Science Days
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A wireless sensor network
Dr. Miguel Sánchez López Computer Engineering department Universidad Politécnica de Valencia, Spain Leipzig, November 2008
Presentation Outline
Introduction
Developed system
Conclusions
System architecture
Wireless sensor network
Sensors data is gathered by coordinator node Data flow is one way No anytoany communication
Routing on our WSN
4
3
2
2 1
3
2
4
4 3
Beacon messages are sent periodically by coordinator Upon receiving a beacon nodes store the source and retransmit it Thus nodes learn routes to coordinator
Sensor nodes
Nodes transmit temperature, humidity and light level every five seconds Nodes are based on open platform Arduino and Xbee RF modules There is plenty of information and free development tools RF module has its own processor but we use it as a peripheral only
Coordinador node
It is a PC running Linux Coordinator software is written in Java Xbee module is connected using a USB adaptor that emulates a serial port
+
Sleep modes
What to do in between two data transmissions? Being awake is ”expensive”:
Almost 100 mA@5V Arduino design has other advantages but it did not focus on lowpower (serial regulator, USB2serial) Newer versions go to 400uA@3V or better (if power LED is removed)
a
Why yet another WSN?
In our case the answer is simple: Cost
One Arduino board costs around 18 Euros
Same as one Xbee 802.15.4 module
A second reason is for our students to develop their own system We want to make our own mistakes :)
Coordinator administration
A javabased software running on a PC that allows to configure sensor locations on building maps and to view stored (or real time data)
Sensor location
Configure sensor
Realtime data
Webbased data access
Gathered data can be acessed via a web interface Acess from anywhere
Conclusions
Having a working system shows your mistakes quickly Newer version needed if battery operation is required (sleep modes need to be in the uA range not mA!!)
Project done with a shoestring budget
Several improvements in the pipeline
Lowpower, improved routing, data agregation
Thanks
If you have any question ...
Dr. Miguel Sánchez López Computer Engineering department Universidad Politécnica de Valencia, Spain Leipzig, November 2008
Presentation Outline
Introduction
Developed system
Conclusions
System architecture
Wireless sensor network
Sensors data is gathered by coordinator node Data flow is one way No anytoany communication
Routing on our WSN
4
3
2
2 1
3
2
4
4 3
Beacon messages are sent periodically by coordinator Upon receiving a beacon nodes store the source and retransmit it Thus nodes learn routes to coordinator
Sensor nodes
Nodes transmit temperature, humidity and light level every five seconds Nodes are based on open platform Arduino and Xbee RF modules There is plenty of information and free development tools RF module has its own processor but we use it as a peripheral only
Coordinador node
It is a PC running Linux Coordinator software is written in Java Xbee module is connected using a USB adaptor that emulates a serial port
+
Sleep modes
What to do in between two data transmissions? Being awake is ”expensive”:
Almost 100 mA@5V Arduino design has other advantages but it did not focus on lowpower (serial regulator, USB2serial) Newer versions go to 400uA@3V or better (if power LED is removed)
a
Why yet another WSN?
In our case the answer is simple: Cost
One Arduino board costs around 18 Euros
Same as one Xbee 802.15.4 module
A second reason is for our students to develop their own system We want to make our own mistakes :)
Coordinator administration
A javabased software running on a PC that allows to configure sensor locations on building maps and to view stored (or real time data)
Sensor location
Configure sensor
Realtime data
Webbased data access
Gathered data can be acessed via a web interface Acess from anywhere
Conclusions
Having a working system shows your mistakes quickly Newer version needed if battery operation is required (sleep modes need to be in the uA range not mA!!)
Project done with a shoestring budget
Several improvements in the pipeline
Lowpower, improved routing, data agregation
Thanks
If you have any question ...
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