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Implementation of a self-triggered control strategy over IEEE 802.15.4
KTH, School of Electrical Engineering (EES), Automatic Control.
2011 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A self-triggered control strategy implementation on a IEEE 802.15.4 based network can prove to be quite difficult. In this master thesis project a study of the IEEE 802.15.4 protocol is conducted to understand what constraints it poses to anĀ  iplementation of a self-triggered controller and the possibility to use it as a feedback link in a control process. A self-triggered control strategy recently introduced by Tiberi et al. is implemented on a wireless sensor network. An experimental test to prove that it is possible to use a self-trigger control is presented. A PI-controller is designed and used on a system where the temperature is measured with a wireless sensor located on a Mote(iv) Tmote Sky. The feedback link in the control process is over a IEEE 802.15.4 network. It is shown that a self-triggered control strategy delivers an equal control result compared to a periodic control strategy while reducing the energy consumption of the network. The results from the conducted experiments show that the hardware in use is not yet ready for the self-triggered control strategy. Even though the same control performance as a periodic controller was achieved, the hardware has some flaws. Problems with beacon adaptivity as well as computation constraints were discovered. It is concluded that for a system with low demands on precision and with a slow dynamic the self-triggered control performs well on Mote(iv) Tmote Sky units. However, a fast system with a high demand on precision is not ready for the self-triggered control implementation while using Tmote Sky platforms.

Place, publisher, year, edition, pages
2011. , 52 p.
EES Examensarbete / Master Thesis, XR-EE-RT 2011:004
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-57709OAI: diva2:472496
Educational program
Master of Science in Engineering - Electrical Engineering
Available from: 2012-01-19 Created: 2012-01-04 Last updated: 2012-03-16Bibliographically approved

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