Sensor specification

1
Sensor specification

• Sensor Network Group

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Sensor Specification

• Constraints of tiny sensors
• Power For survival and sensing.
• Computation Application and data aggregation
  strategies drive the computational requirements
• Sensor Different types of sensors like
  temperature, pressure, humidity, light, sound,
  acceleration, magnetic field etc.
• Communication Range and noise in media are the
  major factor.

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Sensor Specification

• Our choice of sensor is SMART Dust. But, SMART
  Dust is not yet available in the market and not
  yet in a position to use for our research about
  Sensor Network.
• In this presentation, we will discuss about the
  alternatives available with the requirements
  mentioned in the last slide. Mostly it is the
  research done for developing Commercial
  of-the-shelf (COTS) Dust, which can be described
  as a test bed for SMART Dust for immediate
  unavailability of SMART Dust in market.

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Sensor Specification

• Power
• Lithium Battery
• Conforms to RF chip requirement of 3 v of
  portable power source (i.e., high energy density)
• Doesnt have high current capacity.
• Nickel-metal hybrid batteries
• Output 260 times more than lithium.
• Voltage regulator require additional power to
  run, added noise to the system add extra
  component

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Sensor Specification

• Computation
• Important features of microprocessor to be
  choosen
• Power
• Memory size
• Fast re-programmability
• A/D channel
• A 3 v operating supply

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Sensor Specification
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Sensor Specification

• Strong thumb is the processor of choice.
• Strong Arm is a little variation to Strong Thumb,
  but with all the properties compared, Strong
  Thumb is considered as a better fit as a
  processor for our Sensor Network application.

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Sensor Specification

• Sensors
• Two major groups
• Weather monitor
• Motion detector
• Most of them have voltage range of 2.7v-5.5v
• Current consumption 600 micro-Amp other than
  light sensor humidity sensors (200)
• Temperature dependence is negligible for most of
  them.

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Sensor Specification

• Communication
• Types are
• Acoustic
• RF
• Optical
• Our choice of communication is RF. Reasons are
  well described in earlier presentations.

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Sensor Specification

• Available RF communications
• Bluetooth
• RF monolithics

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Sensor Specification

• Thank You