keyboards, mice, USB keys, Flirc IR controller, usb ethernet, etc. I highly suggest getting a decent powered hub with a lot of ports and a good track record. Monoprice sells a pretty good powered 7 port unit that has great reviews (I have four all over my home) and is relatively cheap:
http://www.monoprice.com/Product?c_id=103&cp_id=10307&cs_id=1030702&p_id=5328&seq=1&format=2
The hub you were looking at above is limited to 3 ports and doesn't come with an a/c adapter. I'd look elsewhere, imho.

So far I have had good results with a bus powered hub. Granted, it's not going to work for a bus powered power hungry accessory, such as an external hard drive. But it powers my wireless dongle for my F710 and a USB flash drive just fine.

I've noticed my Logitech K400 had some pretty bad range issues when the receiver was connected directly to an OTG cable, but when I use a powered hub it's working great. So, it may be worth considering, if you notice any problems with an unpowered setup.

Just want to update. This cord works fine

http://www.amazon.com/gp/product/B00B4GGW5Q/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
I have this one and it works great. I broke my rightangled one trying to force it to fit with the hdmi plugged in...glad they are not expensive.

I bought my right angled USB OTG before I got the unit and also had some trouble getting it in there. The problem was that the power cord was in the way. I resolve it by simply plugging the USB OTG in first and then inserting the power cord.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

30 seconds with a razor blade, and I simply cut away the right angled part all together, and hot glued it into a straight otg

CrustyMcLovin said:
I bought my right angled USB OTG before I got the unit and also had some trouble getting it in there. The problem was that the power cord was in the way. I resolve it by simply plugging the USB OTG in first and then inserting the power cord.
Click to expand...
Click to collapse
You are lucky because yours bends towards the power cord and not the HDMI cable like mine did...there was no way of having both installed at the same time.

djwyman said:
You are lucky because yours bends towards the power cord and not the HDMI cable like mine did...there was no way of having both installed at the same time.
Click to expand...
Click to collapse
Ahh yeah... makes sense.
This is the one I purchased.
http://www.amazon.com/gp/product/B00GM0OZ4O/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

MHL For Pioneer AppRadio3

Hey guys.
This thread is about my Galaxy Note Edge but since it is basically the same as your Note 4's and this forum is more popular I thought someone might be able to assist me quicker
Before my Galaxy Note Edge I had the original Galaxy Note (N7000) and connected it via MHL to my Pioneer AppRadio to fully mirror my phone and it worked perfectly.
The Pioneer Android kit looks like this and comes with MHL...
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
So today I tried to connect my Edge to the AppRadio and it does not work :crying:
I have checked the power and when I connect the MHL power cable to my phone my phone charges so that is fine.
I have tried connecting my Sony Bravia TV to my Edge via MHL using a 'fresh HDMI cable' and it doesn't do anything.
Is the Pioneer MHL incompatible with the Edge (is it a 1st generation MHL) and the Edge can only use the current 3.0 generation OR is the Pioneer MHL compatible but mine is broken? Is the Note 4/Edge backwards compatible?
I really appreciate your help.

I have a note 4, and the appRadio 3 also.
You will require to use the Samsung MHL adapter as the phone requires 11 pin connector for the video output.
I tried many 3rd party adapter, but neither of them are stable. So, I just stick to the OEM one.
Just connects this adapter to the HDMI cable and the USB powered cable and you are good to go.
Hope that helps.
Benny

Thanks for your informative reply.
Having conducted some more research I have found the following:
The original Samsung MHL adapter for smartphones. Released in 2011 for the Samsung Galaxy S2, this adapter has a 5 pin layout. External power is required.
Click to expand...
Click to collapse
I believe the Pioneer MHL provided is Generation 1 (5Pin)
Compatibility with 2nd generation phones is possible with 5-11 pin adapter.
Click to expand...
Click to collapse
The Edge needs an 11pin, like you said and the 5pin will not work on its own and so rather than use a rubbish adapter I have ordered the below.

This is the one I use and works great. I had a Samsung one, but the way the micro USB for charging plugs into the same side as the MHL connection to the phone is awkward. Also, the USB on the back of the head unit doesn't put out enough juice to charge the phone while running GPS/streaming and the like. So with this you have a little extra length to plug into a fast charger if you want, and run the MHL cable to a convenient spot since its a LOT thinner than an HDMI cable from the back.
http://www.amazon.com/gp/product/B00MY05GNA/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

johnboy693 said:
This is the one I use and works great. I had a Samsung one, but the way the micro USB for charging plugs into the same side as the MHL connection to the phone is awkward. Also, the USB on the back of the head unit doesn't put out enough juice to charge the phone while running GPS/streaming and the like. So with this you have a little extra length to plug into a fast charger if you want, and run the MHL cable to a convenient spot since its a LOT thinner than an HDMI cable from the back.
http://www.amazon.com/gp/product/B00MY05GNA/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
Click to expand...
Click to collapse
Thanks for the advice. My original Galaxy Note charged to 100% when under full load with the standard power from the AppRadio. However your right in saying that the new Samsung MHL adapter will ruin my set up because during installation the HDMI/USB Power are in the same 'section' of the centre console and I can't stretch the USB power cable without an extension lead.
So I will use the below that I have fitted in the centre console for power.
So although I won't know if my Edge would drain using the AppRadio power (my N7000 did not do this) this is rated @ 3.6A / 18w and it should be fine.
I have just seen on Amazon that you can now get 4.2A / 20W car chargers which is crazy!
My new Samsung MHL device will arrive sometime today (thanks to Amazon Prime). So I will let you know what happens and take a picture of my current set up.
Ps. When you say 'Fast charger'... what in car charger or power output (e.g. 3.6amps) would you consider being equivalent to our home wall plug fast charger?

