please help in VB6.0

Thread Starter

eng.zaid

Joined Dec 6, 2007
10
Hi,
I need to know how to plot graphs in VB for a data collected from a parallel port as function of time for device measuring a variable quantity like temperature or flow or voltage etc.....) versus time.

Please i am depending on you.

Thank
 

CVMichael

Joined Aug 3, 2007
419
Did you figure out how to read the data from the port ?

I myself never tried to read data from parallel port, but I did manage to output data. You cannot do it VB6 alone (depending on what windows you have), you need a DLL to be able to read/write to the port.

Also, at what frequency does the data come in ?

I am asking that because if it's comming too fast, then I don't see how you are able to read with VB6 because I don't think VB6 can get an event when data is ready to read. You will have to have an infinite loop to monitor the port for any changes.

Right now you should focus to figure out how to read the data, plotting to a graph is the easy part.
 

Thread Starter

eng.zaid

Joined Dec 6, 2007
10
Hi


First i want to thank yo for reply,second the frequency is small under it is 5 Hz and i know how to get data from parallel port on widows xp using vb 6.0, but as variable vlue ,but i need to plot this variable value with time as a function to show the waveforme of this signal (i.e I want to see the signal as i see it on oscilloscope).
 

CVMichael

Joined Aug 3, 2007
419
Hi eng.zaid,

Well, first thing you need when plotting is to know the lowest value and highest value that you will ever receive.

After that it is just a matter of drawing a line from last position to current position on the graph.

I know you told me that the frequency is 5Hz, but is that constant ? or does it change in time ?

Do you think you can post the VB6 project here so then it will be easier for me to add the code for the graph ?

Also, please don't make a new thread, post a reply in the same thread, this one....

Admin should merge the other thread with this thread...
 

Dave

Joined Nov 17, 2003
6,970
Admin should merge the other thread with this thread...
As requested.

eng.zaid, please do not create multiple threads for the same query, it makes it difficult to keep track of and lees likely for people to respond to your query. Thanks.

Dave
 
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