1v-5v output linearly by using 5v supply, voltage divider and variable resister

How can i get 1v-5v output linearly by using 5v supply, voltage divider and variable resister ?
"SB02"
Solved!
Go to Solution.

Do you have it wired like the attached file? Using my schematic, you can calculate the current through the pot based on the desired voltage drop across the pot
4V / 10Kohm = 0.0004 A
From Kirchhoff's current law, we know the same current will flow through the circuit so now we can calculate the lower leg of the divider based on the current and the desired voltage drop across the resistor
1V / 0.0004 A = 2.5K Ohm
My schematic keeps the current through the circuit constant so the voltage divider should never change. Assuming a linear pot, you will get a linear voltage swing as measured at the wiper. If you wired the pot a different way, then more then likely, you are changing the total resistance from 5V to ground which would effect the current which would effect the voltages.
Attachments:
divider.JPG ‏48 KB

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MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
CALL METHOD cl_gui_frontend_services=>file_save_dialog
EXPORTING
   WINDOW_TITLE         =
   DEFAULT_EXTENSION    =
   DEFAULT_FILE_NAME    =
   FILE_FILTER          =
   INITIAL_DIRECTORY    =
   WITH_ENCODING        =
   PROMPT_ON_OVERWRITE = 'X'
CHANGING
    filename             = FILE_NAME
    path                 = FILE_PATH
    fullpath             = FULL_PATH
   USER_ACTION          =
   FILE_ENCODING        =
EXCEPTIONS
   CNTL_ERROR           = 1
   ERROR_NO_GUI         = 2
   NOT_SUPPORTED_BY_GUI = 3
   others               = 4
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
           WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
*******************DOWNLOADING THE PDF DATA******************************
CALL FUNCTION 'GUI_DOWNLOAD'
EXPORTING
   BIN_FILESIZE                    = binfilesize
   FILENAME                          = FULL_PATH
   FILETYPE                           = 'BIN'
APPEND                             = ' '
WRITE_FIELD_SEPARATOR           = ' '
HEADER                          = '00'
TRUNC_TRAILING_BLANKS           = ' '
WRITE_LF                        = 'X'
COL_SELECT                      = ' '
COL_SELECT_MASK                 = ' '
DAT_MODE                        = ' '
CONFIRM_OVERWRITE               = ' '
NO_AUTH_CHECK                   = ' '
CODEPAGE                        = ' '
IGNORE_CERR                     = ABAP_TRUE
REPLACEMENT                     = '#'
WRITE_BOM                       = ' '
TRUNC_TRAILING_BLANKS_EOL       = 'X'
WK1_N_FORMAT                    = ' '
WK1_N_SIZE                      = ' '
WK1_T_FORMAT                    = ' '
WK1_T_SIZE                      = ' '
IMPORTING
FILELENGTH                      =
tables
    data_tab                        = PDFTAB[]
FIELDNAMES                      =
EXCEPTIONS
   FILE_WRITE_ERROR                = 1
   NO_BATCH                        = 2
   GUI_REFUSE_FILETRANSFER         = 3
   INVALID_TYPE                    = 4
   NO_AUTHORITY                    = 5
   UNKNOWN_ERROR                   = 6
   HEADER_NOT_ALLOWED              = 7
   SEPARATOR_NOT_ALLOWED           = 8
   FILESIZE_NOT_ALLOWED            = 9
   HEADER_TOO_LONG                 = 10
   DP_ERROR_CREATE                 = 11
   DP_ERROR_SEND                   = 12
   DP_ERROR_WRITE                  = 13
   UNKNOWN_DP_ERROR                = 14
   ACCESS_DENIED                   = 15
   DP_OUT_OF_MEMORY                = 16
   DISK_FULL                       = 17
   DP_TIMEOUT                      = 18
   FILE_NOT_FOUND                  = 19
   DATAPROVIDER_EXCEPTION          = 20
   CONTROL_FLUSH_ERROR             = 21
   OTHERS                          = 22
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
After executing this program, it will ask for saving in the desktop. Give proper location and the PDF file will be stored in that location.
<b>Award points if found useful.</b>
Regards,
SP.

Is anyone successfully outputting 8 channels using ETT/Insert ?

I've been trying to do an 8 channel output, but can't get it to work.
If I choose 8 channel audio mapping in the Device Control preset, with RS222 control, then in my ETT window the destination track control popup for the audio tracks shows channel 4 as already enabled but its greyed out and can't be modified.
Then, regardless of ouput channel selection, FCP's device control seems unable to control channels 5 to 8 on the recorder.
In FCP, if I select any output channels above channel 4, then all channel selections below 4 are ignored, and the recorder receives a signal to enable channels 1 to 4 relative to my selections in FCP for channels 5-8.
Any tips greatly appreciated.
Cheers
Andy

we're using a Decklink Extreme card and sending to a Sony IMX vtr (msw-2100)
... but i'm not sure this has anything to do with the deck or the card as the problem seems to originate within FCP. as i mentioned, you just have to select 8 channel audio mapping to see the problem - as soon as you do that your destination audio controls in the ETT window get srewed up (can't un-map channel 4) and if we manually override the channel selection on the deck we can see and monitor the output channels and they are all ok.
heaven forbid, but it seems to be a bug.

Can a Didital output task be used to read a line

I have a digital output task, but I would like to be able to read the value of the line as well (to save me having to store the last value I wrote to it). I have tried, and it appears to work fine, but I can't find any hint that it is supported in the documentation. Intuitively I might expect that it would work.
Is it a legal operation (will it ever stop working in a future release!)?
Am I reading the actual value on the physical line, or some internally buffered version of the value I wrote?
My DO task is using programmed IO, on demand modes - and I am using DAQmxWriteDigitalScalarU32 to write values, and DAQmxReadDigitalScalarU32 to read them. These are some of the DO properties
**Task: Write Laser On
Task - Name: LASER
Task - Channels: Vestibular/port0/line31
Timing - Sample Mode: 10123 DAQmx_Val_ContSamps
Timing - Sample Timing Type: 10390 DAQmx_Val_OnDemand
Write - Wait Mode: 12547 DAQmx_Val_Sleep
Write - Sleep Time: 0.0010
Buffer - Output Buffer Size: 0
Channel - Output Data Transfer Mechanism: 10264 DAQmx_Val_ProgrammedIO
Thanks,
Paul

Hi Paul,
This is a legal operation on the NI-DAQMX, you can read the digital port lines current state and as far as I'm aware it's not expected to change in future releases. You are reading the actual current state of the line, I hope this answers your question.
Thanks,
Rob W
National Instruments
Application Engineer
Message Edited by rsw on 11-16-2007 03:48 AM
Message Edited by rsw on 11-16-2007 03:48 AM
Applications Engineer

Output type is used for sending / printing "schedule lines" against sch agr

hi
which output type is used for sending / printing "schedule lines" against sch agreement
LPET or LPH1?
sara

Hi Sara,
It is LPET.
Thanks & Regards,
Kiran

1v-5v output linearly by using 5v supply, voltage divider and variable resister

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