I need to make a 4x 4-20mA measuring circuit with ads1115 (VDD = 5V) 4 channel 16bit ADC
I set ads1115 PGA to 4.096 gain and set circuit as below. once I set this 32000 ADC levels--> 4.096V--> 0.128mV
I am targetting to archive 0.128mV resolution.
R1 50ohm and R2 200ohm voltage divider is for regulating 5v to 4v. also, I set R2 200 ohm to get 4V at 20mA current.
R3 3.3k Ohm is there for reducing current flow into ADC1115 chip.
this is for a 3 wire sensor (24V DC supply, 4-20mA output and gnd)
** is this circuit configuration a reliable method to measure 4-20mA current using an MCU? **