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Tick Count behavior
March 17, 2015
5:46 pm
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Ashtar
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March 12, 2015
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I have a VI that uses the output of the Tick Count VI as part of my logic. I kept getting an intermittent error in logic and narrowed down to what it seems to be an erroneous behavior of the Tick Count VI that sometimes unexpectedly outputs zero. Is there a reported bug on that primitive?

March 17, 2015
9:26 pm
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filipealtoe
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March 12, 2015
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Hi Ashtar;

Nice job narrowing down the issue. Can you give me more specifics of when you see the error occur?

Cheers Filipe
March 17, 2015
9:31 pm
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Ashtar
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It seems that every time I disconnect my Arduino from the USB port, the first time it runs, I see the erroneous behavior.

March 17, 2015
9:52 pm
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filipealtoe
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Ah, ok. In fact, what you are seeing is actually expected behavior. The Arduino targets don’t have an internal RTC (real time clock). What that means is that, every time the Arduino is power cycled (by disconnecting it from the USB port) the internal tick count maintained by its internal counter is zero’d. That is why the first time you run the program after it was disconnected from the USB you see the output of the Tick Count return zero. To avoid this from happening, you will need to prevent the Arduino from power cycling; by either connecting an external power supply or battery pack to it if you need to constantly disconnect it from your USB port.

Cheers Filipe
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