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. HiJack has been tested with the iPhone 3G/3GS/4G, iPod Touch, and iPad devices.

Power. 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. We are exploring other approaches for achieving higher conversion efficiencies.

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Data. The HiJack communications layer offers two data transfer schemes. The first allows 300 baud data transfer using Bell 202 FSK signaling. The second offers 8.82 kbaud using a Manchester-encoded, direct-digital communication using hardware accelerators on the HiJack microcontroller and a software-defined, digital radio modulator/demodulator on the phone. The first scheme is described in the ISLPED'10 Design Contest entry (below). The second scheme is described in the DEV'10 paper below.

Feb 26, 2015 Many users of the new Audio Hijack 3 have asked about recording phone calls from their iPhone. If you’re using Mac OS X 10.10 (Yosemite) and iOS 8.1, it’s easy to record these calls with Audio Hijack. Thanks to a new feature called Phone Relay 1, you can use your Mac as the receiver for making and receiving phone calls. That can be handy on. Rogue Amoeba, the single-celled organism behind such stellar Macintosh audio-centric applications as Audio Hijack Pro, Fission, Airfoil, and Radioshift has released its first iPhone/iPod touch.

Ever since Apple removed the 3.5-mm headphone jack from the iPhone in 2016, we've continued to see smartphone manufacturers ax the venerable port. But 2020 threw curveballs. Two—not one, but two. Audio Hijack free download - Audio Hijack Pro, GOM Audio, Acoustica MP3 Audio Mixer, and many more programs.

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Sensing. We envision a range of sensorboards including ozone, carbon monoxide, DVM, blood pressure, blood glucose, and others. But today, we only have four daughterboards: (1) a simple demo board with temperature/humidity sensors, PIR motion sensor, and potentiometer used on the early HiJack prototypes; (2) a 3-lead EKG sensor; (3) a basic soil moisture sensor; (4) a breakout board for fast prototyping on the latest generation of HiJacks.