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