car advancement

//#include <Servo.h>
int Left_motor_go = 8;    //左电机前进(IN1)
int Left_motor_back = 9;  //左电机后退(IN2)

int Right_motor_go = 10;    // 右电机前进(IN3)
int Right_motor_back = 11;  // 右电机后退(IN4)

void setup() {
  //初始化电机驱动IO为输出方式
  pinMode(Left_motor_go, OUTPUT);     // PIN 8 8脚无PWM功能
  pinMode(Left_motor_back, OUTPUT);   // PIN 9 (PWM)
  pinMode(Right_motor_go, OUTPUT);    // PIN 10 (PWM)
  pinMode(Right_motor_back, OUTPUT);  // PIN 11 (PWM)
}
void run(int time)  // 前进
{
  digitalWrite(Right_motor_go, HIGH);  // 右电机前进
  digitalWrite(Right_motor_back, LOW);
  analogWrite(Right_motor_go, 100);  //PWM比例0~255调速，左右轮差异略增减
  analogWrite(Right_motor_back, 0);
  digitalWrite(Left_motor_go, LOW);  // 左电机前进
  digitalWrite(Left_motor_back, HIGH);
  analogWrite(Left_motor_go, 0);  //PWM比例0~255调速，左右轮差异略增减
  analogWrite(Left_motor_back, 100);
}

void loop() {
  delay(500);
  run(10);  //前进
}