Session 40 Frederik Jonsson


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Session 40 Frederik Jonsson

  1. 1. Wireless in-situ Road Condition Sensor NetworkQiang Chen, Lirong Zheng & Frederik Jonsson iPack Vinnex Center, Royal Institute of Technology, Stockholm, Sweden
  2. 2. Why in-situ Road Condition Wireless Sensing?1. Gives almost real time monitoring of road condition2. Real time alarming is possible3. Via commercially available wide area wireless network, one can place such measurement set-up virtually anywhere and anytime if needed4. If needed data can be either send back via wireless WAN or stored in memory device
  3. 3. Application Requirements1. Temperature (-40C - +60C)2. Humidity (0-100% RH)3. Vibrations up to ~kHz4. Strain
  4. 4. System Architecture - An Overview Wide Area Network Central DB Client Enterprise Network WSN Server WEB Server Technician Monitoring and Analyzing Fresh Food Tracking Central Server Sensor Area Network Alarming Fresh Food Tracking Road End User Operation Center On-shelf Query Tracking and LocalizationMaster Sensor Node Slave Sensor Node
  5. 5. System Architecture -1 (First Layer Wireless Communications between Master Sensor Node and Central Server and End Users) Master Sensor GPS Node GSM/GPRS/3G Wireless Wide Area Network Real Time System Tracking Application Online Web (Internet)Text Message ALARM Data Statistics & Analysis E-mail Central Server & Database
  6. 6. System Architecture -2 (Second Layer Wireless Communications between Master Sensor Node and Slave Nodes) Master Sensor Node Slave Sensor Nodes Power Management 4.5V (placed inside road and road Step-up 5V Battery DCDC LDO 3.8V shoulder) Converter LDO 3V Road Coin Battery 3.3V CPU and Backup LDO Memory Sensors JTAG Temperature Sensors CPU and Backup Memory Communication Module sensor CO2 SignalSensor Interface JTAG RX (UHF 900MHz) Humidity Communication Module CPU TX (I-UWB) sensorOxygen Analogue GSM(GPRS)/GPS MicrocontrollerSensor MUX Module Accelerometers 2.4GHz RFID as MemoryEthylene Signal SD Memory RX (UHF 900MHz) communication Link Sensor Interface card TX (I-UWB)
  7. 7. System Operational Flow User Operations Operation Center Sensor Node Service User1 Registration Registration Wakeup Manager Management Runtime Service Selection Service Sensor Node Configuration API2 and Specification Authentication DB Configuration Manager Manager Sensor Data On-site Data Collection Processing3 User Login Driver Firmware Data Sensor Sensor Node Data Uploading Monitoring and4 Tracking Visualization DB Data Collector API Engine Alarming API Alarming Alarming Manager Controlling API Control Controlling Manager Sensor Node Executive Controller Driver Data5 Data Sharing Sharing Sleep Engine Sensor Node Sensor Node Web Function Web Service API Function
  8. 8. System Implementation -Sensor Selection1. T & RH sensor to meet requirement2. Vibration: accelerometer up to 5g with analog output for frequency>1KHz3. Strain gauge requires special technique, not integrated yet
  9. 9. System Implementation -Database Sensor DB Management DBPK User Infor UserID SensorAllocation Node Configuration PK NodeID SensorSelectT Temperature PK PK NodeID Time …... UserName UserPassword SensorSelectRH Value PK UserID ... ... PK ServiceID SensorPeriodT WAN Positioning PK NodeID SensorPeriodRH GPS ServicePackage ... PK NodeID StartTime UpLimitT PK NodeID PK Time PK ServiceID FinishTime DownLimitT PK Time Status UpLimitRH ContryID Price ... DownLimitRH Longitude AreaID payable ... Latitude CellID ... SmsIfAlarm altitude BaseStationID UploadToIP Distance UploadToPort Angle SmsToNumber AlarmPeriod Event Log AlarmEnabled PK NodeID UploadContry PK Time SimCardID SoftwareVersion Type ... Message Availability
  10. 10. System Implementation -Hardware Architecture Micro Panel 2.4G RF H&T Accele. CO2 GPS -SD Socket Tranceiver Sensor Sensor WAN Accele. RTC Adapter RTC 2.4G RF O2 MCU 2.4G Detector Sensor MCU RFID ... Sim Card Reader IR-UWB ... Ethy Tx Charger Power Sensor Jack Controller Power Management Management IR- Button Array ... H&T Li-ion Array Battery UWB Sensor BatteryMSN-SEN MSN-MAIN board MSN-SAN SSN board board board
  11. 11. System Implementation -Hardware Example
  12. 12. System Implementation -Acceleration Data Compresion 2 acce.(G) 1 0 2 2 -1 D waveform 1650 1700 1750 1800 1850 P waveform 1 acce.(G) 1acce.(G) samples 0 0 2 -1 -1 A waveform 1650 1700 1750 1800 1850 acce.(G) 1650 1700 1750 1800 1850 1 samples samples 0 -1 1650 1700 1750 1800 1850 samples
  13. 13. System Field Test Results(for Another Application)
  14. 14. Field Test -Vibration 2.5 1.5 2.5 1.5 1.5 2 1 2 1 1 1.5 0.5 1.5 0.5 0.5 acce.Z ( G )acce.X ( G ) acce.X ( G ) acce.Y ( G ) acce.Y ( G ) 1 0 1 0 0 0.5 -0.5 0.5 -0.5 -0.5 0 -1 0 -1 -1 Shock -0.5 -1.5 -0.5 -1.5 -1.5 0 5 10 15 0 0 5 5 10 10 15 0 15 0 5 5 10 10 15 time (50ms) 5 time (50ms) (50ms) time 5 5 time (50ms) time (50ms) 5 x 10 x 10 x 10 x 10
  15. 15. Conclusion1. An in-situ road condition monitoring system based on wireless sensor network and RFID technologies is presented.2. Sensor node placed inside road/road shoulder need special design, need further improvement3. Battery-less sensor node solution based on energy harvesting e.g., piezo-electric effect (vibration) and thermo-electric effect (temperature gradient) and/or solar cell4. To integrated strain gauge requires special interface circuits since the gauge is based on Winston-bridge principle
  16. 16. Thank You