Transcript Duties
Mid Semester Presentation October 4, 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 Improvements Systems Test PCB Enclosure SD2 Timeline References Questions 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 Physical Model 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 20 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 Improvements RTC from breakout board to through hole mountable components AC/DC converter resized from 12VDC to 6VDC Implementation of PCB from Breadboard Systems Test Testing of the systems will be completed after arrival of the PCB. Test will be conducted on the following components in this order: PCB Power supply Microprocessor LCD RTC Temperature Sensor Moisture Sensors Enclosure Entire System Testing of Entire System Test 1 Moisture content greater than Moisture Setting Temperature greater than Temperature Setting Sprinkler should not operate Test 2 Moisture (VWC) Moisture content less than Moisture Setting Temperature Current less than Temperature Setting Sprinkler should not operate Moisture (VWC) Test 3 Moisture content less than Moisture Setting Temperature greater than Temperature Setting Sprinkler should operate PCB PCB Enclosure Timeline for SD2 August Hardware Refinement Software Refinement PCB Design PCB Populating Enclosure Testing September October November References: [1] Sprinkler Warehouse. [Online]. Available: http://www.sprinklerwarehouse.com/GroundSoil-Moisture-Sensors-s/7666.htm. [Accessed: January 18, 2011]. [2] Beanworthy. [Online]. Available: http://homegarden.beanworthy.com/CyberRain-XCI16Zone-Automated-Sprinkler-Controller/A/B000ZHTXEC.htm. [Accessed: January 18, 2011]. [3] “VG400 Moisture Probe” [Online] Available: http://www.vegetronix.com/Products/VG400/. Any Questions?