4-20 mA is not a variable resistor... it is called "current loop" communication and it still remains popular for industrial sensor interfacing.It's been discussed before... have a look here: http://arduino.cc/forum/index.php/topic,19613.0.html
will the 12v overload the arduino pin ?
thanks guys for the infoi will power the device using 12vso basically i can put a 220 ohm resistor between the plus and minus and then read into an arduino pin on the pluswill the 12v overload the arduino pin ?
so it appears the arduino can not use this device because it is designed to operate on a minimum of 12vi will look to see if i can find a thermocouple transducer that outputs 0-5 v
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