Final Semester Presentation Senior Design I April 20, 2010

Appliance Texter Team Casey Cook - CPE PIC24, GSM setup Perriea Wiley - EE Switching subsystem, current sensor Steven Howell - EE Switching subsystem, current sensor, power supply Steven Cullen - CPE PIC24 coding, troubleshooting Dr. Raymond Winton

Outline Introduction Problem Statement Solution Constraints Technical Design Constraints Practical Design Constraints System Overview Subsystem Testing System testing Rainy/Sunny Day Cases Project Progression Goals for Senior Design II 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

[6]

Prototype Setup

Subsystem Testing Power Supply Current Sensor Relay GSM Module Microcontroller

Power Supply Switching power supply has a large range of options. 3.4V was chosen for operation

Power Supply Resistance (Ohms)Voltage (volts)Current (amps)

Current Sensor Test setup for current sensor to prove accuracy Pic24 Interface with current sensor

Current Sensor cont. ApplianceADC Voltage Measured Current (in Amps) Calculated Current Percent Error Can Opener % Quesadilla Maker % 40W lamp % Toaster % Tube TV %

Relay Relay Test showing relay is able to handle 120VAC appliances

GSM Module AT commands to control module operation

GSM Module cont.

GSM module transmitting text message

Microcontroller PIC24 Microcontroller layout and testing station Bootloader serial interface to the PIC 24 Used to monitor output from testing code

System Testing

System Testing cont. Sunny Day Case Sending turn off command Rainy Day Case Sending unknown command (test message)

Progression [7]

Technical Constraints Progress Technical Constraint Status PowerComplete CurrentComplete MemoryComplete CommunicationComplete ConnectionComplete

Design II Objectives PCB Design and Fabrication Enclosure Design and Construction Optimizing Integrated Current Sensor Relay Smaller Size Functionality Testing

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] The Gamer 2009 [Online] Available: [7] RLV Cacher 2010 [Online] Available: p vsp_400.jpg

Questions?