How to count every 100 TTL pulses and send 1 pulse out continuously.

[Wen Lin]

Hi,

I was trying to count every 100 pulses to send an pulse out back to caller using Task.CIChannels.CreateCountEdgesChannel().

It's like a divider to take a TTL pulses and divided by 100 and send an pulse out. Is there any simple way to do it?

Thanks

Wen

[Jennifer O]

Hi Wen,

You can do this using a counter output task.  You will want to set the counter to output continuously.  You can route the TTL signal to a PFI line and then set the output task to output a pulse based upon ticks.  For example, you could set the task to be idle low and have 98 ticks low and 2 ticks high (total of 100 TTL ticks). 

Here is a picture of how this would be done in LabVIEW:

The equivalent C function calls would be:

DAQmxCreateCOPulseChanTicks
DAQmxCfgImplicitTiming
DAQmxStartTask
DAQmxGetTaskComplete
DAQmxClearTask

In .Net you will want to look at the CODataTicks Structure.

Regards,

Jennifer O.
Applications Engineer
National Instruments

Message Edited by Jennifer O on 12-14-2006 04:10 PM