Instructables

Turn a cheap Samsung Galaxy S3 USB dock to a car/desk trigging media dock

Hi and welcome to my (Jr) instructable
Today I'm gonna show you how to turn a cheap $3 eBay Samsung Galaxy S3 (might work on Galaxy Note and S2 as well) usb dock to an expensive desk or car triggering USB dock with possibility to enable/disable those triggering modes.

What's the difference between docks?
Well there are a couple of different docks out there on the market. As far as I know there's 5 different kinds of docks; a car dock and desk dock, the two we are gonna focus on in this instructable which triggers car/desk mode. And then there's a media dock which is basically a desk or a car dock with a 3mm sound port for audio out that allows you to direct all sounds from your phone to through the sound port instead. And then there the mother off all super dock that enables desk mode, audio out, HDMI out and usb OTG at the same time which basically turns your phone into a computer with usb ports.
Part from these there's the fifth standard cheap usb dock you can order online which basically just acts like a stand for your phone with a usb connection. These docks are cheap and don't trigger anything and that's what we are gonna change.

But what's desk/car mode?
The Idea is that when you connect your phone into a dock it's suppose to recognize it and trigger a certain task. For advanced users this task can be changed to whatever the user wants by using different apps like eg tasker. But the default mode for desk dock is changing the lock screen to the night clock thus turning your phone to a table clock. Whilst in car mode, although not sure (cause I've never tried it since I don't have a car) I believe it triggers drive mode. Which I believe gives you bigger buttons and voice interaction with the phone (and same thing here, can be changed  and used to trigger other stuff if you know how).

for more info use google

Although this is a really easy hack some basic knowledge of electronics is highly recommended since you could potentially destroy your precious S3. This hack was actually made by my girlfriend and does not have 3.5mm audio output but I modded a dock  before this with audio out so i'll be covering that part too.

So... first off: I take NO responsibilities what so ever if you try this and you happen to ruin your phone, injure yourself, destroy something, burn something down, blow something up, get sick, tired, hungry, dumped... so on and so on... you get the point...

If you feel it's fair and still want to do this then let's go!
 
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schultzter7 months ago

I'm shopping for resistors and I notice that apart from the resistance they also specify a wattage. In your instructions you only specify the resistance, so what is the wattage we need as well? Thanks,

woumba (author)  schultzter7 months ago

You don't have to worry about the wattage. Any resistor with the specified values should do. I'm fairly sure the resistors are only used for signal purpose rather than to actually limit voltage so there wont be any high current running through them.

ctuck11 months ago
Looking to make a MHL HDMI OTG Cable or Dock for the S4. I see you're using the 5 Pin USB. Have you looked at the 11 Pin?
woumba (author)  ctuck7 months ago
no I haven't yet I rarely use tv anymore since I do everything on my computer so don't really need the MHL function
but let me know how it goes if you do try to make one
sleeping1 year ago
Thanks for the great ideas. Just got a note II, gonna try this out.