H

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H A R C S
ome utomation and emote ontrolled ystem
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Members
Leader Marshall Crocker (CPE)
Brian Menikheim (CPE)
Kristy Harden (CPE)
Advisor Georgios Lazarou
Garland Mims (CPE)
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Problem Statement

• Modern homes have many appliances
• Operated manually
• A way is needed to automate appliances
• Operated via a computer
• Connected by Ethernet network
• Remote Controlled
• Controlled over the internet
• Provides security, convenience, and protection

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HARCS System
HARCS Module
HARCS Module
Internet
HARCS Module
Private Network
HARCS Module
HARCS Computer
HARCS Module
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HARCS Software Model
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Hardware Design

• Communicate with controlling computer
• Communications Hardware
• Physical Layer
• Implement IP Stack ARP, ICMP, UDP
• Interpret Commands
• Receive UDP/IP packets
• Read external input (buttons switches)
• Execute Commands

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Outlet Module

• Individual Outlet Control
• 2 outlets
• Operation Modes
• On, off, auto
• Push Buttons
• On, off
• LEDs
• Indicate state

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Design I Accomplishments

• Microcontroller processes and responds to
• ARP requests
• ICMP pings
• UDP control packets
• Input from control switches
• Control software
• GUI generated from XML
• Hardware control information stored in XML
• Communicates with and controls hardware
• Executes scheduled tasks

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Problems

• Relay switching from microcontroller not
  implemented
• Phone access and control not implemented

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Solutions

• Cant drive relay directly from microcontroller
  due to voltage spike from relay coil discharging
• Use Darlington pair current amplifier to drive
  relay and prevent voltage spikes

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New Designs

• Allow multiple hardware units to share the same
  IP and use broadcast to talk to each unit
• Use encryption for control packets
• Implement safety features for hardware

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PCB Layout
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Packaging

• Constraints 6x4x2 plastic casing houses
• two outlets on front
• one outlet for back
• two relays
• Ethernet controller
• PCB
• power supply

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Picture of Model

• Coming soon

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Hardware Testing

• Decrypt and encrypt control data
• Accept, execute, and respond to control packets
  including broadcasts
• Respond to input from external switches

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Software Testing

• Encrypt and decrypt control data
• Send and receive control packets including
  broadcast packets
• Execute scheduled events
• Use less than 10 Megabytes of computer memory
• Use less than 1 of processor time

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Questions

• ???