Arduino act as two wire current loop sensor

Projects General Guidance
1

Hello,
To make simple my project, I want to make arduino as two wire 4-20mA sensor. As I know many industrial sensor are using 2 wire 4-20mA signal.
I still not found yet the simple reference schematic.
May all of you have schematic reference about arduino as 2 wire current loop transmiter or arduino loop powered 4-20mA ?
Thank you

Regards

Sony

2

GOOGLE : Arduino as 4-20ma sensor

3

Here is a circuit for you, this is one of thousands.

4

A 250 Ohm resistor is all you need to interface a 4-20 mA sensor. In the circuit below, C1 and R2 are optional, but help protect the Arduino from transients and overvoltage. Output V2 is 1 to 5V.

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5

Thank for your response.
Most of I search in google result are arduino as reader 4-20mA that is not what I mean.
Let's say I want to arduino as 2 wire 4-20mA temperature transmitter.
For clear understanding what I need maybe you can search as refferences with key words "2 wire transmitter"

Thanks

6

I still not found yet the simple reference schematic

You won't, because current loop transmitters are not simple. Just buy one.

7

Everything easy if just buy but it will make "brain always new" :wink:

8

See member allanhurst’s post from 2018:

https://forum.arduino.cc/index.php?topic=533805.msg3639766#msg3639766

9

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