Glass recently released headphones and a mono ear bud. This implies that it is capable of producing an audio signal from the Micro USB port.
Is it possible to create an adapter for Glass to connect to a standard audio connector, such as a 3.5mm headphone cable?
If you're handy with a soldering iron, it's pretty easy to make an adapter. Solder a 500k ohm resistor between pins 4 and 5 (ID and GND).
You'll need the following parts:
- A microUSB headset adapter with all 5 pins, like this one on Amazon.
- A 500k ohm resistor
- Knowledge about the pinout of the Micro-B usb connector. Wikipedia describes it pretty well.
Once you have them, follow these instructions:
- Open up the headset adapter and take a look around. If you ordered the one linked above, you'll find pins 4 and 5 connected by a solder bridge, but if you have a different one you may find a something else, like a resistor.
- Desolder pin 4 if you need to.
- Solder the 500k ohm resistor between pins 5 (GND) and 4 (ID).
来源：https://stackoverflow.com/questions/19738163/how-can-i-get-audio-output-from-google-glass-to-a-3-5mm-headphone-jack