signal detection

[Warulf]

Hi! Im currently working on an ultrassonic sensor using labview. So, i have a timer that starts when i send pulses and i want it to stop, when the receiver module of the sensor detects the ultrasound and transforms it onto a signal. My problem is that i dont know how to build an vi that stops my timer when it detects the signal from the receiver. Im using a data aquisition module for my work.

[GerdW]

Hi Warulf,

which DAQ module do you use? (Which DAQ hardware at all?)

What is the expected time interval?

In general you read in the analog signal of your transformer/receiver with a fixed sample rate. Once you read in the signal you can easily analyze it - as the samples come with a fixed rate/time interval you can use their index to calculate the time…

[Warulf]

im using an NI-622X, cant really tell you the last number since the the daq is on college lab.

[GerdW]

Hi Warulf,

go through all those example VIs coming with LabVIEW and DAQmx. There are example showing how to read in an analog signal with a fixed samplerate.

And there are examples for peak detection…