Wireless Sensor networks

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  • 1. A STUDY OF OPERATING SYSTEMS FOR WIRELESS SENSOR NETWORKS
  • 2. WIRELESS SENSOR NETWORKS: A wireless sensor network (WSN) is a wireless network consisting of distributed autonomous devices (say motes) which contains sensors to monitor environmental changes and these changes are communicated to a remote computer at regular intervals. MOTES: Mote is a tiny hardware device which consists of Sensors, Microcontroller , Analog to Digital Converter and power supply. CHARACTERISTICS OF MOTES: • Smaller in size • Highly memory constrained devices(<20 KB RAM) • Low power consumption(<30 mA) • Limited processing capacity
  • 3. OPERATING SYSTEM FOR MOTES: Motes are simple hardware devices and they need to communicate with each other. For this we need an Operating System to establish communication with other motes. Operating Systems are used in Motes to achieve the following features • Efficient multi-tasking • Networking • Memory management • Power management • Process scheduling Available operating system for motes is as follows: TINY OS:
  • 4. Tiny OS is a free open and open source operating system for Wireless Sensor Networks. It started as a collaboration between the University of California and Intel Research. Tiny OS is completely written using nesC programming language. FEATURES OF TINY OS : • Component-Based operating system. • Event driven Operating System. • Tasks are non-preemptive and run in First In First Out(FIFO) order. • Codes are linked statically. • Application and Libraries are written using nesC,a programming language .