how to make while loop stop when i set while loop at a fixed time.

[tangliang]

i don't know how to make while loop stop at a fixed time. Usually. while loop stops when we enter stop button or mistakes have been made. now i wanna while loop stop at a fixed time, 20ms,40ms,and so on. how can i realise that. thank u!

[johnsold · Accepted solution]

Use the Tick Count function. Get the current tick count when you start the loop.  Add your time (20 ms) to the start value creating a "stop time." On each iteration read Tick Count again and compare the current value to the "stop time" value.  If greater, then stop, otherwise continue.

Note that on a desktop operating system you will see some jitter when trying to use loop times as small as 20 ms.  You may need to go to a real time system or something hardware timed to get any precision or stability at those time scales.

Lynn

[apok]

wire the stop with a true constant, this will execute the loop once and wire a cntrl to the wait (ms)

maybe this is not what you want, not realizing you may want code to continuosly run for a certain time allocated...

[tangliang]

thank u so much!

[tangliang]

thank u!