WATTR: a method for self-powered wireless sensing of water activity in the home

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 16bit 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 singlepoint 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. Author Keywords Power Ha...

• Type: Conference
• Year: 2010
• Where: HUC
• Authors: Tim Campbell, Eric Larson, Gabe Cohn, Ramses Alcaide, Shwetak N. Patel
• Keywords: HUC 2010, Human Computer Interaction, Water Activity Sensor, Water Pressure, Water Usage