Bluetooth Auto-Silencer Final Presentation Senior Design I

Barbara Fountain -EE - Power Controls and embedded layout Delos McManus -EE -Antenna control/feedback and embedded layout Mike Brokhoff -CPE - Programming mobile device Brantley Brokaw -CPE - Programming microprocessor Team Members

Faculty Advisor Dr. Pan Li Assistant Professor Ph.D., Electrical and Computer Engineering, University of Florida, 2009 B. Eng., Electrical Engineering, Huazhong University of Science and Technology, Wuhan, China, 2005 Academic/Research and Fields of Interest:Wireless Networking Wireless Communication Mobile Computing Computer Networks

Problem Solution System Overview Constraints Hardware Testing o Power Supply o Microcontroller Software Testing o Android Application Complete System Testing Remaining Tasks/Timeline Questions Overview

As cell phones become more common in everyday life, the need for cell phone etiquette has become even more apparent in certain areas of public life. Problem Incoming Call

Use Bluetooth technology to develop a hardware and software combination that will automatically silence cellphones. Solution Incoming Call

System Overview

Technical Constraints NameDescription Power SupplyMust use 120 VAC. Software Must operate on the Android version 2.2 as a test base. Further expansions of mobile operating platforms are planned. Frequency Band Must transmit in a bandwidth between 2.4 and 2.48 GHz in order to comply with the Bluetooth standard. Software Response Timing Cannot have a latency longer than 3 seconds. Transmission Distance The transmitter must have a line-of-sight range of 100 feet without obstructions.

Practical Constraints Economic Political

Economic Constraint The transmitter must cost no more than $150, and application software will be free to all mobile device users. ComponentPrice Bluetooth Modem - BlueSMiRF RP- SMA $ GHz Duck Antenna RP-SMA - Large $9.95 PIC24HJ32GP202 Microcontroller$3.50 PCB Fabrication$35.00 Miscellaneous Circuit Elements - Total $4.58 Total$117.98

Political Constraint The BAS must not violate the Communications Act of [2]

Hardware Testing Power Supply Microcontroller

Power Supply 120 VAC is rectified to 6.0 VDC. 6.0 VDC is bucked down to 3.3 VDC. The voltage for each device was measured across its coupling capacitor, as shown below.

Power Supply All measure values are within tolerance of both the PIC24HJ32GP202 and the Bluetooth module. Expected Value (Volts) Measured Value (Volts) Percent Error (%) Rectifier Voltage Regulator

Microcontroller The microcontroller communicates with the Bluetooth Module. The communication was observed via a USB Logic Analyzer.

USB Logic Analyzer Test

Software Testing Android Application

FSM Diagram

Android Application Emulator o Creating Graphical User Interface o Control Ringer State o System Timer Mobile Device Deployment o Turn On/Off Bluetooth module o Control discovery o Read devices being discovered o Response Timing

Graphical User Interface

Control Ringer and Timer

Bluetooth Control and Discovery Reads

Worst case Latency

Latency Testing Average Delay2.3 seconds Expected Delay3.0 seconds Percent Error-24.44%

Complete System Test

Technical Constraints Overview NameDescriptionComplete Power SupplyMust use 120 VAC. Software Must operate on the Android version 2.2 as a test base. Further expansions of mobile operating platforms are planned. Frequency Band Must transmit in a bandwidth between 2.4 and 2.48 GHz in order to comply with the Bluetooth standard. Software Response Timing Cannot have a latency longer than 3 seconds. Transmission Distance The transmitter must have a line-of-sight range of 100 feet without obstructions.

Distance Testing Problem: Transmission Distance is too large for small rooms Solution: Switch added to vary transmission power

Timeline AugustSeptemberOctoberNovember Research Hardware Design Prototyping Testing

Senior Design II Goals Finish Implementing Android GUI PCB Design Deploy Application to Android Market Expand application to another OS

[1] Wikipedia, “Mobile phone,” Wikipedia. [Online]. Available: [Accessed Aug. 31, 2010]. [2] Federal Communications Commission, “Sale or Use of Transmitters Designed to Prevent, Jam or Interfere with Cell Phone Communications is Prohibited in the United States,” Federal Communications Commission, July 27,2005. [Online]. Available: [Accessed: Aug. 31, 2010]. [1] Wikipedia, “Mobile phone,” Wikipedia. [Online]. Available: [Accessed Aug. 31, 2010]. [2] Federal Communications Commission, “Sale or Use of Transmitters Designed to Prevent, Jam or Interfere with Cell Phone Communications is Prohibited in the United States,” Federal Communications Commission, July 27,2005. [Online]. Available: [Accessed: Aug. 31, 2010]. References

Questions?