02-21-2014 04:47 AM
Hi folks...
Am using LIFA/Arduino to measure a 4-20mA output from a pressure transducer (0-160bar).
All working well (using a current sense resistor across a analogue input) - but what I would now like to do is measure the rate of change of pressure (say delta P per minute) - Now I'm sure there is a very straight forward way of doing this but
my mind is in a fog currently as to how.........
Any ideas out there???
cheers
Dave
02-21-2014 05:57 PM
Labview's shift registers can be used to store previous samples and you can use the shift register to make a simple differentiator by taking the difference between the present value and a previous value. I f you are not familiar with shift registers do a Google search on the phrase "Labview Shift Register".
The following link shows a more sophisticated Digital Differentiator.
<http://www.dsprelated.com/showarticle/35.php>
hrh1818
02-24-2014 05:34 AM
Thanks hrh 1818...
After entering my question I did do some further reading up and found the answer as you have stated - Good ol shift registers. Have it setup now and appears to be working. Thanks for your answer..
Dave