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Tim Campbell


Publications by Tim Campbell (bibliography)

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Campbell, Tim, Larson, Eric, Cohn, Gabe, Alcaide, Ramses and Patel, Shwetak N. (2010): WATTR: a method for self-powered wireless sensing of water activity in the home. In: Proceedings of the 2010 International Conference on Uniquitous Computing 2010. pp. 169-172. Available online

We present WATTR, a novel self-powered water activity sensor that utilizes residential water pressure impulses as both a powering and sensing source. Consisting of a power harvesting circuit, piezoelectric sensor, ultra-low-power 16-bit microcontroller, 16-bit analog-to-digital converter (ADC), and a 433 MHz wireless transmitter, WATTR is capable of sampling home water pressure at 33 Hz and transmitting over 3 m when any water fixture in the home is opened or closed. WATTR provides an alternative sensing solution to the power intensive Bluetooth-based sensor used in the HydroSense project by Froehlich et al. [2] for single-point whole-home water usage. We demonstrate WATTR as a viable self-powered sensor capable of monitoring and transmitting water usage data without the use of a battery. Unlike other water-based power harvesters, WATTR does not waste water to power itself. We discuss the design, implementation, and experimental verification of the WATTR device.

© All rights reserved Campbell et al. and/or their publisher

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Gupta, Sidhant, Campbell, Tim, Hightower, Jeffrey R. and Patel, Shwetak N. (2010): SqueezeBlock: using virtual springs in mobile devices for eyes-free interaction. In: Proceedings of the 2010 ACM Symposium on User Interface Software and Technology 2010. pp. 101-104. Available online

Haptic feedback provides an additional interaction channel when auditory and visual feedback may not be appropriate. We present a novel haptic feedback system that changes its elasticity to convey information for eyes-free interaction. SqueezeBlock is an electro-mechanical system that can realize a virtual spring having a programmatically controlled spring constant. It also allows for additional haptic modalities by altering the Hooke's Law linear-elastic force-displacement equation, such as non-linear springs, size changes, and spring length (range of motion) variations. This ability to program arbitrarily spring constants also allows for "click" and button-like feedback. We present several potential applications along with results from a study showing how well participants can distinguish between several levels of stiffness, size, and range of motion. We conclude with implications for interaction design.

© All rights reserved Gupta et al. and/or their publisher

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