Topic summary4-20 mA Expand Summary Extracted from the Wikipedia article Current loop. External linksFundamentals, System Design, and Setup for the 4 to 20 mA Current Loop"4–20 mA Current Loop Primer"(PDF) 2017.What Voltage do I need to operate my 4...20 mA transducer?Current signal systemsHow to read current loop using arduinoTypes of 4-20 mA Current Loop Wikipedia source