Sensor 4-20mA to 0-5V ADC Input Using 250 Ohm Resistor with Microcontroller 5V

Good day to all,

Please i need your Support in helping me to confirm if the block diagram i attached to this thread is correct. I want to read an analog Signal from a sensor and convert it to a digital Signal with the help of an in-built ADC in a microcontroller. I am not sure if the resistor i connected to the ADC Input is all i need to get the ADC of the microcontroller to receive the accurate Signal from the sensor or if i still need other components.

The operating voltage of the microcontroller is 5V

The Output analog voltage Signal from the sensor is from 0V to 5V

The Output analog current Signal from the sensor is from 4mA to 20mA

If the sensor outputs for example 4mA,then the Input voltage to the ADC of the microcontroller will be 1V using the 250 Ohms resistor. I would be glad if somebody could help me confirm if this Arrangement is correct. Once again thank you for the Support. Best regards.




NOTE: All other Connections with respect to the microcontroller have been taken care of. The only part i need help is the ADC section.

ADC-BLOCK-DIAGRAM

The 4-20ma analog devices is a very old standard. The devices usually rely on having a resistor to ground to work. Using a 250 ohm resistor should work just fine. I would however add a capacitor across that resistor to provide both an anti alias filter as well as some transient protection. The value of the capacitor depends on the frequency response of the analog signal.