Hijacking power and bandwidth from the mobile phone's audio interface

We endow the digital mobile phone with an analog interface that can parasitically power external peripherals and transfer data to and from them using the existing headset interface. Our design delivers several milliwatts at 3 V to a load and offers a bidirectional communications channel at a data rate of 300 bps. We demonstrate a simple oscilloscope application using this new functionality.

• Type: Journal
• Year: 2010
• Where: SENSYS
• Authors: Ye-Sheng Kuo, Thomas Schmid, Prabal Dutta
• Keywords: Bidirectional Communications Channel, Headset Interface, Sensor Networks, SENSYS 2010, Simple Oscilloscope Application