Simple question about "Sound" command

[fratello]

Hi !
I made one thermostat, with PIC16F628A and LCD display, for using as thermo-regulator. All works fine, but ... I want to have an audible "mark" when temperature is bigger/smaller than setting.
I wrote this :

 If Temperature > Temp_Up then          ' Above Target temperature 
  PORTA.2=0                             ' Deactivate Warm output
  PORTA.3=1                             ' Activate   Cold Output
SOUND PortA.7, [107,50]
 EndIf

But in this way the buzzer sound WHILE Temperature > Temp_Up ... How can be setting to sound just 5 seconds, for example ?
Thanks in advance !

[tasmod]

I'm thinking this must be in a larger loop structure to keep returning to the routine.

How about this as an idea only:

If Temperature > Temp_Up then           ' Above Target temperature
  PORTA.2=0                             ' Deactivate Warm output
  PORTA.3=1                             ' Activate   Cold Output
SOUND PortA.7, [107,50]
temp_up = temp_up +5                     'or 10 or whatever
endif                                    'as long as reset elsewhere

[HenrikOlsson]

You need a flag to remember that you've already sounded the alarm.

AlarmDone VAR BIT

IF Temperature > TempUp THEN
  PortA.2 = 0
  PortA.3 = 1
  IF AlarmDone = 0 THEN          ' Only activate alarm if not already activated.
    SOUND PortA.7, [107, 50]
    AlarmDone = 1                   ' Alarm has been activated.
  ENDIF
ELSE
  AlarmDone = 0                   ' Temperature is not over the limit, rearm the alarm.
ENDIF

[fratello]

Thanks for reply !
The second variant work verry fine. THANK YOU, Mr.Henrik ! As usual, You're a Great Gentleman !