In order to understand how a 4-20 mA current transmission is control  and how it works,

We are going to make a device that controls the 4-20m amp with the help of a transistor, LM358 and resistors. as shown in circuit diagram

Circuit diagram

Circuit Diagram

Connection with Arduino

 We are giving PWM ( Pulse Width Modulation is a technique for getting analog results with digital means. Digital control is used to create a square wave, a signal switched between on and off. This on-off pattern can simulate voltages in between the full Vcc of the board )

Through the pin 3 we give the pwm to the the +ve side of the op-amp as input

Schematics diagram

Schematic Diagram


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