topic Re: Programming in this formula in LabVIEW

Programming in this formula

crockengineer — Tue, 31 Mar 2009 18:58:54 GMT

If I have a simple program consisting of a DAQ assistant inside a while loop with its data output in volts is there anyway to program in the following formula?

Acceleration= {((Vout1/125)/0.5)-((Vout2/125)/0.5)}/(T2-T1)

so if I start the program Vout1 will be the first data output and T1 will be the time in sec (0 sec) and Vout2 will be the second data output at time T2. Essentially I am trying to convert the voltage output from my device into acceleration as the program runs. Thanks.

Re: Programming in this formula

RavensFan — Tue, 31 Mar 2009 19:02:13 GMT

Yes. You want a shift register. Feed the voltage into a shift register on the right hand side. The left hand side of the shift register will be the value from the previous iteration of the loop.

Re: Programming in this formula

crockengineer — Tue, 31 Mar 2009 19:07:34 GMT

what about T1 and T2?

Re: Programming in this formula

Chris_VH — Tue, 31 Mar 2009 19:10:27 GMT

This should be what youre looking for, replacing the random rnumbers with DAQ Assist:

Also, that 500 ms wait was just for a quick glance making sure I wired everything correctly, you wouldn't need that per se.

Message Edited by Chris_VH on 03-31-2009 02:10 PM

Re: Programming in this formula

crockengineer — Tue, 31 Mar 2009 19:52:33 GMT

delta T will be in Millisecond correct?

Re: Programming in this formula

Chris_VH — Tue, 31 Mar 2009 19:55:30 GMT

Up to you, but in MY example, dividing by 1000 will give dT in seconds.