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read ttl with NI9205can

Hello,

 

I would like to read a TTL signal using a NI9205 ADC.I've tried different way but no success.

I'm looking for tracks.

 

Thank you

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Message 1 of 8
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Hi gustutu,

 

your 9205 module is able to read voltage signals, so you just read your TTL signal as voltage.

 

You should get values of <0.8V (LOW) and >2.4V (HIGH). To get boolean values you just compare your voltage signal with a threshold value of 2.0V…

Best regards,
GerdW


using LV2016/2019/2021 on Win10/11+cRIO
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Message 2 of 8
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Ok but at the end i have a loop with a value wich is 0 or 1 but i have to detect the frequency of the signal.

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Message 3 of 8
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Hi gustutu,

 

but at the end i have a loop with a value wich is 0 or 1 but i have to detect the frequency of the signal.

Don't know what kind of loop you have and why you only have one (1) value of TRUE/FALSE.

Source code (aka an attached VI) would be helpful here…

 

You should read more samples with a higher samplerate - obey Nyquist when you want to determine frequencies!

Best regards,
GerdW


using LV2016/2019/2021 on Win10/11+cRIO
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Message 4 of 8
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Message 5 of 8
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Hi gustutu,

 

so you read "one channel, one sample" and expect to determine frequencies from just one sample?

 

LabVIEW comes with alot of example VIs, just study them!

Best regards,
GerdW


using LV2016/2019/2021 on Win10/11+cRIO
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Message 6 of 8
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i 'v already tried with this multisample but this ****** vi stop the programm if the signal is 0

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Message 7 of 8
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Hi gustutu,

 

what have you tried?

What is a 6-star VI?

Why should it stop when the signal is 0?

Best regards,
GerdW


using LV2016/2019/2021 on Win10/11+cRIO
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Message 8 of 8
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