Analog Digital Sensors

1
Mica Weather BoardMicro-Weather Station
Joseph Polastre - University of
California, Berkeleypolastre_at_cs.berkeley.edu
Design Goals

• Sense events relevant to scientists
• Calibrated sensor with meaningful units
• Miniature size to prevent disturbing existing
  habitats
• Low Power Operation Sensors must last at least
  one field season (approximately 9 months)
• Reliable and repeatable operation
• Low Cost
• Collaboration between UCB, UCLA, and Crossbow

Revision 1.0
Revision 1.5

• Analog Digital Sensors
• Onboard ADC
• Digital Sensor Interface
• Low Power Operation
• Coexists with Other Sensor Boards via Enable
  Protocol

• All Digital, Calibrated Sensors
• Power Conditioning
• 3V sensor support
• 5V sensor support
• Low Power Operation
• Coexists with Other Sensor Boards via improved
  Enable Protocol

Sensor Accuracy Interchange Rate Startup Current
Photo N/A 10 2000 Hz 10 ms 1.235 mA
I2C Temp 1 K 0.2 K 2 Hz 500 ms 0.150 mA
Pressure 1.5 mbar 0.5 10 Hz 500 ms 0.010 mA
Press Temp 0.8 K 0.24 K 10 Hz 500 ms 0.010 mA
Humidity 2 3 500 Hz 500 ms 0.775 mA
Thermopile 3 K 5 2000 Hz 200 ms 0.170 mA
Thermistor 5 K 10 2000 Hz 10 ms 0.126 mA
Sensor Accuracy Interchange Rate Startup Current
Photo 35 5 1 Hz 800ms 0.350 mA
Humidity 2 0.1 3 Hz 11 ms 0.500 mA
Humid Temp 0.01K 0.1K 3 Hz 11 ms 0.500 mA
Pressure 1.5 mbar 0.5 10 Hz 500 ms 0.010 mA
Press Temp 0.8 K 0.24K 10 Hz 500 ms 0.010 mA
Thermopile 2 K 0.1K 2 Hz 500 ms 5.000 mA
Thermistor 1 K 0.1K 2 Hz 500 ms 5.000 mA
Deployments
Enclosures
Great Duck Island

• Acrylic
• RF Transparent
• IR Transparent
• Breathable
• Parylene protectivesealant on electronics

• Breeding area for North Atlantic seabird Leachs
  storm petrel
• Biologists are very interested in knowing
• Occupancy of the burrow during incubation
• Changes in environmental conditions over 7 month
  breeding season
• Differences in the micro-climate of nesting vs.
  non-nesting burrows
• First long term wireless sensor network
  application

Future Work

• Deploy Weather Board r1.5 at
• UC Botanical Gardens
• UC James Mountain Reserve (with UCLA)
• Intel Research Lab Monitoring Application
• Second deployment at Great Duck Island
• Create smaller customized boards for use with the
  Mica Dot wireless sensor platform
• Size of a quarter
• Deploy in small spaces
• eg petrel burrows on Great Duck Island
• Design, build, and evaluate new enclosures
• Integrate into the Generic Sensor Kit
• Easy deployment of wireless sensors with software
  support for scientists

UC Botanical Gardens

• Botanical Garden and Redwood Grove
• Biologists are very interested in knowing
• Microclimate variations along elevation of
  redwood trees
• Microclimate variation along transects of the
  botanical garden
• Local proving ground and testing area for
  wireless sensor networks

For more information
http//www.greatduckisland.nethttp//webs.cs.berk
eley.edu