1. 1 Thomas Watteyne @ EDERC 2010 6. Conclusions and Road Ahead

2. 2 Conclusions A building block approach – Blinking LEDs – Interacting with button – Measuring time – Interacting with the serial port – Sending/receiving packets More? – http://wsn.eecs.berkeley.edu/svn/ezwsn/ http://wsn.eecs.berkeley.edu/svn/ezwsn/ – http://cnx.org/content/col10684/latest/ http://cnx.org/content/col10684/latest/ – http://openwsn.berkeley.edu/ http://openwsn.berkeley.edu/ Contribute! – watteyne@eecs.berkeley.edu watteyne@eecs.berkeley.edu Thomas Watteyne @ EDERC 2010

3. 3 Conclusions Thomas Watteyne @ EDERC 2010 General: – ‘R’ is rather focused on large-scale and highly resource constrained – ‘D’ is rather focused on connection to Internet to facilitate Internet of Things Industrial Developments: – business takes off slower than anticipated, possibly because of defragmentation – endless proprietary solutions available with little inter-operability Standardization Activities: – IEEE have standardized a solution for robust communication – IETF is enabling seamless integration into the Internet – Open source implementations as enablers

4. 4 Multirate IEEE802.15.4 S. Lanzisera, A. Mehta, K. Pister, "Reducing Average Power in Wireless Sensor Networks Through Data Rate Adaptation," IEEE International Conference on Communications (ICC), June 2009. Thomas Watteyne @ EDERC 2010

5. 5 Multirate IEEE802.15.4 Decrease transmit power – Inefficient Variable Rate Signaling – Use excess SNR to send messages faster – Usually done to increase throughput Additional SNR PA Energy Savings Data RateVariable Rate Savings 0 dB0%250 kbps0% 2.6 dB16%500 kbps48% 5.6 dB31%1000 kbps72% 14.1 dB55%2000 kbps84% Thomas Watteyne @ EDERC 2010

6. 6 Multirate IEEE802.15.4 Thomas Watteyne @ EDERC 2010

7. 7 The Promise of Wireless Thomas Watteyne @ EDERC 2010

8. 8 The Promise of Wireless “I do not think that the wireless waves that I have discovered will have any practical application.” - Heinrich Hertz 1890 Thomas Watteyne @ EDERC 2010

9. Low-Power RF with the eZ430-RF2500 Dr. Thomas Watteyne Berkeley Sensor and Actuator Center University of California, Berkeley EDERC, 1 December 2010 Thank you.