1. Final Presentation November 29, 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 Improvements PCB Enclosure Final Product Testing Production Cost References Questions

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] Competing Products Cyber Rain XCI Requires internet access Weather reports cover general area $499 MSRP

7. 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 $175

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

9. Physical Model

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 20 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. Improvements From Design 1 RTC from breakout board to through hole mountable components AC/DC converter resized from 12VDC to 6VDC Implementation of PCB from Breadboard

16. PCB

19. Enclosure NEMA 4 / IP65 Case with Clear Cover Dimensions of 7” x 6” x 3”

20. Final Product

22. Systems Test Test were conducted on the following components in this order after the arrival of the PCB: PCB Power supply Microprocessor LCD RTC Temperature Sensor Moisture Sensors Enclosure Entire System

23. Temperature Probe Test Data Ambient temp measured using a Fluke 189 temp probe and compared to LM 60 measurements.

24. Test Preparations Soil Preparation Bake at 225°F for 24 hours as per manufacturer recommendations Sample size of 16oz of dirt for each zone Test were performed in increments of 3.125 VWC

25. Moisture Sensor Test Data

26. Testing of Entire System Moisture (VWC) Current Moisture (VWC) Test 1 Moisture content greater than Moisture Setting Temperature greater than Temperature Setting Sprinkler should not operate Test 2 Moisture content less than Moisture Setting Temperature less than Temperature Setting Sprinkler should not operate Test 3 Moisture content less than Moisture Setting Temperature greater than Temperature Setting Sprinkler should operate

27. Operation and Testing

28. Production Cost Part #DescriptionQuantityPrice per UnitPrice per Unit for 100 VG 400Vegetronix Moisture Sensor229.95 PIC24HJ32GP202-I/SO-NDMicroprocessor14.202.74 LM60CIZ-NDTemperature Sensor10.920.62 LM2940CT-5.0-ND5V Regulator11.771.28 LM2937ET-3.3-ND3.3V Regulator11.981.44 F3167TR-ND1/2A Fuse10.29 EG4788-NDPush Button10.750.54 MOC3011M-NDOpto-coupler Triac Out20.820.45 516-1791-1-NDLED10.620.34 568-3687-NDTRIAC 600V 1A TO-9220.660.45 3310Y-001-103L-NDPotentiometer 10K12.561.62 CFAH2402A-YYH-JTLCD126.869.34 BEN-80PCBLKEnclosure124.54 14A-20-24B28-ND120/24V Transformer115.21 BP5063-5AC/DC Converter 5V 200mA16.984.53 59-211Pushbutton Switches39.017.36 DS1307+-NDRTC13.812.08 SER3302-NDCrystal11.440.82 P2.4KBACT-ND24 Ohm Resisitor20.090.02 P91BACT-ND910 Ohm Resistor10.090.02 P220KBACT-ND2.2K Ohm Resistor30.090.02 P4.3BACT-ND4.3K Ohm Resistor10.090.02 P2.2MBACT-ND2.2M Ohm Resistor20.090.02 478-5200-1-ND10pF Capacitor20.50.21 478-3150-1-ND0.1uF Capacitor20.50.21 CustomPCB119.0011.75 Total Cost of Parts for 1 Unit203.63161.94

29. 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/.

30. Any Questions?