Configuration File

To facilitate easy configuration, all settings are located in the configuration.js javascript file, with each overarching setting class listed as a variable. (IE. system, headingTape, speedTape, etc.) We will cover setting details here:

Modifying Settings on the Pi

• Connect your computer to the stratux wifi network.
• Login to the pi using ssh: (Password should be 'raspberry')

ssh 192.168.10.1 -l pi

• CD to the proper directory:

cd /var/www/ahrs

• Modify the configuration.js file with nano (or your preferred command-line editor)

nano configuration.js

• Change settings as needed.
• Save and exit (nano) with ^x (control-x) then y then enter
• After editing is complete, exit ssh

exit

Settings

System

/** ******************************** SYSTEM ******************************** **/
var system = {
  // Overall system settings
  overlay_active: true, // Enable warning overlay on startup
  ahrs: {
    // Settings for the overall AHRS
    updateTimeout: 750, // Time (in ms) required for a metric to be set as invalid
    reloadAfterTimeoutCount: 4 // Number of times the timeout has to be hit before a reboot
  },
  fmu: {
    // Settings for the overall AHRS
    updateTimeout: 1500 // Time (in ms) required for a metric to be set as invalid
  },
  checkActiveTime: 2250,
  // Websocket URL for situation
  websocket_url: "ws://raspberrypi.local/situation",
  enable_ahrs_ws: false,
  // Websocket URL for FMU Update
  fmu_url: "ws://raspberrypi.local:8888",
  enable_fmu: false, // Enable FMU support - in development
  cpu_temp_warn: 70, // Temp at which the 'Temp' banner will be displayed (C)
  allow_reload: true, // Allows the app to automatically reload if it detects an issue
  status_url: "http://raspberrypi.local/getStatus",
  push_url: "http://raspberrypi.local",
  simulate: false
};
/** ******************************** ****** ******************************** **/

Variable	Description
ahrs.updateTimeout	Time (in ms) required for an AHRS source to timeout.
fmu.updateTimeout	Time (in ms) required for an FMU source to timeout.
checkActiveTime	Time (in ms) required for the whole system to reboot if no valid sources.
websocket_url	URL of the AHRS websocket from stratux. Should remain constant.
fmu_url	URL of the fmu websocket from stratux. In development.
enable_fmu	Enable flag for the FMU. In development, recommend that this be false.
allow_reload	Allows the system to auto-reload if the data connection to stratux fails.
status_url	URL of the status webpage from stratux. Should remain constant.
simulate	Simulation flag. Set to true to enable AHRS simulation mode.

Heading Indicator

/** ******************************* HEADING ******************************** **/
var headingTape = {
  // Compass / track tape at the bottom of the AHRS
  range: 30, // Visual range of degrees present at one time. IE: a
  // value of '30' allows 30 degrees visiable at all times.
  ticks_per_number: 10 // Specifies how often numbers are written on the tape.
  // A val of '10' means every 10th number is shown
};
/** ******************************* ******* ******************************** **/

Variable	Description
range	Range of degrees continually in view for the heading tape.
ticks_per_number	Signifies how often a tick is displayed. 10 -> 0°, 10°, 20°,...

Speed Indicator

/** ******************************** SPEED ********************************* **/
var speedTape = {
  // Speed tape on the left of the AHRS
  lowerSpeed: 0, // Lower displayed speed given in the selected unit
  upperSpeed: 200, // Upper displayed speed given in the selected unit
  speeds: [
    // Speed color band configurations given in the selected unit
    {
      color: COLORS.WHITE,
      start: 55,
      end: 115
    },
    {
      color: COLORS.GREEN,
      start: 64,
      end: 140
    },
    {
      color: COLORS.YELLOW,
      start: 140,
      end: 171
    },
    {
      color: COLORS.RED,
      start: 171,
      end: 200
    }
  ],
  units: UNITS.KTS // Units for displaying speed and for speed config.
};
/** ******************************** ***** ********************************* **/

Variable	Description
lowerSpeed	Speed at the bottom of the speed tape. Usually 0.
upperSpeeds	Speed at the top of the speed tape.
speeds	Array containing multiple speed bands (colored 'arcs' on a traditional indicator'. See COLORS for possible arc colors.
units	Unit for displaying speed. See UNITS for possible units (speed).

