Hello sir! I am working on a final year project which is underground cable fault detection using arduino board. I want to know that how to use the 5V relay module on that and how the connections are made with relay module. Please help me in this case. I have already bought the circuit components and maded the required connections appropriately. But the problem is that the lcd display shows only NF. When i created the fault through switches, it does not show the fault distances.
I have attached the program code below.
project_final.ino (2.13 KB)