Midterm Presentation Speed Detection System Using Underground Smart Sensors
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Midterm Presentation Speed Detection
System Using Underground Smart
Sensors
Students: Yossi Hod & David UzanSupervisor: Idan ShmuelId: 1433Semester: spring, 2013
Small sensors, with very low power
consumption
Planted under roads
Monitoring road status
The Wisdom Stone
Wisdom stone prototype
Block Diagram
Calculating vehicle speed Identifying the vehicle Mining traffic data
Project goals
Cheaper Works in all conditions Underground Independent Supplying traffic data
Advantages
Power supply Solar Panel: SW
Synchronization RFID: SW & HW
Challenges
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
Slave SW Routine
Sleep Wake
Synchronization → Sleep Sampling
Storing Getting the master’s samples Calculating the vehicle speed→ Sleep
a
Solution for speed detection
3 mV
Non-identical samplers.
Different frequencies.
Challenges following the calculation
TI 13.56 MHz RFID
Identifying the vehicle
Choosing the suitable component. Matching the component to Michrochip
technology. Identifying the vehicle within mili-seconds.
Challenges following TI RFID
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
Synchronization
Master
Two stones – one is master and the other is slave.Using the RTC, we can manage the synchronization.
Slave
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
Estimated Schedule