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Wireless Phone Tic-Tac-Toe Josh Morelli. Project Description The purpose is to illustrate the interfacing of hardware and wireless phones using standard.

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Presentation on theme: "Wireless Phone Tic-Tac-Toe Josh Morelli. Project Description The purpose is to illustrate the interfacing of hardware and wireless phones using standard."— Presentation transcript:

1 Wireless Phone Tic-Tac-Toe Josh Morelli

2 Project Description The purpose is to illustrate the interfacing of hardware and wireless phones using standard Dual-Tone Multi- Frequency (DTMF) signals. Because of delays associated with wireless phone transmissions, a time- insensitive project was necessary. Hence, Tic-Tac-Toe.

3 System Block Diagram

4 Operational Description Player A presses a button 1-9. Player B’s phone receives the tone and sends it to the DTMF decoder through the 2.5mm headset jack. Player A’s phone does the same thing simultaneously Decoder outputs a 4-bit representation of button pressed to the HC12

5 Operational Description (cont) HC12 immediately sends the same signal to a DTMF generator Generator sends identical tone back to Player A for acknowledgement (ACK) Once ACK is verified, HC12 processes the signal and illuminates the appropriate LED on the display board

6 Operational Description (cont) HC12 then processes a simple algorithm to determine if a winning sequence has been lit If a winner is found, the winning sequence of LED’s is flashed Play continues until a winner is found, or reset button is pressed

7 Algorithm Description First checks one diagonal and all horizontal possibilities, then rotates pattern 90 degrees to check other diagonal and vertical possibilities.

8 Algorithm Description (cont) HC12 will logically re-order board positions for pattern recognition. New order will allow rotation simply by bit- shifting one 8-bit register. Original Re-ordered Rotated

9 Display Board The display board will be the primary output component of the user interface. A 3x3 array of bi-color (red/green), three-leaded LED’s will be used to represent the traditional X’s and O’s.

10 Display Board (cont) The LED array will be controlled by two 16-bit serial shift registers (74LS673) to reduce the number of HC12 pins used. Two 10-bit high-output buffers (TI P/N SN74ABT827) will provide the driving current for the LED array. Each LED will have a voltage divider attached to each of its 2 anodes to control proper voltages and currents.

11 Display Board Schematic

12 DTMF Decoder 18-pin DIP IC (TDK P/N: TSC 75T202) No input signal filtering required 4-bit output, binary representation of 12 possible standard phone buttons Uses a common, inexpensive reference crystal ( MHz)

13 DTMF Generator 16-pin DIP IC (TI P/N: TCM5089) 4-bit row, 4-bit column input, combined to select output frequencies Output frequency error is ≤0.73% Also uses the MHz crystal

14 Cost Estimation


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