Under the Bridge

Project HiJack

Here’s an interesting approach to iPhone accessory development, Project HiJack:

HiJack is a hardware/software platform for creating cubic-inch sensor peripherals for the mobile phone. HiJack devices harvest power and use bandwidth from the mobile phone’s headset interface. The HiJack platform enables a new class of small and cheap phone-centric sensor peripherals that support plug-and-play operation.

The HiJack energy harvester can supply 7.4 mW to a load with 47% power conversion efficiency when driven by a 22 kHz tone from the output from a single audio channel on the iPhone 3GS headset port, all using electronic components that cost just $2.34 in 10K volumes…

Sound interesting? Code and schematics available on Google Code, but hey if you have a really good idea … they’re giving boards away free!

If you are interested in getting a HiJack board for your own project, then please send us a short (1 page) proposal of your project idea. The project requirements:

  • Phone and HiJack code must be made available under an Open Source license (BSD-style prefered).
  • We are allowed to link to your project from this website and/or include a picture of your project in the photo gallery.

We currently have 20 HiJacks available to give away. Depending on your project, we can also provide you with a programmer and a breakout board.

Please email your project proposal to [email protected] in PDF format, and don’t forget to put your physical address and email on the top of your summary page.

Here’s your free idea for someone with more time than we’ve got: put a barometric pressure sensor on there so that the iPhone can be a decent altimeter to write a variometer around, or to do some weather forecasting off your phone, or whatever. Surely there can’t be more than 19 other ideas out there better than that!

h/t: Slashdot!

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