Altimeter

/** ******************************* ALTITUDE ******************************* **/
var altTape = {
  units: UNITS.FEET, // Units for displaying altitude
  altimeter_setting_unit: UNITS.INHG, // Units for entering altimeter settings (INHG, HPA or MILLIBAR)
  default_kollsman_inhg: 29.92, // Default kollsman setting for the baro altimeter (inHg)
  default_kollsman_millibar_hpa: 1013.2, // Default kollsman setting for the baro altimeter (millibar / hPa)
  kollsman_memory_seconds: 18000 // Number of seconds the kollsman setting will be remembered (cookie)
};
/** ******************************* ******** ******************************* **/

Variable	Description
units	Unit for displaying altitude. See UNITS for possible units (distance).
altimeter_setting_unit	Default unit for the altimeter setting (UNITS.INHG, UNITS.HPA or UNITS.MB).
default_kollsman_inhg	Default kollsman (altimeter) setting in inHg.
default_kollsman_millibar_hpa	Default kollsman (altimeter) setting in hpa or millibar.
killsman_memory_seconds	Number of seconds the altimeter setting will be remembered after setting (upon app restart).

V-Speed

/** ******************************** VSPEED ******************************** **/
var vspeedTape = {
  units: UNITS.FPM // Units for displaying vertical speed
};
/** ******************************** ****** ******************************** **/

Variable	Description
units	Unit for displaying vertical speed. See UNITS for possible units (speed).

AHRS Tape

/** ********************************* AHRS ********************************* **/
var ahrsTape = {
  // AHRS in the center of the AHRS
  limits: [30, -30], // Limits for the degrees that are displayed. Values
  // outside this range show chevrons
  degrees_in_view: 25, // Degrees in constant view (range)
  chevrons: 4, // Number of chevrons shown passed the limits
  chevron_space: 140 // Space given to each chevron (sizing)
};
/** ********************************* AHRS ********************************* **/

Variable	Description
limits	Total degree range for pitch. Chevrons past these values.
degrees_in_view	Total degrees in continuous view.
chevrons	Number of chevrons shown passed the degree limit.
chevron_space	Space given to each chevron (style change).

Slip-Skid

/** ****************************** SLIP SKID ******************************* **/
var slipSkid = {
  multiplier: 6,  // Arbitrary scale for tuning slip-skid movement
  display: true
};
/** ****************************** SLIP SKID ******************************* **/

Variable	Description
multiplier	Unitless scale for tuning slip-skid movement. Modify if you notice incorrect indication scale.
display	Whether or not to display the slip-skid indicator.

Turn Coordinator

/** *************************** TURN COORDINATOR *************************** **/
var turnCoordinator = {
  display: true
};
/** *************************** TURN COORDINATOR *************************** **/

Variable	Description
display	Whether or not to display the turn coordinator.

G-Meter

/** ******************************** G-Meter ******************************* **/
var gMeter = {
  display: true
};
/** ******************************** ******* ******************************* **/

Variable	Description
display	Whether or not to display the g-meter.

Satellite Count

/** ****************************** Sat Count ******************************* **/
var satCount = {
  display: true
};
/** ****************************** ********* ******************************* **/

Variable	Description
display	Whether or not to display the satellite counter.

Constants

UNITS

Variable	Name	Unit Type	Unit System
UNITS.KTS	Knots	Speed	US
UNITS.MPH	Miles per Hour	Speed	US
UNITS.FPS	Feet per Second	Speed	US
UNITS.FPM	Feet per Minute	Speed	US
UNITS.KPH	Kilometers per Hour	Speed	SI
UNITS.MPS	Meters per Second	Speed	SI
UNITS.MPM	Meters per Minute	Speed	SI
UNITS.FEET	Feet	Distance	US
UNITS.MILES	Miles	Distance	US
UNITS.NAUTICLE_MILES	Nautical Miles	Distance	US
UNITS.METERS, UNITS.M	Meters	Distance	SI
UNITS.INHG	Inches of Mercury	Pressure	US
UNITS.MILLIBAR, UNITS.MB	Millibar	Pressure	SI
UNITS.HPA	Hectopascal	Pressure	SI

COLORS

Variable	Color
COLORS.RED	Red
COLORS.GREEN	Green
COLORS.YELLOW	Yellow