**EDIT: ** In Comment #2 and #28 you can find the solution to the problem I described in the topic. Also, there's another problem in this topic which you can read it from comment #10, the solution to that problem is in the comment #26.
I'm trying to use an ADS1015 and a voltage divider to measure the resistance of a PT100 temperature sensor.
Here's my circuit:
And this is how it looks on Breadboard (consider the potentiometer as the PT100):
My code works fine, my problem is when I connect the PT100 to the Breadboard, or lets say it better, when I connect the +5V or GND wires to the divider, the PT100 resistance drops about 5/10 Ohms,
How do I measure the resistance? I disconnect the power and measure the PT100 resistance, so the resistance drop happens when no voltage is applied to the circuit. Also when I disconnect the ADS1015 module from breadboard, the resistance is correct one again, which is basically just the same thing as disconnecting the wires.