Analogue output digital output

Hello,
I managed to create my VI in the proper way I think. I am trying to send a ttl every time my analogue output crosses zero. All whats left now is to transform the analogue data into a digital data and input it into the dammx write for the DO line. I would like to trigger on the zero corssing of the waveform and other intervals which I can select. Attached is the VI, I have created. I have trried to use a loop and find the zeros, but I think its simpler than that. I would also like to add the functionality of triggering eery nth zero corssing since the device I am triggering has a lower max freq then my drive signal
Thank you
Ala
Attachments:
AOTTL.vi ‏209 KB

Hi James,
Thank you for that, Attached is screen shot of the TTL and the analogue output. As you can see the TTL are not trigerring at a specefic instance with relation to the AO, and the pulse width varies(although this is not critical as I am triggering on the rising edge). I think the best solution would be to generate another simple waveform (WV2) at the same time of the equation waveform with the same frequency (low). Then use that signal to generate the trigger at zero crossing (WV2 labelleb in vi). Then to vary the phase with relation to the AO signal shift the simple waveform by a known phase and still trigger at zero crossing. Attached is the trigger illistration and a VI that shows the generation of the other waveform used for triggering. I have been trying to do this but to no avail.
Thank you
Ala
Attachments:
AOTTL.vi ‏241 KB
Trigger illustration.jpg ‏145 KB

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