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?
No you cannot. The headphone jack is only output.
To connect headphones to a smartphone without a jack, use the combined headphone jack and charging port or Bluetooth headphones. Most smartphones have a combined headphone jack and a charging port. Use an adapter if the headphones don't fit in the smartphone's charging port.
The jack also limits how thin phones can be, although how much thinner phones need to be from a consumer point of view is an open question. Apart from incredible thinness, dumping the headphone jack makes it easier to waterproof a device. It's one major source of ingress no one has to worry about anymore.
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:
Once you have them, follow these instructions:
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