Central Control Unit by hcj


									The Smart-Green House
       Group 1:
         Rafael Abreu
       Danny Gonzalez
         Kaltrin Gjini
      Richee Ramsahoye
          The Smart-Green House
• Home automation taken to the next level
• The Smart-Green House Project offers:
   – Power outlet calibrations
   – Creation of a timed schedule for managing the house
   – Growth and maintenance of plants based on water and lighting
             Goals and Objectives
• Create a smart customizable system to control a house
• Create a system to aid in the growth and upkeep of plants
  with little to no waste of light and water
• Make it user friendly with a minimal learning curve
• Low cost
• Low power consumption
•   5 voltage limit for user interface
•   25 volt power supply for Green Unit System
•   Weight limit is constrained to be 65 lbs
•   500 Watt limit for power consumption
•   $420 budget for entire project
Growing System

 Richee Ramsahoye
                     Growing System
• The growing system will use an
  aeroponics approach for
  nurturing the plants
• Aeroponics is a growing method
  in which the roots of the plants
  are hanging in the air.
• This will increase the efficiency of
  use of resources among the
• The system will consist of a
  sprinkler system with a sprinkler
  nozzle to distribute the nutrients
  solution, an LED light source to
  trigger photosynthesis, and a
  water refilling system to refill the
Block Diagram of the Growing System
                   LED Light Source
• LED light source will be made by hand in an arrangement that adhere to
  the goals of keeping the cost of materials and the power consumption low
  while triggering photosynthesis as efficiently possible
• With these goals, the LEDs are cascaded in series into multiple parallel
• The LEDs to be used are red(~630nm) and blue(~470nm)
• Proposed Design uses 7.93 to 12 Watts
• Blue LEDs
   – Maximum Forward Current: 20mA
   – Voltage Operational Range: 3.5V – 4.5V
• Red LEDs
   – Maximum Forward Current: 30mA
   – Voltage Operational Range: 1.7V – 2.6V
• Circuit uses 50 Red LEDs and 40 Blue LEDs
• Current is controlled by the series resistor on
  the end of each branch
• Amount of Blue LEDs are reduced because
  they produce more light than the Red LEDs
        Nutrients Detection System
•This system will measure the electro-conductivity of the water within
   the reservoir
•This will result in the amount of nutrients that are present within the
•Since the electro-conductivity of the water is essentially the
   resistance of the water, the electro-conductivity can be calculated
   like a resistance with respect to the geometry of the probe
•Equation to calculate Electro-Conductivity of Solution with respect to
   the resistance: R= l/A p
•With this equation, the resistance of the solution can be determined
   and therefore, the voltage gain from the amplifier will give the
   effective resistance of the solution
•This equation will determine the geometry of the probe and the
   conductance of the element
        Nutrients Detection Schematic

• Positive gain amplifier where the probe is treated as the input resistor
• This will result in a voltage amplification with the gain being affected by the
  resistance of the probe
• This voltage will lead into an rectification circuit to give the effective resistance
  of the water and leads into a comparator
• The Preset Voltage is user specified and will determine if there needs to be
  more nutrients to be distributed into the reservoir
     Nutrients Distribution System

• The comparator from the Nutrients Detection System will return a positive
  voltage if the nutrients needs to be distributed
• Thus, a voltage regulator is used to turn on and power the solenoid valve
  which will start to distribute the nutrients concentration into the reservoir
• If the comparator returns a negative voltage indicating there is enough
  nutrients, the voltage regulator will be off thus shutting the solenoid valve
  off as well
              Water Refilling System
• System will work as a means to fill the reservoir when there is an
  insufficient amount of water
• Probe will be used to close the circuit indicating that the reservoir is at an
  acceptable level
• Uses an inverting amplifier configuration to amplify the voltage from the
• Amplified voltage leads into a comparator which will output the difference
  with the preset voltage
• Output from the comparator already serves to power the solenoid when
  the probe is opened
• When probe is closed, the voltage from comparator will ideally be zero
• If the voltage is insufficient to power the solenoid valve, the reservoir will
  be at an acceptable level.
• Accuracy is not a key factor for this part of the design
Water Management Schematic
Central Control Unit/ User
        Kaltrin Gjini
• Purpose of the central control unit is to have a physical button
  interface to control the sensors near the plant.

• The button interface allows the user to go through all the
  sensors and find problems if present.

• Also has inputs to allow for connections to sensitive areas
  where knowing if electric power flowing is important.

• It is: low cost, efficient in power consumption, and easy to
Overall Design of User Interface
     Design of Central Control Unit
• There are 8 inputs with 10 outputs.

• Overall power use of central control unit is below 30 W.

• It is logic based, sending a high turns the selected I/O unit on
  and a low turns it off.

• Input allows for varying voltages depending on application.
         Design of Button Interface
• There are 10 on/off buttons for switching.

• Button for counting up and down through sensors.

• R/W button for reading or writing to a sensor.

• Dimensions: 7cm x 12cm for the board, counter buttons
  0.5 cm in diameter, and On/Off and R/W at 1 cm in diameter.
                  Button Interface

Allocated areas
for buttons.
Design of Control Core/Dual Signal
Physical Board
Wireless Control Unit

    Rafael A. Abreu
      What is the Wireless Control Unit?

Its used to:
• Automatically turn devices on/off
• Measures watts of the operating
• Control Power Phase Output to

•Weight less than 2lb

•Max Power measure 1800W

•Power Measurement accuracy of ±3%

•Dimension less then: L- 6" W- 3" D-2.5 "

•Communication Range up to 90ft
                      Power Supply

•LM7850C Linear Voltage Regulator:
  -Output Range 5V
  -Output Current up to 1.5A
  -Internal Short-Circuit
   Current Limiting
Sensor for Calculating Power
                ACS756 Hall-Effect Current
                Controlling Power
Zero-Crossing     Microcontroller
Lowering The Power

            Firing Angle   Percentage Power





Layout of the Wireless Control Unit
Software & Communications

       Danny Gonzalez
        Wireless Communications
• The wireless technologies we considered were ZigBee,
  Bluetooth and Wifi (802.11), CDR03A module and arduino
  Ethernet shield.
• CDR03A and the Arduino Ethernet shield were the best
  wireless communication technology available based on price,
  compatibility and range
• Good amount of sample PHP and Arduino code available
• Wireless internet connections will be required in order to
  connect the user with the board controlling the features.
         Comparing Technologies
Technology   Operating    Power          Transmission   Cost ($)
             Distance (m)                Speed

CDR03A       33           5mA            2000 baud      5.00

Ethernet     World-wide   9V             100            40.00
Ethernet     1-100        ---------------- 10-1000      3-49.99
Bluetooth    10m          Low            1-3            50.00-60.00

Wifi (802.11) 50-67       High           11-200         34.99-79.99

Zigbee       25           Low            0.03           118.00-
               Software Overview
• Arduino C modified language. Will be used to program the
  chips and the Ethernet shield.

• JavaScript, html, css, PHP will be used on the website
Use Case Diagram
Class Diagram
                           Project Expenses

   Overall Cost                                         410.96
      Software         0

Button Interface                 127.62

Growing System                   132.45

Wireless Control                   150.89

• Power consumption was measured at 40 watts
  with respect to 0 load
• All pumps are fully functional and valves were
  checked for leaks
• Button Interface was tested at every load
• Wireless Control System was tested for range
  – Tested at 100 feet with no interference

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