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ECE 480 Fall 2011

ECE 480 Fall 2011. Team 5 Jordan Bennett Kyle Schultz Min Jae Lee Kevin Yeh. Introduction. Project Objectives: Design a sensor module, compatible to TI’s wireless sensing system (µMAVRK), for the immersion of concrete Specifically:

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ECE 480 Fall 2011

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  1. ECE 480 Fall 2011 Team 5 Jordan Bennett Kyle Schultz Min Jae Lee Kevin Yeh

  2. Introduction • Project Objectives: • Design a sensor module, compatible to TI’s wireless sensing system (µMAVRK), for the immersion of concrete • Specifically: • Relay temperature and humidity metrics from the sensor module, wirelessly, to a centralized unit (MAVRK) for further analysis • Implement code for communication from the µMAVRK to the MAVRK

  3. MAVRK Modular And Versatile Reference Kit. • Purpose • Used for rapid prototyping • Modules to encapsulate functionality • Advantage

  4. µMAVRK • µMAVRK is an extension of the MAVRK for remote monitoring. • Lower power (<10 ma) • RF Transceiver • µEVM • MSP430

  5. Example- Rapid prototyping of our own circuit • Dc to Dc boost converter • Temperature Circuit • Amplification Circuit • What if TI had modules for all three? • Program firmware to handle interaction between all three.

  6. Design Requirements - kyle • Functionality • Sense Temperature/Humidity of • Concrete • Communicate with uMAVRK • Send Signal to MAVRK • calibrate data received • Compatibility • Small enough to be embedded in concrete • Power source lasting at least 3 weeks • • end product that can be shown on public demonstration • Accuracy • +-1 degree tolerance on temperature • 1~3% RH Humidity error • multiple data point for comparison

  7. Design Approach - kyle

  8. Design Approach House of Quality

  9. Design Approach House of Quality Ranking 1 6 4 3 2 5 7

  10. Design Approach House of Quality • Design Measures • Signal conditioning • Sensor accuracy • Compatibility • Power efficiency • Timing • Portability Ranking 1 6 4 3 2 5 7

  11. Proposed Solution • Temperature Sensor • Wheatstone Bridge Circuitry • Voltage Amplification • ADC optimization • Humidity Sensor • Built-in signal conditioning Circuitry • Voltage Amplification • ADC optimization

  12. System Block Diagram - Power 5V Voltage Regulator Voltage Controlled Switch Resistive Humidity Sensor RTD sensor w/ Wheatstone Bridge Battery Source Instrumental Amplifier 3V Voltage Regulator Non-inverting Amplifier Non-inverting Amplifier GUI Display RF Filter RF Filter MAVRK motherboard ADC via CC430

  13. System Block Diagram - Enable ① P2.5 5V Voltage Regulator Voltage Controlled Switch ③P2.2 Resistive Humidity Sensor RTD sensor w/ Wheatstone Bridge Battery Source Instrumental Amplifier ②P2.2 3V Voltage Regulator ③P2.2 Non-inverting Amplifier Non-inverting Amplifier ③P2.2 GUI Display RF Filter RF Filter MAVRK motherboard ADC via CC430

  14. System Block Diagram ① P2.5 5V Voltage Regulator Voltage Controlled Switch ③P2.2 Resistive Humidity Sensor RTD sensor w/ Wheatstone Bridge Battery Source Instrumental Amplifier ②P2.2 3V Voltage Regulator ③P2.2 Non-inverting Amplifier Non-inverting Amplifier ③P2.2 GUI Display RF Filter RF Filter MAVRK motherboard ADC via CC430

  15. Theoretical Performance • Component Enabled in sequence • Varying Battery Voltage → Regulated Voltage • 0 ~ 70°C Temperature → 0 ~ 3.3V voltage • 0 ~ 100% Relative Humidity → 0 ~ 3.3V voltage • Optimized voltage data input to SAR ADC

  16. Testing & Simulation • TINA Simulation • Wheatstone Bridge • Instrumentation Amplifier • Buffer Amplifier • Proto board Testing • Temperature Sensor • Humidity Sensor • 5V Voltage Regulator

  17. Software Progress Timing diagram ① P.2.4 <= 1s ① P. 233 <= 2s ① ① ① Wake from Sleep in 15 minute interval Wake Up CC430 3.3V output from GPIO Turn on sensor board Temperature Output P2.4 : 0 ~ 3V P2.2 : 0 ~ 3V Temperature Output Read Digital input Temperature : Digital input -> Resistance of RTD calculated -> Converted to Temperature Humidity : Convert to Temperature & Humidity Wireless transmission MAVRK Mother Board GUI Sleep CC430

  18. Results • Hardware • Temperature reading with ±2°C error • Ambient Humidity Reading with 5% RH error • PCB fabrication & population • Software • GUI improvement(Database storage, Graph display

  19. Result • Voltage VS RTD resistance Graph • ambient humidity test result

  20. Future implementation • Hardware • Enclosure Design • Sensing humidity from within enclosure. • Software • Database on PC for packet store. • Accept inputs from several sensor module • Implementation of averaging algorithm • completion of curing Indication. • Algorithm to compensate for any differences

  21. Cost • Final cost w/ TI contribution. • Final cost w/o TI contribution.

  22. Demonstration • Video of analog circuitry test goes here

  23. Questions

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