I am making a line follower robot. The issue is trying to make the motors run.
The L239D module has 4 input pins (to control two motors), 4 output pins (to drive motors), and 6 power pins (5V, 5V, GND, GND, 9/12V, and 9/12V).
I have used one 5V pin to connect it to an Arduino's 5V supply and one of the 9/12V pins to two 9V batteries in series.
The motors are barely running and when the robot is on the ground it is not able to move. I even tried three 9V batteries in series to get the voltage up to 27V but it doesn't help.