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Introduction to Wireless Sensor Networks  20 January 2005
Organizational <ul><li>Class Website </li></ul><ul><li>www.engineering.uiowa.edu/~ece195/2005/ </li></ul><ul><li>Class Tim...
Confusion of Terms Berkeley Mote ZigBee Directed Diffusion Localization Rumor Routing Crossbow MAC Protocols Self-Organizi...
Mote <ul><li>“Tiny piece of anything” </li></ul><ul><li>Low-power (RF) transceiver </li></ul><ul><li>Microcontroller </li>...
Mote <ul><li>Transceiver 400 MHz and up </li></ul><ul><ul><li>Line-of-sight </li></ul></ul><ul><ul><li>Short range </li></...
Operating Systems <ul><li>MSDOS, Windows, Linux, TinyOS </li></ul><ul><li>NOT the interface, but </li></ul><ul><li>The pro...
Sensor Network Gateway Server Internet Sensor field Interface  electronics, radio and microcontroller Soil moisture probe ...
Sensor Network Gateway Server Internet Sensor field Watershed
How Did We Get Here? <ul><li>Advances wireless technology </li></ul><ul><ul><li>MEMS, VLSI </li></ul></ul><ul><ul><li>Band...
Wireless Revolution Boston central telephone station at 40 Pearl Street after the blizzard of 1881
Wireless Revolution TI REGENCY TR-1, 1955, $450 (today) 1 st  Transistor, 1947 Sony TR-610, 1958 Integrated Circuit, 1963 ...
Wireless Revolution Size reduction of cellular telephones
Micro-Electro-Mechanical-Systems (MEMS) ~ 1mm
Micro-Electro-Mechanical-Systems (MEMS) ~ 1mm
Small Sensors ~ 5 mm Sensor uses electrochemical and photonic properties to perform bioanalysis
RF MEMS MEMS Filters: Qs of 98,000 in vacuum, very small Conventional LC Filters - Qs of 100-200, significant board space
Transceiver
Computer Revolution 0.5 oz, 2.25 x 1.25 x 0.25 inch 25 lb, 19.5 x 5.5 x 16 inch ~14 mW ~ 64 W ~ $35 ~ $6K (today) 512 KB F...
Sensor Network Gateway Server Internet +
Next Time: Telemetry vs. Sensor Networks
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Lecture01

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Transcript of "Lecture01"

  1. 1. Introduction to Wireless Sensor Networks 20 January 2005
  2. 2. Organizational <ul><li>Class Website </li></ul><ul><li>www.engineering.uiowa.edu/~ece195/2005/ </li></ul><ul><li>Class Time and Place </li></ul>Please note that the room numbers are different for Mondays and Thursdays. Room 3220 SC 12:30-1:20 Thursday Room 4511 SC   4:30-5:20 Monday
  3. 3. Confusion of Terms Berkeley Mote ZigBee Directed Diffusion Localization Rumor Routing Crossbow MAC Protocols Self-Organizing Networks Tiny-OS Tiny-DB Power Management RSSI ISM Band RFID Smart Dust ?
  4. 4. Mote <ul><li>“Tiny piece of anything” </li></ul><ul><li>Low-power (RF) transceiver </li></ul><ul><li>Microcontroller </li></ul><ul><li>Operating system </li></ul>Crossbow mote with battery
  5. 5. Mote <ul><li>Transceiver 400 MHz and up </li></ul><ul><ul><li>Line-of-sight </li></ul></ul><ul><ul><li>Short range </li></ul></ul><ul><ul><li>Unlicensed operation </li></ul></ul><ul><li>Microcontroller </li></ul><ul><ul><li>ATmega 128 - 16 MHz, 128KB Flash, 4 KB RAM </li></ul></ul><ul><ul><li>Low power, sleep modes </li></ul></ul><ul><li>TinyOS </li></ul><ul><ul><li>Makes programming much, much easier </li></ul></ul>
  6. 6. Operating Systems <ul><li>MSDOS, Windows, Linux, TinyOS </li></ul><ul><li>NOT the interface, but </li></ul><ul><li>The program that manages all other software and the hardware resources </li></ul><ul><li>Provide services to other programs “applications” (encapsulate common tasks) </li></ul><ul><ul><li>For example, a simple task such as writing a few bytes to a disk without an OS is a significant task </li></ul></ul><ul><li>Isolate programmer from hardware </li></ul>
  7. 7. Sensor Network Gateway Server Internet Sensor field Interface electronics, radio and microcontroller Soil moisture probe Mote Antenna Communications barrier
  8. 8. Sensor Network Gateway Server Internet Sensor field Watershed
  9. 9. How Did We Get Here? <ul><li>Advances wireless technology </li></ul><ul><ul><li>MEMS, VLSI </li></ul></ul><ul><ul><li>Bandwidth explosion </li></ul></ul><ul><li>Changes in regulation </li></ul><ul><li>Cultural changes </li></ul><ul><ul><li>Wireless devices are everywhere and people are receptive to new applications </li></ul></ul><ul><ul><li>The concept of networks are ingrained in culture </li></ul></ul><ul><ul><li>Open source </li></ul></ul><ul><li>Computer Science </li></ul><ul><ul><li>Operating system theory, network theory </li></ul></ul><ul><ul><li>Inexpensive compilers </li></ul></ul>
  10. 10. Wireless Revolution Boston central telephone station at 40 Pearl Street after the blizzard of 1881
  11. 11. Wireless Revolution TI REGENCY TR-1, 1955, $450 (today) 1 st Transistor, 1947 Sony TR-610, 1958 Integrated Circuit, 1963 1 st Integrated Circuit, ~1958 Today ~$5
  12. 12. Wireless Revolution Size reduction of cellular telephones
  13. 13. Micro-Electro-Mechanical-Systems (MEMS) ~ 1mm
  14. 14. Micro-Electro-Mechanical-Systems (MEMS) ~ 1mm
  15. 15. Small Sensors ~ 5 mm Sensor uses electrochemical and photonic properties to perform bioanalysis
  16. 16. RF MEMS MEMS Filters: Qs of 98,000 in vacuum, very small Conventional LC Filters - Qs of 100-200, significant board space
  17. 17. Transceiver
  18. 18. Computer Revolution 0.5 oz, 2.25 x 1.25 x 0.25 inch 25 lb, 19.5 x 5.5 x 16 inch ~14 mW ~ 64 W ~ $35 ~ $6K (today) 512 KB Flash 160 KB Floppies 128 KB RAM 16-256 KB RAM 4 MHz 4.77 MHz MICAZ Mote (2005) Original IBM PC (1981)
  19. 19. Sensor Network Gateway Server Internet +
  20. 20. Next Time: Telemetry vs. Sensor Networks
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