1. Mid Semester Presentation February 24, 2011

2. Team Members Duties: Real Time Clock Website Kevin Wellman Electrical Engineering Reginald Lott Adam Teague Matthew Adkins Duties: Power Circuit PCB Design Duties: User Interface Microprocessor Programming Duties: Sensors PCB Design Dr. Winton Faculty Advisor

3. Overview: Problem Solution System Overview Constraints Technical Practical Approach Progress

5. Problem Current residential sprinkler systems are inadequate in the following areas: Efficiency Ease of use Cost

6. Digital Sun S. Sense Add-on device Battery operated (sensors and control unit) $199 MSRP [1]

7. Cyber Rain XCI Requires internet access Weather reports cover general area $499 MSRP [2]

8. Solution Water Conserving Sprinkler Control Periodically monitors moisture content and temperature Operates on user-defined schedule Requires no external devices for modifying settings Costs less than $150

9. System Overview Microcontroller Moisture Sensor Temperature Sensor Power Supply Sprinkler Interface Real Time Clock

11. Technical Constraints: Name Description Moisture Sensor Range The WCSC must be able to sense the volumetric water content of the soil from 20 to 50 percent. Outputs The WCSC must be able to output 24 V AC at 0.6A. Display The WCSC display must provide relevant information and options to the user, and it must be readable in well or dimly lit environments.

12. Technical Constraints (Cont.): Name Description Temperature Sensor Range The WCSC must sense temperatures from 15 to 50 degrees Fahrenheit. Voltage The WCSC must operate from a standard 120V wall outlet.

14. Practical Constraints TypeConstraintDescription EnvironmentalDurabilityThe device must be able to operate in harsh conditions. UsabilityCustomer Convenience The device must be easy to use and change watering schedule.

15. Environmental Sensors must withstand a variety of weather elements Heat Cold Water Resistant Control unit encasement durability Must be rugged enough to withstand incidental impact

16. Usability The unit must be simple to configure and operate. Water scheduling Time changes Display and Button Interface

18. Moisture Probe ModelPower Consumption Prong TypePriceComponent Chosen VG400< 800uAsingle$29.95 EC-510mAdouble$91.95 [3][4]

19. Power Control Model Solid StateSize in mmPriceComponent Chosen TRIAC #568-3687-ND Yes4.2x4.8x5.2$0.78 Relay # 306-1152-2-ND No10x5x5 $19.34 [5][6]

20. Power ModelRatioPower Rating PriceComponent Chosen Plug in Transformer 120/24VAC20VA$16.18 On board Transformer 120/24VAC 20VA $13.78 [7][8]

21. Timeline JanuaryFebruaryMarchApril Research Ordering Parts Design Constructing and test Prototype Working Prototype

22. Progress

23. Pic uC

24. Progress RTC

25. Progress Temp

26. Progress Opto-Coupler TRIAC

27. Simulated 24v AC Load

28. References: [1] Sprinkler Warehouse. [Online]. Available: http://www.sprinklerwarehouse.com/Ground-Soil-Moisture-Sensors- s/7666.htm. [Accessed: January 18, 2011].http://www.sprinklerwarehouse.com/Ground-Soil-Moisture-Sensors- s/7666.htm [2] Beanworthy. [Online]. Available: http://homegarden.beanworthy.com/CyberRain-XCI-16Zone-Automated-Sprinkler- Controller/A/B000ZHTXEC.htm. [Accessed: January 18, 2011].http://homegarden.beanworthy.com/CyberRain-XCI-16Zone-Automated-Sprinkler- Controller/A/B000ZHTXEC.htm [ 3] “VG400 Moisture Probe” [Online] Available: http://www.vegetronix.com/Products/VG400/.http://www.vegetronix.com/Products/VG400/. [4] “EC-5” [Online]. Available: http://www.decagon.com/products/sensors/soil-moisture-sensors/ec-5-soil-moisture-small- area-of-influence/http://www.decagon.com/products/sensors/soil-moisture-sensors/ec-5-soil-moisture-small- area-of-influence/ [5] “Triac" [Online] Available: http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=568- 3687+ND%09%09http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=568- 3687+ND%09%09 [6] “Relay.” [Online] Available: http://parts.digikey.com/1/parts/1791165-relay-reed-hi-rf-bga-3-3v-spst-b10-03b.html: http://parts.digikey.com/1/parts/1791165-relay-reed-hi-rf-bga-3-3v-spst-b10-03b.html [7] “Plug in Transformer." [Online] Available: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=T1009- ND.http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=T1009- ND. [8] “On Board Transformer.” [Online] Available: http://parts.digikey.com/1/parts/999877-transf-lo-pro-dual-12vac-1-66a- pl20-24-130b.htmlhttp://parts.digikey.com/1/parts/999877-transf-lo-pro-dual-12vac-1-66a- pl20-24-130b.html

29. Any Questions?