Count 4th consecutive pulses from the analog output of the encoder

Hi
Iam getting analog output from the encoder and i want to count the 4th peak of the analog signal. Kindly suggest the best method Once 4th pulse is detected counter will increments.
Pl refer the encoder output .
Thanks
Attachments:
encoder sig.JPG ‏26 KB

Whatever you've counted using your logic, divide it by 4 and convert it to an integer (towards negative infinity)..!!
This should work.
I am not allergic to Kudos, in fact I love Kudos.
Make your LabVIEW experience more CONVENIENT.

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When using the analog inputs and analog outputs of the PCI-7344, what is the conversion between the voltage entering the card to counts? Similarly, what is the conversion between counts to voltage at the output of the card?

I am using the PCI-7344 to control my system. The analog inputs are connected to the output of my system while the analog outputs serve as feedback to the system. The system is a servo. I want to know what is the conversion between the voltage read at the input, to card counts, and finally to the voltage output to the system.

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If you are trying to do analog feedback with a servo motor, Chapter 14 of the manual talks about how to set up the torque feedback. Also linked below is a LabVIEW example of analog feedback.
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PCI Card for Analog output in the range of 10mv

dear ni,
                I want to know about the PCI card that can be generate analog output in the range of maximum 10mv. i am going to use for caliberation of loadcell, strain gauges devices.
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Try: http://www.ni.com/dataacquisition/
These have analog output voltages < 10V:   http://sine.ni.com/nifn/cds/view/main/p/sn/n12:7604,n3:7853/lang/en/nid/1036/ap/daq
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Message Edited by vt92 on 11-18-2009 07:56 AM
"There is a God shaped vacuum in the heart of every man which cannot be filled by any created thing, but only by God, the Creator, made known through Jesus." - Blaise Pascal

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Hi,
I need to use the analog output channel on a NI PCIe-6351 to play an audio signal, and while the signal plays i need make some changes the UI dialog box, is it possible for me to move the playing of the audio to the background and proceed with program execution?
Here is a simple piece of code that explains what I'm trying to do:
#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#include<math.h>
#include<string.h>
#include<memory.h>
#include<wchar.h>
#include "sndfile.h" //include file for the sound library
#include "NIDAQmx.h"
#define DAQmxErrChk(functionCall) { if( DAQmxFailed(error=(functionCall)) ) { goto Error; } }
float *fWavSample;
SNDFILE *SoundFile;
SF_INFO SoundFileInfo;
int iNoOfSamples=0;
int32 error=0;
TaskHandle AOtaskHandle = 0;
float64* AIOSample;
char errBuff[2048]={'\0'};
int32 fnCreateTask(TaskHandle *AOTaskHandle)
int32 error=0;
DAQmxErrChk(DAQmxCreateTask("", AOTaskHandle));
Error:
return error;
int ReadWavFile()
//Open the wav file for reading
SoundFile=sf_open("sin_10s.wav",SFM_READ,&SoundFileInfo);
//Check if file is opened sucessfully
if (SoundFile == NULL)
puts("File not opened");
return FALSE;
//allocate memory for the buffer that is to hold the wav data&colon;
fWavSample = new float[SoundFileInfo.channels * SoundFileInfo.frames];
iNoOfSamples = SoundFileInfo.channels * SoundFileInfo.frames;
//Read data into the float structure that has been copied in
sf_readf_float(SoundFile, fWavSample, SoundFileInfo.frames);
//Allocate memory for the structure that is to hold the sound samples
AIOSample = new float64[iNoOfSamples+660];
//Copy wavefile data into the new float64 array (needs to be typecasted to float64)
int i=0;
for(i=0;i<(SoundFileInfo.channels * SoundFileInfo.frames);i++)
AIOSample[i] = (float64)fWavSample[i];
//After the float64 array has been filled, release the memory used by fWavSample
free(fWavSample);
return 0;
int main(int argc, char** argv)
DAQmxErrChk(fnCreateTask(&AOtaskHandle));
//Create an analog out channel
DAQmxErrChk (DAQmxCreateAOVoltageChan(*(&AOtaskHandle),"Dev1/ao1","",-10.0000000,+10.00000,DAQmx_Val_Volts,NULL));
//16 bit output resolution needed, sampling rate matched to the WAV file's
DAQmxErrChk (DAQmxCfgSampClkTiming(AOtaskHandle,"",44100.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,1000));
//Set the output to trigger on a rising edge on PFI6
//DAQmxErrChk (DAQmxCfgDigEdgeStartTrig (AOtaskHandle,"PFI6",DAQmx_Val_Rising));
//Start the task in the background
DAQmxStartTask(AOtaskHandle);
ReadWavFile();
DAQmxErrChk(DAQmxWriteAnalogF64(AOtaskHandle,(SoundFileInfo.channels * SoundFileInfo.frames),true,10.0, DAQmx_Val_GroupByChannel,AIOSample,NULL,NULL));
printf("Playing audio\n");
Error:
if( DAQmxFailed(error) )
DAQmxGetExtendedErrorInfo(errBuff,2048);
//puts(errBuff);
puts(errBuff);
return TRUE;//DefWindowProc(hwndmon,message,wParam,lParam);
getch();
The program reads a 10 seconds long 1kHz sine wave signal from a WAV file and plays it over AO0.
I want the program to print "Playing Audio" on the console window while the audio is still playing, i.e when DAQmxWriteAnalogF64 is executing.
I'm using Visual Studio 2005 on Windows XP and an NI PCIe6351.
I'd really appreciate any help I can get.
Thanks a lot!
RaziM

