Andy, a 250 precision Res is what I always used in the field for years. Just check the voltage across the res with the pic. I would think it depends on the accuracy you need.
wayne
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Re: 4 -20mA Analogue input help
Andy, a 250 precision Res is what I always used in the field for years. Just check the voltage across the res with the pic. I would think it depends on the accuracy you need.
wayne
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Re: 4 -20mA Analogue input help
I'd recommend 0.1% or best and also an input protection for overvoltage on the PIC side. If for any reason the ground side of the resistor is disconnected, it is certain that the PIC will be destroyed.
Ioannis
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