Hello,
I am operating motorized ball valve using ESP32 and relay module, ball valve has two feedback voltage to detect close and open position of valve, there are two output wires one to detect close state and one to detect open state of valve. see below image.

My question is how to collect feedback using Arduino/ESP32 to detect open/close state of valve ?
Open state voltage between "R1(BLUE) and Negative(BLACK) will be 24v DC
Close state voltage between "R2(YELLOW) and Negative(BLACK) will be 24v DC

 

Welcome to AAC.

I can’t really understand your question because the answer to the plain version of it is so obvious. What difficulty are you having in working out how to do this? Where are you getting stuck?

 

How to measure 24v DC in ESP32?
1) using voltage sensor.

2) Using Optocoupler Isolation

3) Using voltage divider resisters

Which is most efficient to detect 24v dc?