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Handling GPS Sensor data

Overview

With OpenTx 2.2 it is possible to have multiple GPS sensors, each with their own set of telemetry values which may have user-assigned names.

Value names are case sensitive and may include some or all of the following:

GPS (latitude and longitude as a lua table containing [lat] and [lng])
GSpd (speed in knots)
GAlt (altitude in meters)
Date (gps date converted to local time as a lua table containing [year] [mon] [day] [hour] [min] [sec])
Hdg (heading in degrees true)

This example demonstrates getting latitude and longitude from a sensor with the default name of 'GPS'

Handling GPS Sensor data

Overview

With OpenTx 2.2 it is possible to have multiple GPS sensors, each with their own set of telemetry values which may have user-assigned names.

Value names are case sensitive and may include some or all of the following:

GPS (latitude and longitude as a lua table containing [lat] and [lng])
GSpd (speed in knots)
GAlt (altitude in meters)
Date (gps date converted to local time as a lua table containing [year] [mon] [day] [hour] [min] [sec])
Hdg (heading in degrees true)

This example demonstrates getting latitude and longitude from a sensor with the default name of 'GPS'

local gpsValue = "unknown"

local function rnd(v,d)
    if d then
     return math.floor((v*10^d)+0.5)/(10^d)
    else
     return math.floor(v+0.5)
    end
end

local function getTelemetryId(name)
    field = getFieldInfo(name)
    if field then
      return field.id
    else
      return -1
    end
end

local function init()
  gpsId = getTelemetryId("GPS")
end

local function background()
  gpsLatLon = getValue(gpsId)
  if (type(gpsLatLon) == "table") then
    gpsValue = rnd(gpsLatLon["lat"],4) .. ", " .. rnd(gpsLatLon["lon"],4)
  else
    gpsValue = "not currently available"
  end
end

local function run(e)
  lcd.clear()
  background() -- update current GPS position
  lcd.drawText(1,1,"OpenTX 2.2 GPS example",0)
  lcd.drawText(1,11,"GPS:", 0)
  lcd.drawText(lcd.getLastPos()+2,11,gpsValue,0)
end

return{init=init,run=run,background=background}