int spd=180;            //類比寫法初始轉速可以自由設定(0-255)
int turnspd = spd-60;                  
const int IN1 = 10;     //類比寫法必須設定在有PWM的腳位(有~毛毛蟲符號)
const int IN2 = 11;     
const int IN3 = 5;      
const int IN4 = 6;      

void setup() 
{
  Serial.begin(9600);   
  pinMode(5,OUTPUT);    
  pinMode(6,OUTPUT);
  pinMode(11,OUTPUT);
  pinMode(10,OUTPUT);

}
 
void loop() {
 
 
}

void Forward()            //車子前進子程式
{
  analogWrite(IN1, spd);    //類比寫法(IN1, 轉速)
  analogWrite(IN2, 0);
  analogWrite(IN3, spd);
  analogWrite(IN4, 0);
} 
void Backward()             //車子後退子程式
{
  analogWrite(IN1, 0);
  analogWrite(IN2, spd);
  analogWrite(IN3, 0);
  analogWrite(IN4, spd);
} 

void Stop()                  //車子停止子程式
{
  analogWrite(IN1, 0);
  analogWrite(IN2, 0);
  analogWrite(IN3, 0);
  analogWrite(IN4, 0);
}

void Left( )                 //車子左轉子程式
{
  analogWrite(IN1, spd);
  analogWrite(IN2, 0);
  analogWrite(IN3, turnspd);
  analogWrite(IN4, 0);
} 

void Right()                 //車子右轉子程式
{
  analogWrite(IN1, turnspd);
  analogWrite(IN2, 0);
  analogWrite(IN3, spd);
  analogWrite(IN4, 0);
}