I'm just a hobbyist and actually from software side. Trying to build a simple water level indicator and found the following circuit using the IC ULN2003.
But due to my very less knowledge I'm not able to figure out the requirement of that since its straight forward without that IC
Here is the schematic I have got from a search
But its the same if we wire the following way, isnt it?
I'm not able to understand the purpose of that ULN2003 in this case, since in my schematic as well it does almost the same I though..
So what that IC really does in that circuit rather than just closing a circuit