I tried wiring HiJack to a connector from an Apple-manufactired earbud, but had no luck. If you want to try it yourself, here are the details. If anyone sees something I did wrong, please let me know.
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Stripping the white insulation from the earbud cable, I found 6 conductors:
- Green connects to the right speaker, which is the tip of the headphone jack.
- Red connects to the left speaker, which is the connection next to the tip on the headphone jack.
- The fat multicolored wire is actually two conductors. The thin multicolored wires surround a white wire. The white wire connects to the microphone, which is the connection farthest from the tip on the headphone jack.
- The multicolored wires wrapped around the white wire and the two copper colored wires are all ground, which is the connection between left and microphone on the headphone jack.
The wires were too fine to strip. I soldered them to 22 gage wire, which melted the insulation and gave a good connection. All ground wires were soldered to a single connector.
All wires but ground were plugged into the female header on the HiJack device. Ground was plugged into ground on the breadboard circuit. I also tried connection ground directly to the HiJack headphone jack.
Connecting the iPhone using the jack on the HiJack device still worked properly. I checked for shorts and good connections on the earbuds, and everything looked fine, but all I got was a steady signal–turning the pot did not vary the reading.