Projects: hijack (Hijacking the iPhone earphone jack)

#1

Post by dholowiski » Fri, Jan 14, 2011, 5:32 PM UTC

Projects: hijack (Hijacking the iPhone earphone jack)
eecs.umich.edu

Re: Projects: hijack (Hijacking the iPhone earphone jack)

#2

Post by joe_bleau » Fri, Jan 14, 2011, 6:19 PM UTC

Clever idea, using the audio output as a power supply.

Re: Projects: hijack (Hijacking the iPhone earphone jack)

#3

Post by nickolai » Fri, Jan 14, 2011, 6:20 PM UTC

Cool project!

Currently, I am a bit doubtful concerning whether drawing extra power from an already very battery lifetime-constrained smartphone is a good idea.

On the other hand, the batteries shold improve in the future, so with a bit of luck the idea may just as well come to maturity at the right time!

Re: Projects: hijack (Hijacking the iPhone earphone jack)

#4

Post by chanux » Fri, Jan 14, 2011, 6:29 PM UTC

HiJack in full case reminded of square. https://squareup.com

Re: Projects: hijack (Hijacking the iPhone earphone jack)

#5

Post by ramidarigaz » Fri, Jan 14, 2011, 6:38 PM UTC

nickolai wrote: post #3

Cool project! Currently, I am a bit doubtful concerning whether drawing extra power from an already very battery lifetime-constrained smartphone is a good idea. On the other hand, the batteries shold improve in the future, so with a bit of luck the idea may just as well come to maturity at the right time!

It doesn't drain the battery any more than listening to music does :) Really cool project!

Re: Projects: hijack (Hijacking the iPhone earphone jack)

#6

Post by jrockway » Fri, Jan 14, 2011, 6:45 PM UTC

Now if only you were permitted to write software to take advantage of the cool hardware you build.

Re: Projects: hijack (Hijacking the iPhone earphone jack)

#7

Post by frankus » Fri, Jan 14, 2011, 6:55 PM UTC

Also check out the Southern Stars SkyWire. Apparently it's a true RS-232 I/O cable that plugs into the dock connector. They use it to drive telescopes, but apparently it's not limited to that.

http://www.southernstars.com/products/skywire/index.html

I've gotten as far as opening an input and output stream with it, but I haven't had time to dig up an RS-232 device to try talking back and forth.

Re: Projects: hijack (Hijacking the iPhone earphone jack)

#8

Post by joezydeco » Fri, Jan 14, 2011, 6:59 PM UTC

The O'Reilly "iPhone Hacks" book has schematics and sample code to push RS-232 in and out of the headphone jack. You'll need a self-powered device to decode FSK on the other end, of course.

Re: Projects: hijack (Hijacking the iPhone earphone jack)

#9

Post by pak » Fri, Jan 14, 2011, 7:02 PM UTC

jrockway wrote: post #6

Now if only you were permitted to write software to take advantage of the cool hardware you build.

I have no experience with the App Store approval process but it seems like this might fly. It just uses the audio jack as any custom mic/headset might; conceivably they could use valid API calls to just play or listen for sound and/or drive a constant powering voltage.

Re: Projects: hijack (Hijacking the iPhone earphone jack)

#10

Post by simonk » Fri, Jan 14, 2011, 7:04 PM UTC

jrockway wrote: post #6

Now if only you were permitted to write software to take advantage of the cool hardware you build.

Square has their app on the marketplace. https://squareup.com/