Timer

[MartinkoKlucar]

This weekend I must submit homework. But I don't know how to do it. Could you help me please ? 

Here is the task.

Create a VI to measure the obstacle course time. The obstacle course has a beginning and an end at the same place and is equipped with an optical wound with a photoresist. The name of the current competitor is written on the front panel. The timekeeping is triggered and stopped by interrupting the light flow through the optical gate. At the end of the run, the time in seconds, along with the rider's name, is added to the previous record of the text file "result.txt" in name-time format. After pressing the button on the front panel, the name of the competitor with the best time is displayed.

[GerdW · Accepted solution]

Hi Martinko,

This weekend I must submit homework. But I don't know how to do it. Could you help me please ?

Some simple steps:

Learn the LabVIEW basics.

Examine the example VIs coming with LabVIEW.

Develop an algorithm - on a sheet of paper!

Then start to code your homework.

You still have 3 days to complete, so hurry up!

General advice: when you have specific question you need to ask in a specific way. We will not do your homework!

[MartinkoKlucar]

You're right, I have some algorithm in my head, but I don't know how to start and stop time with a pulse.

[GerdW]

Hi Martinko,

how to start and stop time with a pulse.

Are you about a time machine? 😄

You surely want to measure the time between two pulses: you need a DAQ device, you need to read your "pulse" signal, find the pulses, and determine the time between them. What have you tried so far?

[MartinkoKlucar]

You're right, I have some algorithm in my head, but I don't know how to start and stop time with a pulse. I want to do it by shift register... I will count how many times the loop repeated and than I multiply it with time delay. But how I mentioned I don't know how start counting loops when the first pulse comes and end it with the second pulse.

[MartinkoKlucar]

I tried to do it with some basic .... like if ... :DDD but ... its not good. But I will trie to measure duration between pulse...

[GerdW]

Hi Martinko,

I don't know how start counting loops when the first pulse comes and end it with the second pulse.

Each loop has a loop iterator: read it whenever you detect a pulse and store it in a shift register until there is a 2nd pulse…

Using shift registers and loop iterators are pretty basic stuff, so back to item 1 of my list above!

[MartinkoKlucar]

But how I Can find out which is first "rising edge" and how when its the second "rising edge" the it stops from one channel ?

[GerdW]

Hi Martinko,

you could count them - and keep the counter in a shift register…

[MartinkoKlucar]

Thanks... 

I had a lot of attempts but none worked (I feel so dump)... please could you show me the detection of pulse and measure time ? The other I think I can make it ,but I can't move without it..... 

Thanks for answer 🙂