Generic Sensor Platform for Networked Sensors Haywood Ho
August 19, 2002Generic Sensor Platform Introduction Goals for summer Longer-term goals Developing generic sensor platform jointly with civil engineering students to write applications
August 19, 2002Generic Sensor Platform Introduction Smart Dust TinyOS Generic Sensor
August 19, 2002Generic Sensor Platform ‘Smart Dust’ MICA ATMEL ATMEGA103 4MHz processor A/D converter Network reprogramming Battery Radio (916 MHz) EPROM, Program Memory, Data Memory
August 19, 2002Generic Sensor Platform
August 19, 2002Generic Sensor Platform Overview of TinyOS Tiny, Microthreaded, Operating System Designed specifically to meet constraints of sensor networks –Robust operation –Low computational power –Low power –Little memory
August 19, 2002Generic Sensor Platform Tiny OS – The Software Component based model Abstracts hardware specifics from application programmer Capable of maintaining high levels of concurrency Services Provided Include: –RF messaging protocols. –Periodic Timer Events. –Asynchronous access to UART data transfers. –Mechanism for Static, Persistent Storage. Complete applications fit in 4KB of ROM and 256B RAM
August 19, 2002Generic Sensor Platform Currently, three types of messages A “ network discovery ” packet Data packets Generic Sensor command packets
August 19, 2002Generic Sensor Platform Generic Sensor: Overview Matlab front-end to allow application developers to control motes (mostly developed by Kamin Whitehouse, graduate student in TinyOS group) Integrates many pre-existing applications to allow motes to be programmed with Matlab instead of TinyOS code (abstraction) No need for network reprogramming Library of data analysis tools in Matlab
August 19, 2002Generic Sensor Platform Architecture OSCOPELEDS COMMAND GENERIC_COMM SLEEPLOGGERLEDSOSCOPE COMMANDAM_ROUTE BCAST GENERIC_COMM
August 19, 2002Generic Sensor Platform Network Discovery: Radio Cells
August 19, 2002Generic Sensor Platform Network Discovery
August 19, 2002Generic Sensor Platform Network Discovery Simple routing algorithm to form routing tree No cycles Too many rebroadcasts Unstable tree Can pick “ bad ” links
August 19, 2002Generic Sensor Platform OSCOPE Data Packets Routed back to the base station using route from network discovery Data can then be captured and visualized in real-time in the Matlab environment
August 19, 2002Generic Sensor Platform Demonstration
August 19, 2002Generic Sensor Platform Conclusions Generic Sensor platform allows faster deployment of sensor networks Allows application programmers to abstract away from lower-level details of TinyOS
August 19, 2002Generic Sensor Platform Further Work Log and Sleep Simultaneous sensing from different data channels Time synchronization issues between motes Robustness Alternative ad-hoc routing alogirthms