So far, it has built an EKG interface, soil moisture sensor, an integrated prototype with temperature/humidity sensors, PIR motion sensor, and potentiometer, and a version with a breadboard for prototyping new sensor applications. The team behind Project HiJack envisions users building low-cost sensing and data acquisition systems for student and laboratory use. There is also a low-power FM transmitter for some iPod models that is powered by the headphone jack. Mobile payment processing startup Square uses a small device to read the magnetic stripes on credit cards-it is powered by the headphone jack on an iPhone or other mobile device. ![]() Other peripherals have used a similar technique to draw power and communicate with mobile devices. The components to build a HiJack cost as little as $2.34 in significant quantities. That power runs a TI MSP430 microcontroller as well as any attached electronics, and allows the HiJack to communicate with an iOS application. The system uses a 22kHz audio signal, which is converted into 7.4mW of power at 47 percent efficiency. Project HiJack is a hardware and software platform for enabling communication between a small, low-power peripheral and an iDevice. A group of students and faculty from the University of Michigan's Electrical Engineering and Computer Science Department have developed a small device it calls the " HiJack" to make sensing peripherals easily accessible to those on a tight budget. ![]() However, it is possible to use the headphone jack for two-way data communication with an iPhone and also to power small electronic circuits. Making accessories that tie into an iOS device's Dock connector is an expensive proposition: it requires getting certain components from Apple and applying for a costly "Made for iPhone" (or iPod or iPad) license.
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