Create iPhone accessories that use the proprietary Apple 30-pin connector is very expensive, because companies have to pay Apple's high licensing costs. The end result is that a simple connection cable to the USB port of the beauty costs € 20. The same, however, does not happen if you use the headphone jack. Here is the simple but brilliant idea of who has set up the project Hijack.
Some engineering students at the University of Michigan has developed a protocol that allows you to open the door to use the jack for accessories. This technology can convert the audio signal from 22 KHz in 7.4 mW of power with 47% efficiency which in turn feeds a TI MSP430 microcontroller.
Technicalities aside, the idea is especially designed for those who want to build accessories cheap, low power consumption. The microcontroller can be built with little more than two dollars, and around the obstacle of the cost of the license, then you can save a lot of money in the creation of new accessories.
For now, have used the Hijack Project to create an electrocardiogram monitor, potentiometers, motion sensors and humidity sensors.
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