BalloonMonitor_PIC
(On PIC  receiving messages from BalloonMonitor)

Initialize Pins & Timer0, Interrupts, Receive Enable

MainLoop
    if Timer0 flag set, goto Timer0_set
    else goto MainLoop
End

Timer0_set
    Clear Timer 0 flag
    If RC0 is high, Pull it down, i.e goto Pull_Line_Down
    else goto Pull_Line_Up
End

Pull_Line_Down
    pull Timer output line  low
    Reset counter to 0
    Form startbyte
    Goto MainLoop
End


Pull_Line_Up 
   pull Timer output line high
End

Interrupt Routine
    Read receive register and store in RECEIVED_MSG
    Increment Counter
    if counter reached 8 goto Chk_Msg
    else keep Xoring, ie goto Xoring
End

Chk_Msg    
if Xored values equal 0 goto CheckSum_Matched
End

Xoring   
Keep xoring bytes received
End

CheckSum_Matched    
if Checksum value received corresponded with the one that should be received when balloon is popped    
goto BalloonPopped
End

BalloonPopped
    Pull Balloon monitor popped indication line high
    Disable interrupts
End