1. Remote Keystroke Retrieval System Kevin Butler Omar Martino Eric Hicks

2. Project Description Interface a PIC16F84 microcontroller with external EEProm to record and store all keystrokes from a given AT or PS/2 keyboard. Transmit the stored data using a TX/RX transmitter pair to a separate device Display the received data on a monitor screen.

3. General Functionality KeyboardCPU Recorder CPU Mobile

4. Interface Functionality PIC16F84 EEProm ReceiverTransmitter From MobileTo Mobile

5. Interface Functionality Cont’d Receiver EEProm II PIC16F84 Transmitter From Recorder To Recorder

6. Parts Description Microcontrollers Memory RF Systems Keyboard

7. PIC16F84 Microcontroller Coding – RISC Assembly 32 instructions – PIC Basic Hardware – 18 Pins 13 pins available for input/output specification – Requires 4 MHz clock – 5V power supply

8. Microchip EEProm (2kbit-512kbit packages) Interface/PinOuts Hardware Storage – Each lower case character is 24 bits – Our storage capacity using this setup will be 80 characters to 21,000 characters! – Max storage approximately 20 pages (font 12, double spaced)

9. Keyboard 6-pin Mini-DIN (PS/2): 1 - Data 2 - Not Implemented 3 - Ground 4 - Vcc (+5V) 5 - Clock 6 - Not Implemented Male (Plug)

10. Testing Phases Phase 1- Handling Keystrokes (In Progress) – Ignores mouse movement – Displays scan codes on LED’s – Still need special keystroke recognition (F1, Win95, etc.) Phase 2- Storing Data (In Progress) – Must implement higher capacity EEProm Phase 4- Transmitting (Upcoming) – Use microcontroller to start and end transmission of data from EEProm Phase 3- Keyboard Emulation (Completed) – Use microcontroller to simulate a working keyboard.

11. Phase 1 & 2- Recording Keystrokes PIC16F84 receives clock and data from keyboard, and “routes” the data to EEProm Ignores mouse movements PICBasic I2COUT/I2CIN handles all serial transmission – Control byte, address byte, data byte

12. Test Circuit Diagram

13. Phase 3- Keyboard Emulation PIC16F84 manually switches clock pin high and low, to simulate keyboard clock Memory accessed and sent as it was received initially (FIFO) Ignoring crucial keys (Win95, F1, etc) is still an issue – Each of these keys has a two part make code that starts with the byte E0, should be easy to ignore, but hard to display what key was typed.

14. Phase 4- Transmission PIC16F84 receives control signal and initiates EEProm data extraction Data is obtained byte by byte from EEProm, and sent to transmitter serially using the I2COUT instruction. Data is received and processed exactly as in Phase 1 & 2

15. Recording Unit Diagram

16. Mobile Unit Circuit Diagram

17. Timeline

18. Uncertainties Transmission Clarity/Distance – Might need error correcting codes – Have not tested TX/RX as of yet Code – Have not established a clear strategy for filtering unwanted keystrokes Power Consumption – May be able to power transmitter from PIC

19. Milestone Goals Milestone 1 – Demonstrate transmission of stored data to remote device. – Display data on screen from “remote device” – Completion of Phase 3 Milestone 2 – Demonstrate completed prototype – Integration of all phases – Working keystroke filtering Ignore or Recognize

20. Questions?