Timing Problems with PID Control of a Wind Tunnel

[thisischris99]

I have a VI written that reads in data from a pitot tube/anemometer in the wind tunnel. After setting a speed I want to be able to read 50 milliseconds of data from the Pitot Tube, put this data in an array along with the desired speed, and input these into a PID algorithm which regulates the output of a voltage controlling the speed of the Wind Tunnel. I tried using Timed Loops to no avail, and using the Elapsed TIme VI to set off a case structure outside of the loop however this only worked the first time the Elapsed Time output was True. Any Ideas?

(The VI is on a computer not connected to the network currently)

[viSci]

Can you show us the code?

[thisischris99]

Ignore the Voltage offset/Slope inputs

.

ClosedLoopPID.vi

[Wire Warrior]

You might try using the wait until next multiple millisecond VI. That might do it.

[viSci]

You need to condition your while loop to stop when your elapsed time triggers. This would give you 50ms of data. I think you may have other problems using single point DAQ at these data rate. Do you have a driver that support HW timed DAQ?