L289N giving different voltages at same i/p pwm


i using 2 driving motors in line follower , l298n motor controller control them.
at same pwm signal given drive both motors 1 motor runs faster, hence preventing bot going straight.

i checked voltages @ pins pwm i/p controller same voltage output 2 motors different.

this voltage proportional pwm both motors have offset

at full speed(255) bot goes straight, i.e same voltage given controller.

i using arduino nano
12v power supply(lead acid)
12v motors(200rpm)

please me solve issue....

thanks in advance :)

not motors made equal.
swap motors on bot, , see it wonders off in different direction.
you map pwm value of 1 motor lower value.
leo..



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