ECE 345 Senior Design

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					    ECE 345: Senior Design
 Project #42Waterfall Marquee
 Joanne Messerges
 Mazin Qureshi
 Adam Zook
            The Waterfall
 Microcontroller takes user input and outputs
  logic to control gates.
 Electrically-controlled gates create
  characters.
 Falling water displays characters
Animated Waterfall

1   2   3   4   5   6   7
           Hydro-rific
      Innovative Advertising
 Unique
 Attention-grabbing
 Engages viewers
 Small-scale makes it affordable and
  practical for small companies
            Project Goals
 Translate user input
 Construct gates operable up to 36Hz
 Minimize power consumption
 Minimize cost
       Review Original Design
         Block diagram of system
USER

                                    EEPROM
         PC             HC12




          Gates/Solenoids/
              Valves               Boost Converters
The Project Build
             HC12 Code
 Stores a user phrase of up to 25 characters
 Outputs ten 7-bit words for each letter

    EXAMPLE: Enter Phrase: A
    Code Outputs: 00001000
                  00011100
                  00111110
                  01100011
                  01100011
                  01111111
                  01111111
                  01100011
                  01100011
                  01100011
      Options Offered by Code
   Scroll Direction



                       Versus




   Control of Feed Rate to Gates
                                       Prompt User to Enter Phrase

Flow Chart                             Store Character in Memory


                                                                                       YES
       NO
                                             Is the phrase 25
                 NO                            characters?


       Enter?                                                                          Any
                                                                                       Key?
                                                        YES

                                                                             NO
                                           Is the “Direction”
                                           switch logic high?


                   YES                                                    NO

          Process First Letter First                            Process Last Letter First



                                       Output Character Sequence




                                                                              YES
                                             External clock
                  NO                         transition from
                                               high to low?
          Inversion Option
 Characters can be written in air or water
 Can switch at any time during operation
 Utilizes logic gates
      Amplification of Signal
 0 to 5 Volts (TTL)  12 Volts (solenoids)
 Ability to handle high current
 Require fast switching
The Gates




        Actuator
        Movement
Final Gate
Waterfall Frame
Waterfall Frame
         The Final System

USER   Block Diagram of Final System

                                 Logic Gates
           PC        HC12




                   Gates          MOSFETs
Testing
Determine Operating
    Frequency
   Equal Flow Rates: At vt = AB vB

       Bernoulli’s Equation:
     1 2 1                     1
 Pr  vP  gygy  P PB   gy vB  gyB
        r 2 v T
            r
                  2
                  r
                     1 v  2
                      T   B
                              2
                              B   B

     2                   2
                               2

                     
           vB  vT  g  yT  y B 
         1 2
         2
                 2




                1 2  AB 
                         2
                 vB 1  2   gh
                2  AT 
                          
Determining Operating
  Frequency, cont’d
          vB  2gh  1.32m / s

                 v  2gh  1.5
Time for water to travel1.32m / s inches = .0289 s
                   B




       Frequency = 1/.0289s = 34.6 Hz

Solenoid Max. Operating Frequency = 45 Hz
     Temperature Limitations of the Solenoid

                        180
                        160
Temperature (Celsius)




                        140
                        120
                        100                                       20 Hertz
                                                                  30 Hertz
                        80
                                                                  40 Hertz
                        60
                        40
                        20
                         0
                              0   10   20          30   40   50
                                       Time (minutes)
                     Exponential Relationship Between Pin
                            Distance and Torque
             25.00



             20.00



             15.00
Torque (N)




             10.00



              5.00



              0.00
                 0.00   2.00   4.00   6.00    8.00      10.00    12.00   14.00   16.00   18.00
                                             Pin Distance (mm)
      Friction vs. Leakage


Friction




             Leakage
        Challenges/Successes
   Choosing letter size—solely based on calculations
   Choosing gates—needed to select design and
    commit to it
   Neglected current needs
   Gates—need 2 traits for good operation
            1)low friction
            2)low leakage
   Last minute problems
        Recommendations
 Use EEProm if more characters are desired
 Thinner gates
 Professionally made fast-action water
  valves
 Choosing a project with less extensive
  mechanical difficulties
Questions/Comments

				
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posted:10/16/2011
language:Norwegian
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