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!
Step 1: What You'll Need
What you'll need is:
A soldering Iron, and some basic soldering skills
Resistors of different values
a helping hand for the soldering
and some glue
shrink tube - optional
3.5mm audio jack - optional
and some wires
You'll only need the 3.5 mm if you want audio out on your dock and this you can either buy or scavenge from almost any old music player or mp3 player and use for this project.
The shrink tube, although not necessary it's recommended so that you don't risk shorting anything.
You'll also need somthing thin and hard to open up the case. (I used a knife)