Docstoc

Rechargeable Battery System _REBATEM_

Document Sample
Rechargeable Battery System _REBATEM_ Powered By Docstoc
					Mid Semester Presentation
     October 4, 2011
                        Team Members
Kevin Wellman                                     Adam Teague
              Duties:                                         Duties:
              Real Time Clock                                 Power Circuit
                                 Dr. Winton
              Website                                         PCB Design


Electrical Engineering                            Electrical Engineering




Reginald Lott                   Faculty Advisor   Matthew Adkins
              Duties:                                         Duties:
              User Interface                                  Sensors
              Microprocessor                                  PCB Design
              Programming

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      Temperature
 Sensor         Sensor



                                 Sprinkler
               Microcontroller   Interface

Real Time
  Clock

                 Power Supply
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          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    The WCSC must sense temperatures from 20 to 50 degrees
Sensor Range   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      The device must be easy to use and
                Convenience   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) less than Moisture Setting
   Moisture content
   Current
   Temperature less than Temperature Setting
   Sprinkler should
Moisture (VWC) not operate
                    Test 3
    Moisture content less than Moisture Setting
    Temperature greater than Temperature Setting
    Sprinkler should operate
PCB
PCB
Enclosure
             Timeline for SD2
               August   September   October   November




Hardware
Refinement

Software
Refinement

PCB Design
PCB
Populating
Enclosure

Testing
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/.
Any Questions?

				
DOCUMENT INFO
Categories:
Tags:
Stats:
views:3
posted:3/31/2012
language:
pages:27