Clreol?

Keith Hilton

·I am in class at OTC right now, trying Jon Williams suggestion of the following program on a BS-2 and it is telling me CLREOL is a undefined symbol, it also told me hertz was a undefined variable.· I made herts VAR word above the program.· Can't find the term CLREOL in my Basic Stamp Manual.
Sorry, the teacher is gone to Florida and I need help.
Here is what Jon sugested:
Main: Count 0, 1000 hertz
DEBUG, HOME, DEC hertz,CLREOL
GOTO Main

Post Edited By Moderator (Jon Williams) : 12/10/2004 5:55:47 PM GMT

Jon Williams

Make sure you're using the PBASIC 2.5 declaration in your program:

' {$STAMP BS2}
' {$PBASIC 2.5}

You can find CLREOL in the help file which is newer than the manual -- make sure you have the latest version of the BASIC Stamp editor (you can download it from our web site).

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Jon Williams
Applications Engineer, Parallax
Dallas Office

Keith Hilton

Thanks Jon. Here is my program:
'{$STAMP BS2}
'{$PBASIC 2.5}
hertz VAR word
Main: COUNT 0,1000, hertz
DEBUG HOME,DEC hertz, CLREOL
GOTO Main
I am feeding in a signal from a function generator--sign wave set at 1K hertz.
The 1K hertz signal is sent to a LM324, then to a 74HC14, then to BS2. The DEBUG screen is reading 3000 hertz. Jon, why isn't the DEBUG screen reading 1K hertz?

allanlane5

It should be reading 1000. Possible bugs:

1. You don't have a common ground.

2. You have 'ringing' on the line.

3. Your sine wave is not zero-referenced.

4. Why send the 1 KHZ signal to an LM324 op amp? For buffering?

5. What does your function generator expect its signal to be terminated by. Typical value 50 ohms.

Jon Williams

If you're using a BS2 (not a BS2sx or BS2p), then the problem must be with your hardware -- I ran your code on an NX-1000 and got correct results from the pulse generator. You should look at the signal (on pin 0)·with a scope to see what's going on.

You can add this to the top of your program to make it work the same with any BASIC Stamp 2 module:

#SELECT $STAMP
  #CASE BS2, BS2E
    DurAdj      CON     $100            ' / 1
  #CASE BS2SX
    DurAdj      CON     $280            ' / 0.400
  #CASE BS2P
    OneSec      CON     $37B            ' / 0.287
  #CASE BS2PE
    OneSec      CON     $163            ' / 0.720
#ENDSELECT

Capture         CON     1000            ' 1 second

Then you would adjust your COUNT line like this:

  COUNT 0, (Capture */ DurAdj), hertz

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Jon Williams
Applications Engineer, Parallax
Dallas Office

Post Edited (Jon Williams) : 12/10/2004 6:30:31 PM GMT

Keith Hilton

Jon, miricles happen all the time! Here is what I did and the program is running perfect for me now.
'{$STAMP BS2}
'{$PBASIC 2.5}
hertz VAR word
Main: COUNT 0,1000,hertz
DEBUG HOME, DEC hertz /2, CLREOL
GOTO Main
Don't why it works but it works? I am now going to put the LCD in the program.
Then when I go home ,I am going to hook up my guitar to the same place I hooked up the signal generator. By the way allanlane5, thanks for trying to help. I don't need the LM324 with the signal generator--you are right about this, but I will need it with my guitar, because the signal from a magnetic pickup is weak. Jon wonder why this works?

Jon Williams

Danger Will Robinson!

You really should know why it works before proceeding -- you may be bitten by your ignorance later. Connect a 'scope to see what you're actually getting into the BASIC Stamp for the COUNT function.

Also, can you post your schematic for others to consider?

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Jon Williams
Applications Engineer, Parallax
Dallas Office

Keith Hilton

Got the LCD working also, here is the program add in: SEROUT 8, 16468, {254,1]
SEROUT 8, 16468, [noparse][[/noparse]DEC hertz /2, "HZ"]
GOTO main
Now if I can get get my guitar to work and read out hertz on a picked string, so I can tune to the hertz I want. Got to thinking I was stupid for a while, maybe there is some hope for me Jon.

Keith Hilton

Jon, I suspect the problem is in my hookup arrangement of the LM324.· I looked at the output of the LM324·on the 0-scope before the signal got to the schmitt trigger.· It did not look even like it should, it looked doubled up.· This may be why I am getting 2 times the signal.· I will have to check the data sheets on the LM324, maybe the function generator is driving it to hard.

Jon Williams

What I believe may be happening is that your LM324 circuit is acting like a full-wave rectifier, so you're getting both halves of the sine cycle, effectively doubling your frequency. This could prove useful -- IF you know that this is a constant behavior. If your input is actually twice the source frequency, you can update your LCD at twice the rate:

COUNT 0, 500, hertz

Since your input frequency (to the BASIC Stamp) has been doubled, you only have to sample for half the time.

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Jon Williams
Applications Engineer, Parallax
Dallas Office