I'm new to ECE and as a beginner project I've taken apart an RC car and attached an Arduino to the DC motors with an L298N module for control. The goal is for the car to drive a certain path with pre-programmed instructions. Everything is working, but I've noticed a constant drop in current (measured with a multimeter) as the motors run. This results in a lot of variance in the path the car takes. I'm powering the L298N with 8 double A batteries and powering the Arduino with a separate power supply.
Is there a way I can ensure that both motors receive steady current? If there is a better way to have the RC car consistently follow a set path or just tips you have for a beginner I'm open to any suggestions.
Thanks in advanced!