Is there an OTG cable that works with Samsung?

I have an SM T290 tab A. Is there a specific OTG cable that I can use? Has anyone had any success?

scampo77 said:
I have an SM T290 tab A. Is there a specific OTG cable that I can use? Has anyone had any success?
Click to expand...
Click to collapse
I know it gets to where you're pulling your hair out in frustration, but.... someone on XDA has nudged me in a new direction and helped, always friendly, and ALWAYS FREE. I had the same problem with cables, I thought anyway. I'm enclosing a pic of the OTG adapter that worked for me, and with every cable and thumb drive, etc. It says SAMSUNG, its just hard to read. Hope this helps Scampo.
Pony
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

Ponius said:
I know it gets to where you're pulling your hair out in frustration, but.... someone on XDA has nudged me in a new direction and helped, always friendly, and ALWAYS FREE. I had the same problem with cables, I thought anyway. I'm enclosing a pic of the OTG adapter that worked for me, and with every cable and thumb drive, etc. It says SAMSUNG, its just hard to read. Hope this helps Scampo.
Pony
View attachment 5227033View attachment 5227033
Click to expand...
Click to collapse
can you attach a thumb drive to your tablet and watch a movie on it while charging at the same time?

scampo77 said:
can you attach a thumb drive to your tablet and watch a movie on it while charging at the same time?
Click to expand...
Click to collapse
What I did instead was to connect a small powered USB hub and connected my thumb drive to the hub. That way you reduce the power draw on your tablet and can run a wireless USB mouse with your thumb drive. (And yes, I watched movies that way). Hope it helps.
Pony

Here is the cheapo I've been using bought off eBay for like $1.50

Thank you but I need to charge while the thumb drive is attached and I need to be able to do this 24 hours a day 7 days a week.

Ponius said:
What I did instead was to connect a small powered USB hub and connected my thumb drive to the hub. That way you reduce the power draw on your tablet and can run a wireless USB mouse with your thumb drive. (And yes, I watched movies that way). Hope it helps.
Pony
Click to expand...
Click to collapse
On amazon you can get an adapter which gives you 3 X usb 2.0 (thumb drive) input plus one usb-a micro (usb 2 charger) input. Mine has a switch between OTG and charge, but if I keep charger in during OTG, it supplies power to thumb drives, and the battery supply barely gets touched.

lifeModder19135 said:
On amazon you can get an adapter which gives you 3 X usb 2.0 (thumb drive) input plus one usb-a micro (usb 2 charger) input. Mine has a switch between OTG and charge, but if I keep charger in during OTG, it supplies power to thumb drives, and the battery supply barely gets touched.
Click to expand...
Click to collapse
This is an automotive install and I've tried all of these options and none work. These tablets and fiberglassed into the dash and need to be charging all day. Then a female USB mounted in the dash to transfer data via a thumb drive.

scampo77 said:
This is an automotive install and I've tried all of these options and none work. These tablets and fiberglassed into the dash and need to be charging all day. Then a female USB mounted in the dash to transfer data via a thumb drive.
Click to expand...
Click to collapse
You'd think that anything installed into the dash like that would run on the car battery. I just use mine for development, which means nothing more than saving / loading text files. I am able to leave it on charge and just flip the switch for 30 seconds or so at a time to access the thumb drive. What about the usb to sd card readers? Same result, I suppose?

lifeModder19135 said:
You'd think that anything installed into the dash like that would run on the car battery. I just use mine for development, which means nothing more than saving / loading text files. I am able to leave it on charge and just flip the switch for 30 seconds or so at a time to access the thumb drive. What about the usb to sd card readers? Same result, I suppose?
Click to expand...
Click to collapse
Yes, same result. This was a headache when I started this 10 years ago with the Nexus 7. But someone came out with a specific automotive installation where the tablet would turn on and of with the key and it would charge with a thumb drive attached and it worked beautiful until it fell out of service.

After a year of working on this problem I found a charger made by a company called lava. The charger is about $100 and it does charging while having usb support. The charger is worth more than the tablet but I didn't have a choice.

scampo77 said:
After a year of working on this problem I found a charger made by a company called lava. The charger is about $100 and it does charging while having usb support. The charger is worth more than the tablet but I didn't have a choice.
Click to expand...
Click to collapse
I know it’s been a bit since this post, but curious if the lavalabs adapter you mentioned worked with your sm t290 ? And if so, which adapter model was it? Trying to figure out the same thing, they are pricey but need to figure this out thanks ++