Nifty Car: Security system

Updated 2000-1-9

Connections to the microcontroller

Sensors
- Vibration sensor
  - Has adjustable major and minor outputs
- Motion sensor
  - Has adjustable major and minor outputs
- Door open
  - May circumvent the dome light switch.
  - Connector C401, between dome light and ground (door switches), is in driver's side dash.
- Car running state
  - Connected to ignition switch
- Infrared detector
- GPS
Real time clock
- DS1302
- Operates on 2v to 5.5v
- Uses 3 pins with CCS code
ISD4002 voice playback chip
- Record supported only to setup the system, not during normal operation
- For external speaker
- Include in later versions
- Operates on 2.7v to 3.3v
Sirens
- Interior
- Exterior
  - Horn
  - Sound prompt
    - Not loud
  - Maybe other siren
Ignition kill control
- ???
Arm/Disarm/Panic remote control
- Infrared or RF remote control
- Use HCS361 or HCS410 for remote
- Use HCS515 for receiver

States

Alarm levels
- Inactive
  - Alarm does not function
  - Change states only on user command or car ignition
  - Ignition enabled
- Active
  - No trouble
  - Wake on input change
  - Change states depending on input change
  - Ignition disabled
- Caution
  - Indication of person nearby
  - Sound a prompt briefly to warn person
  - Ignition disabled
  - Triggered by:
    - 1^st stage shock
    - 1^st stage motion (?)
- Danger
  - Indication of impact or broken glass
  - Sound louder prompt and interior siren briefly to warn person
  - Ignition disabled
  - Triggered by:
    - 2^nd stage shock
    - Triggers of the caution held for 10s (?)
- Entry
  - Indication of intruder within the car
  - Sound all sirens for a while after trigger is lost
  - Ignition disabled
  - Triggered by:
    - 2^nd stage motion
    - Invalid authorization
Initial
- Inactive state
Ignition
- Car started
  - Enter this state regardless of previous alarm state
  - Go to the code entry state
- Authorization
  - Prompt user to enter code
  - Give user 30s to enter a code
  - Give user 4 tries to enter correct code
  - If codes incorrect:
    - Go to entry state
  - If code correct:
    - Go to running state
- Running
  - Activate all other embedded systems
  - If door(s) opens:
    - Wait for door(s) to close
    - Go to authorization state
- Car stopped
  - If disable command recieved while in this state:
    - Go to inactive state
  - Wait for the doors to be closed for at least 30s
  - Go to active state