Mid Semester Presentation Senior Design II October 5, 2010

Appliance Texter Team Casey Cook - CPE PIC24 Coding, current sensor Perriea Wiley - EE PCB Design, Enclosure Steven Howell - EE Current Sensor Steven Cullen - CPE PCB Design, Enclosure Dr. Raymond Winton

Outline Introduction Problem Statement Solution Constraints Technical Design Constraints Practical Design Constraints Progress and Refinements Future Plans Testing Plan References

Problem The average user is concerned with leaving home without safely turning off all of their appliances. This can cause anxiety, stress, or home damages in the case of appliances that do not need to be left unattended for extended periods of time.

Solution Appliance Texter allows consumers the ability to remotely monitor and control the state of their home appliances. Wireless Monitor via (SMS) request on/off state of the appliance through a text message Wireless Controls via (SMS) Turn the appliance on or off with another text message

Project Constraints Technical Practical

Technical Constraints

Practical Constraints

Manufacturability - Size Appeal Users don’t want a bulky product. Compatibility Must fit the NEMA 5 standard [1] [2]

Social – Simple: Many Service Providers Large Coverage Area [3]

Social-Simple cont. Easy Setup Plug it in Insert SIM card Text User – Friendly Majority of population knows how to text [4] [5]

System Overview

Progress and Refinement

[6]Development of the working prototype from Design I

Current Sensor Proposed upgrade of current sensor to surface mount Complications Measuring Issues Timeliness/Deadlines Alternate Options

Microcontroller – PIC Upgrade to surface mount Benefits Space Practicality

SIM Card Push/Push SIM card connector Accessibility Convenience

Packaging Packaging options Box Style PCB behind all of the components Side by Side Style PCB and Power Supply on the side of the Package Half and Half Half of packaging PCB, Half power supply

PCB Design Current Progress Footprints and accessory parts laid Current Sensor

Schematic

PCB layout

Sub-System Tweaking Upgraded BJTs used to control relay Alterations to microprocessor code to delete messages Alteration to code to text the user if the relay appears to be malfunctioning Changes to the current sensor Added a capacitor to the voltage rail

Future Plans [7]

Enclosure for the device

System Testing Upon completion of PCB, testing of soldered components will occur Overall Unit tests for the system in the box Testing will be for functionality

References [1] Razor Book Online Available 2010 [Online] Available: [2] Text Messaging, 2010 [Online] Available: [3] Roaming Coverage Chart, 2009 [Online] Available: [4] Text, 2010 [Online] Available: [5] AT&T wireless provider 2010, [Online] Available: [6] [7] RLV Cacher 2010 [Online] Available: p vsp_400.jpg

Questions?