Making an accessory that connects to the 30-pin connector on an iPad, iPhone or iPod is quite expensive: you need to buy Apple components, adjust a license and pay royalties to be able to carry the burden of responsibility for a seal Made for i. Not everyone can afford it.
To circumvent this limitation, the HiJack project, developed by students from the University of Michigan's Department of Electrical Engineering and Computer Science, studies the possibilities of using the headset connector to exchange information with an iPhone if Square can, for example. what in the others?
The current system uses a 22kHz audio signal to power a TI MSP430 microcontroller and additional components with 7.4mW at 47% efficiency. Depending on the quantity, parts for making a HiJack can cost up to $ 2.34.
So far, the project has yielded the creation of an interface for electrocardiography, a humidity sensor, a thermometer, an infrared motion detector and a potentiometer. Anyone who wants to venture into making their own HiJack can find diagrams and codes here. The most enterprising can still apply to receive one of the 20 prototypes that the students intend to distribute, but with two conditions: make your project code open source and allow everything to be documented on their website.
If I were from Apple, I would keep an eye on it: the intense Force, with these kids.
(via Ars Technica)