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Ad Hoc and Sensor Networks Exercise 4

Ad Hoc and Sensor Networks Exercise 4. Sensor Network programming. TinyOS exercise. Sensor network programming in a nutshell Read a tutorial Solve two (simple) tasks on real hardware Lab-style exercise Teams of two to three students are ideal Two parallel lab working places are available

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Ad Hoc and Sensor Networks Exercise 4

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  1. Ad Hoc and Sensor Networks Exercise 4 Sensor Network programming

  2. TinyOS exercise • Sensor network programming in a nutshell • Read a tutorial • Solve two (simple) tasks on real hardware • Lab-style exercise • Teams of two to three students are ideal • Two parallel lab working places are available • Reservation system on the course website • Expected time needed for all tasks:3-4 hours • Mandatory to get the testat without taking the exam

  3. Tutorial • Carefully read the tutorial on the TinyOS website • http://www.tinyos.net/tinyos-1.x/doc/tutorial/index.html • Ignore instructions about setting up the system, flashing applications, simulation, and data ROM access • The tutorial contains several exercise tasks: Think about them but do not write code • We use an Eclipse plug-in to develop the applications which is not mentioned in the tutorial

  4. Exercise 1 • Exchange of a sensor reading • Two sensor nodes are used for this task • One node periodically samples its light sensor and broadcasts the reading over its radio • The other node listens for radio messages and signals if it is getting brighter or darker • Brighter -> The green LED of the receiver is set • Darker -> The red LED of the receiver is set • No significant change -> The yellow LED is set What exactly do we get from the sensor?

  5. Exercise 2 • Optical Communication using Morse Codes • Sender • Sensor node connected to the pc over a serial connection • Controlled by a (provided) java application • LEDs are toggled on/off to transmit Morse signals • Receiver • Sensor node sampling its light sensor. Detects and decodes Morse signals • Connected to a pc over a serial connection. On the pc the Hyperterminal is used for output on SimpleBlinker · – A on off on off on MorseReceiver Morser.jar Hyperterminal

  6. Exercise 2 • Optical Communication using Morse Codes • Sender • Sensor node connected to the pc over a serial connection • Controlled by a (provided) java application • LEDs are toggled on/off to transmit Morse signals • Receiver • Sensor node sampling its light sensor. Detects and decodes Morse signals • Connected to a pc over a serial connection. On the pc the Hyperterminal is used for output on off on off on on off A SimpleBlinker A on off on off A off MorseReceiver Morser.jar Hyperterminal

  7. Exercise 2 • Optical Communication using Morse Codes • Sender • Sensor node connected to the pc over a serial connection • Controlled by a (provided) java application • LEDs are toggled on/off to transmit Morse signals • Receiver • Sensor node sampling its light sensor. Detects and decodes Morse signals • Connected to a pc over a serial connection. On the pc the Hyperterminal is used for output Ex 2 dumb smart smart dumb SimpleBlinker MorseReceiver Morser.jar Hyperterminal

  8. General Information • Code Skeletons for both applications are provided • Exercise 1 only needs very little additional programming and should be solved by all groups • Exercise 2 is more challenging but is also more fun Hint: Exercise 1 may contain helpful code fragments

  9. Setup • The lab computers are preinstalled with all necessary tools and the exercise skeletons • An Eclipse plug-in for TinyOS development is installed and configured. Check the following website for a quick start on how to use it:http://dcg.ethz.ch/projects/tos_ide/

  10. Compiling • For all Exercise applications two compile commands are defined. • Target tinynodeis used to compile the application. The compiler output is directed to the Eclipse console • tinynode install is used to compile and flash the application to a sensor node • A popup asks for a bsl number. This is the identifier of the serial port the sensor node is attached to. The identifier count starts at 0. Therefore COM1 == 0, COM2 == 1, COM3 == 2

  11. Final Remarks • The lab is in the ETL building. Hardware and keys must be fetched in our office ETZ G64.1 • If you get stuck come back to ETZ G64.1 and ask for help • A FAQ page will be linked from the course website and updated regularly

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