Keyestudio Smart Little Turtle Robot V3 Manual page 210

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void car_front()//go front
{
digitalWrite(left_ctrl,LOW);
analogWrite(left_pwm,200);
digitalWrite(right_ctrl,LOW);
analogWrite(right_pwm,200);
}
void car_back()//go backward
{
digitalWrite(left_ctrl,HIGH);
analogWrite(left_pwm,200);
digitalWrite(right_ctrl,HIGH);
analogWrite(right_pwm,200);
}
void car_left()//turn left
{
digitalWrite(left_ctrl,HIGH);
analogWrite(left_pwm,200);
digitalWrite(right_ctrl,LOW);
analogWrite(right_pwm,200);
}
void car_right()//turn right
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