Voice Controlled Cursor

1
Voice Controlled Cursor

• Arthur Wood
• Jeff Keeney

2
PS/2 Physical Interface
6-pin Mini-DIN (PS/2) Pin 1 Data Pin 2 Not
Implemented Pin 3 Ground Pin 4 Vcc (5V) Pin
5 Clock Pin 6 Not Implemented
3
PS/2 Electrical Interface
PS/2 Electrical Interface
Data and Clock lines are both open-collector with
pull-up resistors to 5V. Both lines are
normally held at 5V, but can be pulled to ground
by asserting logic "1" on C and D. As a
result, Data equals D, inverted, and Clock equals
C, inverted
4
PS/2 Communication Interface

• Data high, Clock high Idle state.
• Data high, Clock low Communication
  Inhibited.
• Data low, Clock high Host Request-to-Send

Computer to Mouse

• Mouse-to-Computer The Data line changes state
  when Clock is high and that data is valid when
  Clock is low.
• Computer-to-Mouse Data line changes state when
  Clock is low, with exception of ACK

Mouse to Computer
5
PS/2 Movement Data Packet
L,R,0 Left, Right, Middle ButtonsXS,YS Sign
Bit of X and YXY,YY Overflow bit for X and
YX0-X7 Movement in X DirectionY0-Y7
Movement in Y Direction
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Voice II Speech Recognition Kit

• Board consists of Voice II module, speaker,
  microphone, pins, short buttons
• Multi-Trigger Continuous Listening (MCL) Mode
  allows for programming of 3 trigger words with
  5 commands under each trigger

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Role of Voice II Kit

• Trigger 1 Move
• Up, down, left, right
• Trigger 2 Scroll
• Up, down
• Trigger 3 Click
• Left, right, double

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Role of Voice II (contd)

• After computer boots it must recognize presence
  of PIC ? handshaking protocol
• PIC sets Voice II to MCL mode and closes I/O path
• Upon hearing trigger word Voice II waits for
  command
• If command word is then recognized, appropriate
  pins are set to high
• Pins drive PIC to send corresponding 3 byte data
  packet to computer