DTMF 1

#define m11 2
#define m12 3
#define m21 4
#define m22 5

#define D0 8
#define D1 9
#define D2 10
#define D3 11
 void forward()
 {
   digitalWrite(11,HIGH);
   digitalWrite(10,LOW);
   digitalWrite(9,HIGH);
   digitalWrite(8,LOW);

   }
   void back()
   {
     digitalWrite(11,LOW);
   digitalWrite(10,HIGH);
   digitalWrite(9,LOW);
   digitalWrite(8,HIGH);

   }
   void left()
   {
     digitalWrite(11,HIGH);
   digitalWrite(10,LOW);
   digitalWrite(9,LOW);
   digitalWrite(8,LOW);

   }
   void  right()
   {
     digitalWrite(11,LOW);
   digitalWrite(10,LOW);
   digitalWrite(9,HIGH);
   digitalWrite(8,LOW);

   }
   void stop()
   {
     digitalWrite(11,LOW);
   digitalWrite(10,LOW);
   digitalWrite(9,LOW);
   digitalWrite(8,LOW);

   }
void setup() {
 pinMode(D0,INPUT);
   pinMode(D1,INPUT);
  pinMode(D2,INPUT);
  pinMode(D3,INPUT);
   pinMode(m11,OUTPUT);
   pinMode(m12,OUTPUT);
   pinMode(m21,OUTPUT);
   pinMode(m22,OUTPUT);

}

void loop() {
  int temp1=digitalRead(D0);
  int temp2=digitalRead(D1);
  int temp3=digitalRead(D2);
  int temp4=digitalRead(D3);

  if(temp1==0 && temp2==1 && temp3==0&& temp4==0)
  forward();
  if(temp1==0 && temp2==0 && temp3==0 && temp4==1)
  back();
  if(temp1==0 && temp2==0 && temp3==1 && temp4==0)
  left();
  if(temp1==0 && temp2==1 && temp3==1 && temp4==0)
  right();
  if(temp1==1 && temp2==0 && temp3==1 && temp4==0)
  stop();

}