SunSPOTs At Sydney University by Tim Dawborn. Agenda What are SunSPOTs? What are we doing with them?...
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Transcript of SunSPOTs At Sydney University by Tim Dawborn. Agenda What are SunSPOTs? What are we doing with them?...
![Page 1: SunSPOTs At Sydney University by Tim Dawborn. Agenda What are SunSPOTs? What are we doing with them? Corona SPOTCopter.](https://reader036.fdocuments.us/reader036/viewer/2022062404/551c36c45503467b488b4607/html5/thumbnails/1.jpg)
SunSPOTsAt Sydney University
by Tim Dawborn
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Agenda
What are SunSPOTs? What are we doing with them?
CoronaSPOTCopter
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What are SunSPOTs?
A SunSPOT is a small electronic device made by Sun Microsystems
They have a variety of sensors attached to it
SunSPOTs are programmed in a Java dialect, with the Java VM run on the hardware itself (“bare metal”)
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What are SunSPOTs? Java “Squawk” VM 180 MHz 32bit ARM920T core 512K RAM 4Mb Flash Memory 2.4 GHz IEEE 802.15.4 radio USB interface 2G/6G 3-axis accelerometer Temperature, light, touch sensors 5 IO pins and 4 output only pins
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What are SunSPOTs?
SunSPOTs communicate wirelessly to one another via the 802.15.4 “Zigbee” protocol
Putting many of these SunSPOTs together forms a Wireless Sensor Network (WSN)
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Wireless Sensor Networks “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, pressure, light, motion or pollutants, at different locations”[1]
Most WSN platforms are programmed in a C dialect called nesC
[1] http://en.wikipedia.org/wiki/Wireless_sensor_network
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What are we doing with them?
Corona: SunSPOT Distributed Query Processing SystemProject started in 2006Being open sourced early in 2009A query processing platform for a
SunSPOT WSN
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Corona Original Architects:
Raymes Khoury Tim Dawborn Edmund Tse Dr. Bernhard Scholz
Core Developers: Raymes Khoury Tim Dawborn
Other Important Contributors: Dr. Uwe Röhm Saeed Attar Khaled Almi'Ani Glen Pink
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Corona What is a distributed query processor?
Make the WSN act like a table in a relational database
Corona allows queries to be formulated in an SQL-style syntax, which are fed to the SunSPOT network to be executed, for which a table of results is retrieved
Example: SELECT temp, light FROM network WHERE temp > 25
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Corona
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Corona
Corona is a resource-aware systemResource awareness is a key aspect of
WSN programmingUsing the wireless to communicate
between nodes is the most costly operation on the SunSPOTs
WSN nodes should be deployed once and last a long time without having to be physically altered
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Corona
Distributed relational database issuesHow can you do relational operations
such as “AVERAGE(light)” in a distributed environment?
How can you do subqueries in a distributed environment where network transmission is very costly?SELECT node, parentWHERE light > (SELECT MAX(light) GROUP BY temp)
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Corona
Resource-aware networking issuesHow should you detect new nodes in the
mesh network when transmission is costly?
Being a “distributed database” system, what should happen if a bridge node in the network drops out in terms of the data in the now isolated component of the network graph?
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What are we doing with them?
SPOTCopter: Remote Control Helicopters INFO1905 Advanced first year project
this semesterAim is to get the user to specify the
height to hover at from a desktop computer, and to make the SunSPOT mounted to the helicopter perform this action
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SPOTCopter
Flying a helicopter is easier said than done – unstable system
SunSPOT platform does not have proper floating point numbers
SunSPOTs have a slow clock speed so solving differential equations of motion in “real time” has issues
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SPOTCopter
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SPOTCopter
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SPOTCopter
A project still in the making By the end of the year there will be a
Youtube video of our SPOTCopter flying
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Conclusion
SunSPOTs are a nice platform for working with WSN technologies partially due to using Java over nesC
WSN is an new and exciting research area
WSN technologies have a lot of real world applications
http://www.it.usyd.edu.au/~wsn