Anyone know what activates the home and car dock mode on the D3? I know on the X it i a magnet, I haven't been able to get a magnet to work.
I cannot find any information on it but my suspicion is a small chip embedded in the dock that tells the phone what it is when powered up. I don't recall trying my phone in the dock without power though so I'll have to test that out.
Without the dock powered, the phone just sits there. Once you power the dock, the phone switches to car mode. This pretty much argues for some sort of circuitry like a chip.
There are no magnets with D3. Indeed a circuit board resides inside the dock which tells the phone it is docked. It also allows the phone to distinct different home docks for example which is a neat feature. But it leaves home made dock out in the dry...
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The Droid 3 does NOT use magnet field recognition to identify when the phone is docked and into which dock it is placed. The secret is in the USB cable. The docking USB cables cannot be used for data access. Based on all that I have read, the data access pins within the micro USB are used to determine and identify which dock the Droid 3 is placed.
Has anyone tried connecting the USB cable directly to the phone? ( if it is possible) and see if it will go into dock mode. If it does, then one should be able to figure the pin out.
Just went down and pulled the cable from the dock and plugged it into the phone. Nothing happened. No charging, no nothing--nothing except the screen turned off after a few seconds. I then plugged the phone into the dock without the cable expecting what I had seen the last time--nothing--but instead, it went into car mode.
So I have to retract what I said earlier, but caution that someone should confirm these results. It isn't the cable, and it seems to be something passive--at least I don't think the d3 USB port provides power to external devices. That still does not rule out the earlier conclusions that some internal circuitry does the trick. It seems to rule out a small microchip which would need energy to activate it.
The most likely solution seems to me to be that the dock rewires its USB data lines in some fashion. The problem as I see it is that the Droid, not being a host, would rely on some mechanism such as the existence of power at the port to make it leap into some action. Perhaps I'm guessing too much here.
With respect to REMilk and leobg, I already knew from experience that it wasn't the magnets, but haven't found any technical details to prove my assumptions. I for one always like to see some measure of proof so If either of you have at least read or know of a source for information on this, well, I'm curious.
Last edited by Fr33dom; 10-05-2011 at 08:59 PM.
Nice work, we are getting closer. If you look between the USB and the HDMI port you can see some sort of sensor, I am thinking this is what sets it off. Perhaps it is some kind of optical sensor. Maybe placing a piece of black tape over this sensor and docking it may reveal something. I am sorry I do not have a dock to test but I am very interested in solving this.
I have taken the car dock apart and after u plug the micro usb into the car dock it goes through a small circuit board I assume this tells the phone it is in a dock.
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