Repeat KeyDown

[PiezaKake]

In the workflow below, I aim every time I press the key determined by KeyDown, the AnalogOutput to play back the signal read with the MatrixReader. The workflow stops running once I press the key and the signal plays back once (SampleMode is set to FiniteSamples). However, I want the workflow to continue running, so that every time I press the key the signal plays back.

[banchan86]

@PiezaKake So you probably want to read the waveform into a subject with memory like BehaviourSubject instead of reading it with every keypress, and then control playback with the keypress instead. Something like this:

And then within the SelectMany I think this should work (don't have hardware with me right now to test it out, not sure if you need to tweak the AnalogOutput settings or can bring it out of the SelectMany):

The reason why the original workflow stops running is once MatrixReader is done reading the file it sends a OnCompleted message that terminates the sequence.

[PiezaKake]

@banchan86 Thanks for this. I tried your recommendation, but now the second time I press the key, I get the error below stemming from AnalogOutput. I guess this error means that AnalogOutput is still reserved for the first KeyDown. Getting AnalogOutput out of SelectMany did not resolve this.

[banchan86]

@PiezaKake are you trying to play the second event before the first event has finished? Alternatively, can you try adding a Take operator after the AirPuff subject and just take the first value? This might ensure the connection terminates and doesn't stay open with each keypress.

If that still doesn't work, upload your bonsai workflow and the matrix file in a zip file and I can try it out.

[PiezaKake]

Thanks, this worked better. So the first time I press the key I get the air puff, the second time nothing happens, the third time I get the air puff, and so on. Basically I get the air puff on odd numbered key presses. Is there a fix to get the air puff with each key press? Take is set to 1, and changing this number returns the previous error.

[banchan86]

@PiezaKake hmm how long is the airpuff supposed to last, what is the time in between when you press the key press, and also is your waveform/matrix formatted in the right way?

I am now also wondering if this might be related to these two issues here:

• DigitalOutput with finite sampling can indefinitely prevent notifications from other observables daqmx#23
• OnCompleted should be called only after WaitUntilDone completes daqmx#27