detect fall of analog input signal

[Reja]

How can I detect fall of my 0-5V TTL signal that I have connected to one of the analog inputs? I want the labview code to give me true if there is fall and 0 elsewise.

[Kenny_K]

Try using the Amplitude and Levels VI under signal processing > Wfm Measurement.  It will measure the amplitude and the it can give you the high level state and the low level state (max and min).

You can then wire the amplitude to a case structure, if it is 5V, then output a 0, if it is less, it will output a 1.

Kenny

[tbob]

Am I correct in assuming that you want to monitor the incoming analog signal and set a flag when the signal goes from 5v to 0v?

If so then use the following code:

Message Edited by tbob on 02-08-2006 04:41 PM