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Cell Extender By Faisal Al-Ali Hisham Dhaifullah Advisor: Prof. Miller

Cell Extender By Faisal Al-Ali Hisham Dhaifullah Advisor: Prof. Miller. Objectives. Pair and Bond Bluetooth compatible cell phone with embedded Bluetooth chipset on Cell Extender

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Cell Extender By Faisal Al-Ali Hisham Dhaifullah Advisor: Prof. Miller

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  1. Cell Extender By Faisal Al-Ali Hisham Dhaifullah Advisor: Prof. Miller University of Michigan-Dearborn College of Engineering and Computer Science Spring/Summer 2009

  2. Objectives • Pair and Bond Bluetooth compatible cell phone with • embedded Bluetooth chipset on Cell Extender • Receive cell phone data over the air through Bluetooth and transmit that data over twisted pair phone line to touch-tone phone. • Alert user of an incoming call on touch-tone phone University of Michigan-Dearborn College of Engineering and Computer Science Spring/Summer 2009

  3. Objectives (continued) • Answer incoming call and establish two-way communication • with cell phone • Hang-up call from touch-tone phone and terminate • communication on cell phone end. University of Michigan-Dearborn College of Engineering and Computer Science Spring/Summer 2009

  4. Block Diagram PIC Line Detection Circuit Noise filtering + leakage current protection Bluetooth chipset Pulsed AC Wave Generator Telephone Cell Phone University of Michigan-Dearborn College of Engineering and Computer Science Spring/Summer 2009

  5. Block Diagram Continued(power requirements) Phone Line Transformer(s) PIC Microcontroller Bluetooth Chipset AIMS power Inverter Pulsed AC Wave Generator Power Regulator University of Michigan-Dearborn College of Engineering and Computer Science Spring/Summer 2009

  6. Major Design Components • WT-32 BlueGiga SMD Bluetooth Chipset • WT-32 BlueGiga Breakout Board • PIC-16-F-690 (8-bit) Microcontroller • AIMS 120 Watt Slim Line Power Inverter with USB port University of Michigan-Dearborn College of Engineering and Computer Science Spring/Summer 2009

  7. Design Subsystems The design project consists of the following subsystems: • Pulsed AC Wave Generator: • Line Detection Circuit • PIC-16-F-690 Interface • WT-32 Bluetooth Chipset & Breakout Board University of Michigan-Dearborn College of Engineering and Computer Science Spring/Summer 2009

  8. Pulsed AC Wave Generator • The pulsed AC Wave generator is the inverted power output from the AIMS inverter that is fed directly into the phone line. • Its connection to the phone line is separated by a fast switching transistor that that is calibrated for a three second open switch state and a three second closed switch state. This creates the familiar ringing sequence we get from our landline phone. University of Michigan-Dearborn College of Engineering and Computer Science Spring/Summer 2009

  9. Line Signaling Circuit • Its’ sole purpose is to detect when a touch-tone phone is in the on-hook and off-hook position • A very critical component of the design project, its function is needed to determine when to terminate the pulsed AC signal to the phone line University of Michigan-Dearborn College of Engineering and Computer Science Spring/Summer 2009

  10. PIC 16-F-690 Interface • It will determine whether a phone line is busy or not in order to open the connection to the Bluetooth chipset. • It will send the commands to the WT-32 Bluetooth chipset to hang up and/or answer incoming call as determined from the line detection circuit. University of Michigan-Dearborn College of Engineering and Computer Science Spring/Summer 2009

  11. WT-32 BlueGiga Bluetooth Chipset & Breakout Board • WT-32 Bluetooth chipset contains an internal Bluetooth antenna that communicates with other Bluetooth devices. It can be preprogrammed for headset, cable replacement, or stereo transmission applications. • The Breakout Board is a mount for the Bluetooth chipset which allows the user to readily connect and disconnect wires from it allowing for easy, rapid prototyping without the need for soldering wires. University of Michigan-Dearborn College of Engineering and Computer Science Spring/Summer 2009

  12. Design Specifications • Dimensions: 5” X 3.5” X 1.5” • Input voltage: 12 V DC • Maximum Phone Line Voltage: 12 V • Maximum Phone Line Current: 300 mA • Signal to Noise Ratio: 40 dB (POTS standard)

  13. Cost Analysis University of Michigan-Dearborn College of Engineering and Computer Science Spring/Summer 2009

  14. Questions ? University of Michigan-Dearborn College of Engineering and Computer Science Spring/Summer 2009

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