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Fabrication of a Wireless Sensor Network for Extreme Environments

Fabrication of a Wireless Sensor Network for Extreme Environments. Faye Yuen EE 496/NASA Fellowship Design Review Presentation II Fall 2006. Project Overview. Create a network of autonomous motes to collect data in extreme environments (i.e. the Arctic) that analog Mars.

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Fabrication of a Wireless Sensor Network for Extreme Environments

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  1. Fabrication of a Wireless Sensor Network for Extreme Environments Faye Yuen EE 496/NASA Fellowship Design Review Presentation II Fall 2006

  2. Project Overview • Create a network of autonomous motes to collect data in extreme environments (i.e. the Arctic) that analog Mars. • Meet NASA Goals and Objectives. • Contribute to Dr. Chris McKay’s research.

  3. JN5121 Wireless Microcontroller External Power Supply (Solar) Water Sensor Computer Overall Block Diagram

  4. Water Sensor • Why it was chosen • How it works • How it will be powered • How it will be connected to the mote • How data will be collected and sent • Tests

  5. Water Sensor: Why it was chosen • Met needs – detects presence of water • Understandable technology • Compatible with motes • Reasonably priced • RoHS compliant

  6. Water Sensor: How it Works Water No Water Internal reflection of LED light to photo-transistor

  7. Water Sensor: Power • Sensor requires +5 V to +12 (Note: the JN5121 microcontroller requires 2.2V to 3.6V)

  8. Water Sensor: Connection to Mote • Pin 34 (Analogue to Digital input) on the mote’s Expansion Connector • Input Signal: ADC1 (connects to microcontroller)

  9. Water Sensor: Data Collection • FLASH memory holds the application program that the internal processor will run • Memory can be programmed by writing code in Bash shell and using the JN5121 Flash Programmer • Track Packets (data transmitted on positive or negative edge of clock) Programming Code…

  10. Water Sensor: Programming Code PRIVATE void vAdcDataLogger(uint16 *pau16DataBuffer, uint32 u32Length) { int i; /* configure Analogue Peripheral timings, interrupt & ref voltage */ vAHI_ApConfigure( E_AHI_AP_REGULATOR_ENABLE, E_AHI_AP_INT_DISABLE, E_AHI_AP_SAMPLE_2, E_AHI_AP_CLOCKDIV_500KHZ, E_AHI_AP_INTREF); while(!bAHI_APRegulatorEnabled); /* configure and enable DAC */ vAHI_AdcEnable(E_AHI_ADC_CONVERT_ENABLE, E_AHI_AP_INPUT_RANGE_1, E_AHI_ADC_SRC_ADC_1); while(TRUE) { for(i=0;i<u32Length;i++) { vAHI_AdcStartSample(); /* start capture */ while(bAHI_AdcPoll()); /*busy wait until capture complete */ pau16DataBuffer[i]=u16AHI_AdcRead(); /* store in buffer */ } } }

  11. Water Sensor: Tests • Detects water? • Accuracy? • Reliability? • Response to different water forms (ex. liquid, solid, gas)? • How much of dome needs to be covered by water for it to indicate its presence?

  12. Remaining Work • Build (waiting for supplies) • Test • Casing • Documentation… REVISE 496 REPORT! 

  13. Timeline for Completion Previous Gantt Chart (from Design Review I): ----- Completed ----- ----- Completed ----- ----- Completed ----- ----- Completed ----- ----- Waiting for Supplies ----- ----- Today ----- ----- Today ----- ----- n/a ----- ----- Waiting for Supplies ----- Revised Gantt Chart…

  14. Gantt Chart

  15. Thank You! Any Questions?

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