Ness Ppt


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Ness Ppt

  1. 1. NeSSI Wireless Sensor / Actuator Networking March 7, 2001 John Crawford VP, Business Development Crossbow Technology, Inc.
  2. 2. Background / Outline <ul><li>Crossbow: Five years in the digital sensor subsystem business </li></ul><ul><li>New CrossNet Wireless sensor / actuator architecture </li></ul><ul><li>Sensor / Actuator “Node” uses open (Bluetooth) standard </li></ul><ul><li>“ Smart I/O (SI/O)” devices provide standards-based Plug-and-Play I/F to almost any sensor </li></ul>
  3. 3. Bluetooth Background <ul><li>Bluetooth: Norse king who brought together all of the warring factions </li></ul><ul><li>Backed by Ericsson, Motorola, Microsoft and others </li></ul><ul><li>Designed to replace IR port on PCs, etc. with RF approach </li></ul><ul><li>Goal: PCs, PDAs, Cell phones, and peripherals can communicate easily. </li></ul>
  4. 4. Bluetooth Overview <ul><li>Bluetooth RF Specification </li></ul><ul><ul><li>2.4 GHz, Frequency hopping spread spectrum </li></ul></ul><ul><ul><li>721 kbps data rate </li></ul></ul><ul><ul><li>0 dBm (1 mW) nominal 10 meter range </li></ul></ul><ul><ul><li>20 dBm (100 mW) nominal 100 meter range </li></ul></ul><ul><ul><li>Automatic retransmit until message receipt is verified (avoid lost data) </li></ul></ul><ul><ul><li>Various data security levels can be implemented </li></ul></ul>
  5. 5. Bluetooth vs. Other Technologies Bluetooth 802.11b Proprietary Manufacturers Ericsson, CSR, Motorola Proxim; Aironet; Breezecom Various Frequency 2.4GHz 2.4GHz 49MHz, 900 MHz, 2.4GHz Modulation FHSS, 1600/sec DSSS FM;FH;DS Datarate 720kb/sec 11Mb/sec 288kb/sec Range 10m/100m 100m Various Robustness Very secure Secure Various Power 1mw/100mw ?? Various
  6. 6. Basic Wireless Operation <ul><li>Inquiry – returns Bluetooth addresses of all devices within range </li></ul><ul><li>Establish synchronized link—master/slave </li></ul><ul><li>Establish a piconet – up to 7 slave devices in synchronized communication </li></ul><ul><li>Establish a larger or more complex network </li></ul><ul><ul><li>Unlimited additional slave devices “parked” </li></ul></ul><ul><ul><li>Master switches from piconet-piconet </li></ul></ul><ul><li>Hopping 1500/sec => effective latency O/M milliseconds (10s of milliseconds for larger networks) </li></ul>
  7. 7. Crossbow Node Architecture 300’ or 30’ Range ARM7 uP A/D 16 bit Mux SENSOR/ACTUATOR SENSOR/ACTUATOR SENSOR/ACTUATOR SENSOR/ACTUATOR Bluetooth Radio Chip Baseband Controller SRAM for Data SIO serial comm Flash RAM SIO +5.00 Supply Power 5V DC Temp Sensor AA B a t t e r y DC-DC +3.5 & 5V Voltage Converter BATTERY PACK (OPTIONAL) Radio Module Optional Power Amp AA B a t t e r y AA B a t t e r y AA B a t t e r y
  8. 8. Crossbow SoftSens Software <ul><li>Provide data to the user on whatever platform is desired (PC, laptop, PDA, web, etc.) </li></ul><ul><li>Make data accessible to a variety of data acquisition and analysis packages (LabView, C++, Excel, Visual Basic, etc.) </li></ul><ul><li>Manages all Bluetooth node operations (Inquiry, Connect, Piconet) </li></ul><ul><li>Track nodes as they come into and out of radio range. </li></ul><ul><li>Interrogate nodes for configuration and sensor information </li></ul><ul><li>Transfer data. </li></ul><ul><li>Configure operating modes and parameters. </li></ul><ul><li>Establish common time stamp for all Nodes. </li></ul><ul><li>Upload new Node and SIO code over radio. </li></ul><ul><li>Allow SIOs to be user configured for TEDS. </li></ul>
  9. 9. Plug and Play Sensors / Actuators <ul><li>“ Smart” Sensor I/O (SI/O): </li></ul><ul><ul><li>Make all sensors electrically consistent and smart </li></ul></ul><ul><ul><li>Each sensor used interchangeably with CrossNet Bluetooth Wireless node </li></ul></ul><ul><li>Normalize raw analog signal for node input </li></ul><ul><ul><li>4-20mA, DC Voltage, RTD, Thermocouple </li></ul></ul><ul><li>Store Electronic Data Sheet and Calibration Data for sensor </li></ul><ul><ul><li>Keep this info with the sensor in the SI/O </li></ul></ul><ul><ul><li>Info includes: physical parameters, measurement range, desired engineering units, calibration information, user defined fields (sensor name, etc.) </li></ul></ul><ul><ul><li>Based on IEEE 1451.2 TEDS/SCEDS standards </li></ul></ul><ul><ul><li>Sensor can be added to measurement setup quickly and reliably </li></ul></ul>
  10. 10. SI/O Architecture NODE SENSOR/ACTUATOR SENSOR/ACTUATOR SENSOR/ACTUATOR SENSOR/ACTUATOR SIO Programmable Signal Conditioning Output (0 - 5V) uP w/ flash memory TEDS Serial Communication SENSOR Sensor Excitation Sensor Output (low level) Terminal block for user to attach sensor Inexpensive cable, high level analog sensor signals
  11. 11. Typical Wireless I/O Application Level Sensor T/C Sensor Pressure Sensor Flow Sensor
  12. 12. CrossNet Summary <ul><li>Open standards-based wireless sensor network </li></ul><ul><li>Bluetooth-based wireless sensor/actuator “Node” </li></ul><ul><li>Programmable “Smart” Sensor I/O device so most sensors and actuators can be included in the wireless network </li></ul><ul><li>Software layer on Node and PC to manage wireless network, organize and communicate data, interface to popular data acquisition and control software </li></ul><ul><li>Next: how to adapt for NeSSI </li></ul>