It's not that simple to make pedestal accessories for iOS devices such as iPhone, iPad and iPod. It is necessary to apply to Apple and review it. Then Apple will provide some necessary parts. Of course, the application fee is also expensive. . However, some people have come up with other ways to bypass Apple's review and start to play the idea of ​​the iPhone headset. The iPhone's headsets are capable of two-way data communication, and they use the power of the iPhone to drive small boards to run, which is a smart way.
The people who experimented were the teachers and students from the Department of Electrical Engineering and Computer Science at the University of Michigan. They formed a project team called "HiJack" to conduct the experiment. The experiment uses a 22 kHz audio signal for communication with a power of 7.4 mW and a conversion rate of 47%, so it does not allow large amounts of data such as video and text to be transmitted, but like air pressure sensors, element detectors, electrocardiogram sensors, etc. Small, low-power chips are still perfectly connected to the iPhone. At present, the experiment has been able to connect many electronic sensor chips through Texas Instruments' TI MSP430 microcontroller, which can realize many practical functions. What is more attractive is that the cost of the whole set of equipment is only 2.34 US dollars, compared with the expensive license. It is very cost-effective.
Currently the system only supports iOS, the team also plans to develop API services, so that HiJack can also run on other mobile platforms.
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