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I'd like to make my own doc similar to below. The official one for $90 doesn't come with a power adapter so I assume you just plug the USB charger into it. What pins from USB map to the three pins in the photo?

enter image description here

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2 Answers

up vote 4 down vote accepted

Someone over at AndroidCentral built their own charging dock. According to the post,

... the pin closest to the bottom of the GN is the 5V and the pin closest to the power button in the GND.

It is assumed that the middle pin is for letting the phone know it's connected to the dock and launch the needed activities (enable Bluetooth, launch apps, etc.)

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Google Play Store says the pogo pins are 5V, digital audio and GND. So I guess the middle pin is the digital audio and that the phone finds out it is connected to the dock because there is a 5V tension between 1st and 3rd pin.

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Have you got a link to where in the store it says that? –  GAThrawn Jan 11 '13 at 13:43
    
@GAThrawn - Here, under "tech specs". –  Compro01 Jan 11 '13 at 16:00
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