Mid Semester Presentation February 24, 2011. Team Members Duties: Real Time Clock Website Kevin...
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Transcript of Mid Semester Presentation February 24, 2011. Team Members Duties: Real Time Clock Website Kevin...
Mid Semester Presentation February 24, 2011
Team MembersDuties:
Real Time Clock
Website
Kevin Wellman
Electrical Engineering
Electrical Engineering
Electrical Engineering
Electrical Engineering
Reginald Lott
Adam Teague
Matthew Adkins
Duties:
Power Circuit
PCB Design
Duties:
User Interface
MicroprocessorProgramming
Duties:
Sensors
PCB Design
Dr. Winton
Faculty Advisor
Overview:ProblemSolutionSystem OverviewConstraints
TechnicalPractical
ApproachProgress
ProblemCurrent residential sprinkler systems are inadequate
in the following areas:EfficiencyEase of useCost
Digital Sun S. SenseAdd-on deviceBattery operated (sensors and control unit)$199 MSRP
[1]
Cyber Rain XCI
Requires internet accessWeather reports cover general area$499 MSRP
[2]
SolutionWater Conserving Sprinkler Control
Periodically monitors moisture content and temperature
Operates on user-defined scheduleRequires no external devices for modifying settingsCosts less than $150
System Overview
Microcontroller
Moisture Sensor
Temperature Sensor
Power Supply
Sprinkler Interface
Real Time Clock
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.
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.
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 ProbeModel Power
ConsumptionProng Type Price Component
Chosen
VG400 < 800uA single $29.95
EC-5 10mA double $91.95
[3][4]
Power Control Model Solid State Size in mm Price Component
Chosen
TRIAC #568-3687-ND
Yes 4.2x4.8x5.2 $0.78
Relay #306-1152-2-ND
No 10x5x5 $19.34
[5][6]
PowerModel Ratio Power
Rating Price Component
Chosen
Plug in Transformer
120/24VAC 20VA $16.18
On board Transformer
120/24VAC 20VA $13.78
[7][8]
TimelineJanuary February March April
Research
OrderingParts
Design
Constructing and test Prototype
Working Prototype
Progress
Progress
Pic uC
ProgressRTC
Progress
Temp
ProgressOpto-Coupler
TRIAC
Simulated24v AC Load
References:[1] Sprinkler Warehouse. [Online]. Available:
http://www.sprinklerwarehouse.com/Ground-Soil-Moisture-Sensors-s/7666.htm. [Accessed: January 18, 2011].
[2] Beanworthy. [Online]. Available: http://homegarden.beanworthy.com/CyberRain-XCI-16Zone-Automated-Sprinkler-Controller/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-small-area-of-influence/
[5] “Triac" [Online] Available: http://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
[7] “Plug in Transformer." [Online] Available: 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.html
Any Questions?