Hi RaziM,
It sounds like you will need to implement some sort of multithreading to accomplish playing audio in the background and also making changes in the UI dialog box in the foreground. Since DAQmx is thread safe this should definitely be possible, but it will probably take a little more work on your part.
You may want to take a look at this page which gives a walkthrough to Multithreading with a Background component, http://msdn.microsoft.com/en-us/library/ywkkz4s1.aspx
Here is another forum post about how DAQmx runs multiple threads, http://forums.ni.com/t5/Measurement-Studio-for-VC/DAQmx-how-does-it-multithread/td-p/221953
I hope some of this helps!
Rachel M.
Applications Engineer
National Instruments

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TYPE-POOLS : SLIS.
DATA : IT_SCARR TYPE TABLE OF SCARR,
       IT_FCAT TYPE SLIS_T_FIELDCAT_ALV.
SELECT *
FROM SCARR
INTO TABLE IT_SCARR.
CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'
EXPORTING
*   I_PROGRAM_NAME               =
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*   I_CLIENT_NEVER_DISPLAY       = 'X'
*   I_INCLNAME                   =
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*   I_BUFFER_ACTIVE              =
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* EXCEPTIONS
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ENDIF.
CALL FUNCTION 'REUSE_ALV_LIST_DISPLAY'
EXPORTING
*   I_INTERFACE_CHECK              = ' '
*   I_BYPASSING_BUFFER             =
*   I_BUFFER_ACTIVE                = ' '
*   I_CALLBACK_PROGRAM             = ' '
*   I_CALLBACK_PF_STATUS_SET       = ' '
*   I_CALLBACK_USER_COMMAND        = ' '
*   I_STRUCTURE_NAME               =
*   IS_LAYOUT                      =
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*   IT_EXCLUDING                   =
*   IT_SPECIAL_GROUPS              =
*   IT_SORT                        =
*   IT_FILTER                      =
*   IS_SEL_HIDE                    =
*   I_DEFAULT                      = 'X'
*   I_SAVE                         = ' '
*   IS_VARIANT                     =
*   IT_EVENTS                      =
*   IT_EVENT_EXIT                  =
*   IS_PRINT                       =
*   IS_REPREP_ID                   =
*   I_SCREEN_START_COLUMN          = 0
*   I_SCREEN_START_LINE            = 0
*   I_SCREEN_END_COLUMN            = 0
*   I_SCREEN_END_LINE              = 0
*   IR_SALV_LIST_ADAPTER           =
*   IT_EXCEPT_QINFO                =
*   I_SUPPRESS_EMPTY_DATA          = ABAP_FALSE
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*   E_EXIT_CAUSED_BY_CALLER        =
*   ES_EXIT_CAUSED_BY_USER         =
TABLES
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* EXCEPTIONS
*   PROGRAM_ERROR                  = 1
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*    BIN_FILESIZE              =
    FILENAME                  = 'C:\Documents and Settings\sap\Desktop\Hi.xls' " Change path
*    FILETYPE                  = 'ASC'
*    APPEND                    = SPACE
*    WRITE_FIELD_SEPARATOR     = SPACE
*    HEADER                    = '00'
*    TRUNC_TRAILING_BLANKS     = SPACE
*    WRITE_LF                  = 'X'
*    COL_SELECT                = SPACE
*    COL_SELECT_MASK           = SPACE
*    DAT_MODE                  = SPACE
*    CONFIRM_OVERWRITE         = SPACE
*    NO_AUTH_CHECK             = SPACE
*    CODEPAGE                  = SPACE
*    IGNORE_CERR               = ABAP_TRUE
*    REPLACEMENT               = '#'
*    WRITE_BOM                 = SPACE
*    TRUNC_TRAILING_BLANKS_EOL = 'X'
* IMPORTING
*    FILELENGTH                =
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* EXCEPTIONS
*    FILE_WRITE_ERROR          = 1
*    NO_BATCH                  = 2
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*    ACCESS_DENIED             = 15
*    DP_OUT_OF_MEMORY          = 16
*    DISK_FULL                 = 17
*    DP_TIMEOUT                = 18
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* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*            WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
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*    APPLICATION            =
*    PARAMETER              =
*    DEFAULT_DIRECTORY      =
*    MAXIMIZED              =
*    MINIMIZED              =
*    SYNCHRONOUS            =
*    OPERATION              = 'OPEN'
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*    CNTL_ERROR             = 1
*    ERROR_NO_GUI           = 2
*    BAD_PARAMETER          = 3
*    FILE_NOT_FOUND         = 4
*    PATH_NOT_FOUND         = 5
*    FILE_EXTENSION_UNKNOWN = 6
*    ERROR_EXECUTE_FAILED   = 7
*    SYNCHRONOUS_FAILED     = 8
*    NOT_SUPPORTED_BY_GUI   = 9
*    others                 = 10
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* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
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I lost my ac adapter for my Camelio X100 camera. I want to know the AC output for the orignal adapter because I need to buy a new one.
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Hi,
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CELL_07(80) TYPE C,
CELL_08(80) TYPE C,
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tables
data = IT_EXCEL
exceptions
unknown_error = 1
others = 2.
if sy-subrc <> 0.
message e001(ymm) with 'Error in exporting to Excel.'.
endif.
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*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
When you click the button - Export to Excel ( GUI-Status) you'll be able to export the content of the Internal Table to an Excel file .......
Regards,
Abir
Don't forget to award Points *

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Count 4th consecutive pulses from the analog output of the encoder

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