Basic Programming Help

Jason Gulbinas

hello:

· I am new to Basic programming and·am currently geting through both·"What's a Microcontroller" and "Applied Sensors" ... both very helpful.· I am wondering what the logic would be behind a very simple program I am working on.· The program would take the current temperature (I know this part of the program) and would make a beep with the transducer once a temperature is passed though (I know this part too).· The problem I am having is that once the "target temperature" is passed I want the program to enter a new area where it will not keep beeping if the temperature is fluctuating ariund the target.·

So:

- Once target temperature is hit (Something like IF Temp (Variable) > 21 THEN...make a beep (FREQUOUT)

BUT once that is done don't do it again until the program is restarted totally.· Therefore, if the Tepm variates around 21, say, I don't want it to keep beeping.· Once it gets there and keeps rising it is okay if the sensor goes down and up a few times but I don't want the command to be initiated again.

I guess I might be able to accomplish this with a Subroutine that is entered after the "Target temp" is reached and cannot get out of since it is on it's own DO...LOOP routine?

Or perhaps make an index where the index can only reach 1 and it does not happen again?

Any help would be appreciated!· Thanks in advance!

Newzed

You could try something like this:

if temp =< target temp + 1·or temp=> target temp -1 then
frequout pin, 0
endif

It's difficult to help without your complete program.

Sid

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Yesterday is history, tomorrow is a mystery, and today is a gift.

That is why they call it the present.

Don't have VGA?
Newzed@aol.com
·

Mike Green

You've got the basic idea. Your main program has two sections, call them "startup" and "maintain". "startup" is first and "maintain" is second. You can use a DO ... LOOP for each section or a label at the beginning of each section (say "startup:" and "maintain:") and GOTOs within the sections (or both conventions). I wouldn't call these subroutines. Reserve that term for routines called with a GOSUB and ending with a RETURN.

' initialization code
startup:
GOSUB takeTemp
IF temp < limit then
  GOSUB increase
  GOTO startup
ENDIF
' do beep
maintain:
GOSUB takeTemp
IF temp < limit THEN
  GOSUB increase
  GOTO maintain
IF temp > limit THEN
  GOSUB decrease
  GOTO maintain
ENDIF
GOTO maintain
takeTemp:
' do stuff
RETURN
increase:
' do stuff
RETURN
decrease:
' do stuff
RETURN

Newzed

Had to edit my post.

Sid

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Yesterday is history, tomorrow is a mystery, and today is a gift.

That is why they call it the present.

Don't have VGA?
Newzed@aol.com
·

Tracy Allen

I like to use a flag for this purpose. Flag=0 to start.

IF Temp (Variable) > 21 AND flag=0 THEN
' make a beep (FREQUOUT)
flag = 1
ENDIF

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Tracy Allen
www.emesystems.com

Jason Gulbinas

Okay! These are great solutions...I will put them to work and see which works best for my application...which is still developing. Thanks so much all of you for your input.