1. Midterm Presentation Speed Detection System Using Underground Smart Sensors Students: Yossi Hod & David Uzan Supervisor: Idan Shmuel Id: 1433 Semester: spring, 2013

2.  Small sensors, with very low power consumption  Planted under roads  Monitoring road status The Wisdom Stone

3. Wisdom stone prototype

4. Block Diagram

5.  Calculating vehicle speed  Identifying the vehicle  Mining traffic data Project goals

6.  Cheaper  Works in all conditions  Underground  Independent  Supplying traffic data Advantages

7.  Power supply  Solar Panel: SW  Synchronization  RFID: SW & HW Challenges

8. Master SW Routine  Idle  Waking the slave for synchronization  Synchronization → Idle  Sensing that vehicle is approaching  Waking the slave for sampling  Sampling  Sending the samples to the slave → Idle

9. Slave SW Routine  Sleep  Wake  Synchronization → Sleep  Sampling  Storing  Getting the master’s samples  Calculating the vehicle speed → Sleep

10. a Solution for speed detection 3 m V

11.  Non-identical samplers.  Different frequencies. Challenges following the calculation

12.  TI 13.56 MHz RFID Identifying the vehicle

13.  Choosing the suitable component.  Matching the component to Michrochip technology.  Identifying the vehicle within mili-seconds. Challenges following TI RFID

14. Existing power sources: Rechargeable battery – 3.7 Volt Non-rechargeable battery – 3.6 Volt USB cable – 5 Volt Solar panel – need to be added as part of the project. Power supply

15. Synchronization Two stones – one is master and the other is slave. Using the RTC, we can manage the synchronization.

16.  RTC resolution is only 1 second.  Choosing the period of time to synchronize.  Setting the synchronization interrupt as top priority.  Protocols – two options:  Sending the time.  Setting up the two RTCs simultaneously. Challenges following synchronization

17. Estimated Schedule