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Author Topic: how to Find Change in Current?  (Read 346 times)
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Peshawar, Pakistan
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Hi!
there are some sensors, whose outputs variation is 4-20 mA. My question is how to find this variation through Arduino  ?

Plz Help me...ASAP smiley-sad

Thanx
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Hey,

Try this link
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1205745528

You can set up a resistor and measure the voltage drop across the resistor then use simple V=IR to find current.
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Manchester (England England)
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This sounds like a current loop output. Is it a passive one or active one. That is does it actually generate a voltage and will produce a voltage if a resistor is connected across it. Or is it just a load that when you put a voltage into it will draw the current.
http://en.wikipedia.org/wiki/Current_loop
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