Wireless Sensor Network

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Wireless Sensor Network
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• A wireless sensor network (WSN) is a wireless
  network consisting of spatially distributed
  autonomous devices using sensors to cooperatively
  monitor physical or environmental conditions,
  such as temperature, sound, vibration, pressure,
  motion or pollutants, at different locations

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• In addition to one or more sensors, each node in
  a sensor network is typically equipped with a
  radio transceiver or other wireless
  communications device, a small microcontroller,
  and an energy source, usually a battery
• The size of a single sensor node can vary from
  shoebox-sized nodes down to devices the size of
  grain of dust
• The cost of sensor nodes is similarly variable,
  ranging from hundreds of dollars to a few cents,
  depending on the size of the sensor network and
  the complexity required of individual sensor
  nodes

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smart bandaids
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Function

• a smart band-aid or wireless temperature system
  which is placed on the patients temple to
  continuously monitor the patients body
  temperature and send the information wirelessly
  in real time to the nursing station

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• a sensor that continuously measures patient heart
  rate and blood oxygenation sending the data
  wirelessly to the nursing station.

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• remote sensors that promote healing as well as
  read and transfer information on blood
  characteristics to computers, which analyze the
  information in real time

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• smart bed sensors that trigger an alarm at a
  nursing station when a patient moves outside of a
  programmed space to alert the health care team
  when a patient may be in danger of falling

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• Consists of
• an A/D converter
• microcontroller
• ultra low power wireless transceiver
• integral antenna system
• power scavenging circuitry
• thin battery technology

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• The band aid consists of the following layers
• Embedded sensor layers
• A flexible insulating printed circuit layer that
  contains the electronics
• A battery layer using flexible thin batteries (
  rechargeable or primary)
• An antenna layer where antennas connected to the
  wireless transmitters will transmit the data to
  the receiving base station in the patient room
• Final covering on the outer part of the band aid
  system, which may include an energy scavenging
  layer which could consist of flexible solar cells
  

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How it work