REMOTE SWITCHING by a74QIjce

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									REMOTE SWITCHING



    Tyson Mortimer
     Roger Bremer




     Project Proposal
       Project #62
   ECE345-Senior Design
      TA: Shao Hsia
Introduction:
The project we have selected to work on is the design of a wireless system that controls
various outlets throughout a home. This will facilitate a person to operate all of the lights
in their house with one remote control. It will also be possible to control devices other
than lights. We decided to work on this project because it is something that we both
think we will be able to use in our own homes. We are currently unaware of any retail
products that provide this operation although they may exist and we have just never seen
them.

Project Goals and Functions:
We are planning on having the remote control eight different outlets. The number eight
has been decided about because it is a power of two and should thus make representation
of the different outlets easiest. The user will press the button on the remote associated
with the outlet that they desire to activate or deactivate. The remote will then send to the
receiver the binary representation of that outlet. We are planning that the range of the
remote will be approximately 150 ft. The receiver will take in the number of the outlet
and enable it if disabled or disable in if enabled

Block Diagram:




     User’s
     Remote             Encoder          Transmitter
     Control




                                                                  Relays to
          Receiver          Decoder           Processor
                                                                  Outlets


User’s Remote Control:
This is the physical interface between the user and the circuit. It will contain eight
buttons, one for each outlet to be controlled.

Encoder:
This will change which button was pressed into a stream of bits representing the outlet to
toggle.

Transmitter:
An RF circuit that will change the bits into a RF signal and use the connected antenna to
send the signal over the air.
Receiver:
Using an antenna it takes in the RF signal at the appropriate frequency and demodulates it
into useful data.

Decoder/Processor:
The signal, bit stream, is interpreted to find which outlet is being controlled. This
information is then used to determine if the outlet needs to be turned on or off. After this
is decided, a signal is sent to the appropriate relay either enabling or disabling the outlet.

Relay:
The relay is the hardware device that prevents or permits current flow to the outlet of
choice.

Performance:
The product will be able to consistently transmit, receive and switch within the specified
radius.

Test Procedures:
We will need to monitor the Bit Error Rate, power through the relays, Bit Rate, and
transmitted/received power (to determine range).

Schedule:

Week     Work
 2/7     Project Proposal
2/14     Order parts, Finalize bit sequences, begin Hardware Design
2/21     Design Review, Preliminary hardware setup
2/28     Continue construction of remote control and transmitter/receiver interface
 3/6     Testing of transmitter/receiver, Begin Microcontroller Coding
3/13     Spring Break
3/20     Continue coding and construct relay circuitry
3/27     Create external logic for relays
 4/3     Finalize Microcontroller code, Verify functionality of relay circuit
4/10     Final test and debug
4/17     Project Documentation
4/24     Demo and Presentation
 5/1     Final Paper
Cost:

Labor:    Salary = $30.00/Hr          Hours to completion = 90/person
         Labor Cost = 30 * 2.5 * 90 * 2 people = $13,500.00

Parts:

Relays=$5.00*8=$40
Linx Transmitter/Reciever=$Available
Antennas = $10
Circuitry Elements = $Available
Microcontroller = $Avalable

Total Parts Costs = $50

TOTAL COST = $13,550.00

								
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