Generic Sensor Platform for Networked Sensors Haywood Ho

Generic Sensor Platform for Networked Sensors Haywood Ho

Introduction • Smart Dust • Tiny. OS • Generic Sensor August 7, 2002 Wireless Sensor Networks

‘Smart Dust’ • MICA • ATMEL ATMEGA 103 4 MHz processor • 512 KB flash memory, 4 KB RAM • A/D converter • Network reprogramming • Battery • Radio (916 MHz) August 7, 2002 Wireless Sensor Networks

August 7, 2002 Wireless Sensor Networks

Overview of Tiny. OS • Tiny, Microthreaded, Operating System • Designed specifically to meet constraints of sensor networks – Robust operation – Low computational power – Low power – Little memory August 7, 2002 Wireless Sensor Networks

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 4 KB of ROM and 256 B RAM August 7, 2002 Wireless Sensor Networks

Generic Sensor Platform • Currently, three types of messages • A “network discovery” packet • Data packets • Generic Sensor command packets August 7, 2002 Wireless Sensor Networks

Generic Sensor: Overview • Matlab front-end to allow application developers to control motes • Integrates many pre-existing applications to allow motes to be programmed with Matlab instead of Tiny. OS code (abstraction) • No need for network reprogramming • Library of data analysis tools in Matlab August 7, 2002 Wireless Sensor Networks

Architecture OSCOPE LEDS RADIO COMMAND GENERIC_COMM August 7, 2002 Wireless Sensor Networks

Network Discovery: Radio Cells August 7, 2002 Wireless Sensor Networks

Network Discovery August 7, 2002 Wireless Sensor Networks

Network Discovery • Simple routing algorithm to form routing tree • No cycles • Over rebroadcasts August 7, 2002 Wireless Sensor Networks

OSCOPE Data Packets • Routed back to the base station using stored route from network discovery • Data can then be captured and visualized in real-time in the Matlab environment August 7, 2002 Wireless Sensor Networks

Demonstration August 7, 2002 Wireless Sensor Networks

Conclusions • Generic Sensor platform allows faster deployment of sensor networks • Allows application programmers to abstract away from lower-level details of Tiny. OS August 7, 2002 Wireless Sensor Networks

Further Work • Log and Sleep • Simultaneous sensing from different data channels • Time synchronization issues between motes • Robustness • Alternative ad-hoc routing alogirthms August 7, 2002 Wireless Sensor Networks