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Mid Semester Presentation Draft February 17, 2011.
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Mid Semester Presentation Draft February 17, 2011
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Transcript of Mid Semester Presentation Draft February 17, 2011.
Mid Semester Presentation DraftFebruary 17, 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
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
Power Output
Real Time Clock
Technical Constraints:Name
Description
Display The WCSC display must provide relevant information and options to the user, and it must be readable in well or dimly lit environments.
Voltage The WCSC must operate from a standard 120V wall outlet.
Outputs The WCSC must be able to output 24 V AC at 0.6A .
Technical Constraints (cont.):
Name
Description
Temperature Sensor Range
The WCSC must sense temperatures from 15 to 50 degrees Fahrenheit.
Moisture Sensor Range
The WCSC must be able to sense the volumetric water content of the soil from 20 to 50 percent.
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
Supply Output Price Component
Chosen
VG400 3.3-20 VDC 0-3 VDC $29.95
Hydra Probe II 9-20 VDC RS485 $395
[1][2]
Power Control Model Trigger
Voltage Contact Trigger
Current
Price Component Chosen
TRIAC 1.5 V 50mA $0.78
Relay 3.3 V 60mA $19.34
[3][4]
PowerModel Ratio Power
Rating Price Component
Chosen
Plug in Transformer
120/24VAC 20VA $16.18
On board Transformer
120/24VAC 20VA $9.10
[5][6]
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] “VG400 Moisture Probe” [Online] Available: http://www.vegetronix.com/Products/VG400/.
[2] “Hydra Probe II.” [Online]. Available: http://www.stevenswater.com/catalog/stevensProduct.aspx?SKU=%2793640%27
[3] “Triac" [Online] Available: http://search.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=568-3687+ND%09%09
[4] “Relay.” [Online] Available: http://parts.digikey.com/1/parts/1791165-relay-reed-hi-rf-bga-3-3v-spst-b10-03b.html
[5] “Plug in Transformer." [Online] Available: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=T1009-ND.
[6] “On Board Transformer.” [Online] Available http://search.digikey.com/scripts/DkSearch/dksus.dll?lang=en&site=US&WT.z_homepage_link=hp_go_button&KeyWords=14A-20-24B28
Any Questions?
