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Mid Semester Presentation February 24, 2011 Team Members Kevin Wellman Adam Teague Duties: Duties: Real Time Clock Dr. Winton Website PCB Design Electrical Engineering Reginald Lott Power Circuit Electrical Engineering Faculty Advisor Matthew Adkins Duties: Duties: User Interface Sensors Microprocessor Programming PCB Design Electrical Engineering Electrical Engineering Overview: Problem Solution System Overview Constraints Technical Practical Approach Progress Problem Current residential sprinkler systems are inadequate in the following areas: Efficiency Ease of use Cost Digital Sun S. Sense Add-on device Battery operated (sensors and control unit) $199 MSRP [1] Cyber Rain XCI Requires internet access Weather reports cover general area $499 MSRP [2] 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 System Overview Moisture Sensor Temperature Sensor Microcontroller Real Time Clock Power Supply Sprinkler Interface Technical Constraints: Name Description Moisture Sensor The WCSC must be able to sense the volumetric water content of the Range soil from 20 to 50 percent. Outputs Display The WCSC must be able to output 24 V AC at 0.6A . The WCSC display must provide relevant information and options to the user, and it must be readable in well or dimly lit environments. 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. Practical Constraints Type Constraint Description Environmental Durability The device must be able to operate in harsh conditions. Usability Customer Convenience The device must be easy to use and change watering schedule. 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 Usability •The unit must be simple to configure and operate. • Water scheduling • Time changes • Display and Button Interface Moisture Probe Model Power Consumption Prong Type Price VG400 < 800uA single $29.95 10mA double $91.95 EC-5 [3][4] Component Chosen Power Control Model Solid State Size in mm Price TRIAC #568-3687-ND Yes 4.2x4.8x5.2 $0.78 Relay #306-1152-2-ND No 10x5x5 $19.34 [5][6] Component Chosen Power Model Ratio Power Rating Price Plug in Transformer 120/24VAC 20VA $16.18 On board Transformer 120/24VAC 20VA $13.78 [7][8] Component Chosen Timeline January Research Ordering Parts Design Constructing and test Prototype Working Prototype February March April Progress Progress Pic uC Progress RTC Progress Temp Progress Opto-Coupler TRIAC Simulated 24v AC Load References: [1] Sprinkler Warehouse. [Online]. Available: http://www.sprinklerwarehouse.com/Ground-Soil-Moisture-Sensorss/7666.htm. [Accessed: January 18, 2011]. [2] Beanworthy. [Online]. Available: http://homegarden.beanworthy.com/CyberRain-XCI-16Zone-Automated-SprinklerController/A/B000ZHTXEC.htm. [Accessed: January 18, 2011]. [3] “VG400 Moisture Probe” [Online] Available: http://www.vegetronix.com/Products/VG400/. [4] “EC-5” [Online]. Available: http://www.decagon.com/products/sensors/soil-moisture-sensors/ec-5-soil-moisture-smallarea-of-influence/ [5] “Triac" [Online] Available: http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=5683687+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 [7] “Plug in Transformer." [Online] Available: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=T1009ND. [8] “On Board Transformer.” [Online] Available: http://parts.digikey.com/1/parts/999877-transf-lo-pro-dual-12vac-1-66apl20-24-130b.html Any Questions?