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wraggster
August 22nd, 2011, 18:40
http://hackadaycom.files.wordpress.com/2011/08/android-headphone-controller-e1313596810671.jpg?w=470&h=353
Here’s an Android headphone add-on so clean that most people won’t know you built it yourself. [Will Robertson] was unsatisfied with the stock headphones that came with his HTC phone, but didn’t want to lose the control interface when upgrading. He built this add-on that lets him control the Android music player (http://willrobertson.id.au/projects/htcheadphone/).
He was inspired to do this after reading about the control interface in one of our previous features (http://hackaday.com/2010/11/03/patching-into-android-music-control/). That hack detailed how to add control based on the 4-conductor headphone jack, but didn’t see us through to a clean finished product. [Will] picked up where it left off by designing a sleek surface mount board that hosts a headphone jack and three tactile switches. A patch cable is soldered opposite the jack, making this work as a pass-through device. The icing on the cake is the shrink tubing that masks the fact that this is a diy dongle.
If you want to follow his lead, [Will] posted his EagleCAD design files and footprints for the components he used in the post linked at the top.

http://hackaday.com/2011/08/17/very-clean-android-headphone-controller-project/