Keyestudio Smart Little Turtle Robot V3 Manual page 171

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digitalWrite(right_ctrl,LOW);
analogWrite(right_pwm,200);
}
void back()//define the status of going back
{
digitalWrite(left_ctrl,HIGH);
analogWrite(left_pwm,200);
digitalWrite(right_ctrl,HIGH);
analogWrite(right_pwm,200);
}
void left()//define the status of turning left
{
digitalWrite(left_ctrl,HIGH);
analogWrite(left_pwm,200);
digitalWrite(right_ctrl,LOW);
analogWrite(right_pwm,200);
}
void right()//define the status of right turning
{
digitalWrite(left_ctrl,LOW);
analogWrite(left_pwm,200);
digitalWrite(right_ctrl,HIGH);
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