NodeMCU+电机驱动扩展板 电机只能一个方向转

void setup(){
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(0, OUTPUT);
  pinMode(2, OUTPUT);

}
void Forward() //Code to rotate the wheel forward 
{
    analogWrite(5,600); 
    analogWrite(4,600); 
    digitalWrite(0,LOW);
    digitalWrite(2,LOW);
    //analogWrite(5,0);
}

void Reverse() //Code to rotate the wheel Backward  
{
    analogWrite(5,600);
    analogWrite(4,600); 
    digitalWrite(0,HIGH); 
    digitalWrite(2,HIGH);
}

void Stop() //Code to stop both the wheels
{
    analogWrite(5,0);
    digitalWrite(0,LOW);
    analogWrite(4,0);
    digitalWrite(2,LOW); 
}

void zz() //Code to Turn_left the wheel forward 
{
    analogWrite(5,600); 
    analogWrite(4,600); 
    digitalWrite(0,HIGH);
    digitalWrite(2,LOW);
}

void yz() //Code to Turn_right the wheel Backward  
{
    analogWrite(5,600); 
    analogWrite(4,600);
    digitalWrite(0,LOW); 
    digitalWrite(2,HIGH); 
}