OBJ

  pst   : "parallax serial terminal"
  alt   : "29124_altimeter"

CON

  _clkmode      = xtal1 + pll16x  
  _xinfreq      = 5_000_000       

  START_ALT     = 1317             ' Your starting altitude in feet. You can get this from a local airport

PUB start | a, p, t

  pst.start(38400)                                       ' Start Parallax serial terminal.
  alt.start(alt#QUICKSTART, alt#BACKGROUND)              ' Start altimeter for QuickStart with background processing.
  alt.set_resolution(alt#HIGHEST)                        ' Set to highest resolution.
  alt.set_altitude(alt.m_from_ft(START_ALT * 100))       ' Set the starting altitude, based on average local pressure.                  
  repeat
    a := alt.altitude(alt.average_press)                 ' Get the current altitude in cm, from new average local pressure.
    pst.str(string(pst#HM, "Altitude:"))                 ' Print header.   HM = home
    pst.str(alt.formatn(a, alt#METERS | alt#CECR, 8))    ' Print altitude in meters, clear-to-end, and CR.
    pst.str(alt.formatn(a, alt#TO_FEET | alt#CECR, 18))  ' Print altitude in feet, clear-to-end, and CR.
    
    p := alt.current_press
    pst.str(string("Barometric Pressure:"))
    pst.str(alt.formatn(p, alt#MILLIBARS | alt#CECR, 8))
    pst.str(alt.formatn(p, alt#TO_INCHES | alt#CECR, 27))
    
    t := alt.current_temp
    pst.str(string("Temperature:"))
    pst.str(alt.formatn(t, alt#DEGC | alt#CECR, 8))
    pst.str(alt.formatn(t, alt#TO_DEGF | alt#CECR, 20))
    
    if (pst.rxcount)                                     ' Respond to any key by clearing screen.
      pst.rxflush
      pst.char(pst#CS)