Pressure transducer and Arduino

[DavePW]

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

[hrh1818]

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

[DavePW]

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