First pass at an RC car control program.

rover1.ino

int pinI1=8;
int pinI2=11;
int speedpinA=9;
int pinI3=12;
int pinI4=13;
int speedpinB=10;
int speed =255;
int turnspeed =255;
 
void setup()
{
  pinMode(pinI1,OUTPUT);
  pinMode(pinI2,OUTPUT);
  pinMode(speedpinA,OUTPUT);
  pinMode(pinI3,OUTPUT);
  pinMode(pinI4,OUTPUT);
  pinMode(speedpinB,OUTPUT);
}
 
void forward()
{
     analogWrite(speedpinB,speed);
     digitalWrite(pinI4,HIGH);
     digitalWrite(pinI3,LOW);
}
void backward()
{
     analogWrite(speedpinB,speed);
     digitalWrite(pinI4,LOW);
     digitalWrite(pinI3,HIGH);
}
void left()
{
     analogWrite(speedpinA,turnspeed);
     digitalWrite(pinI2,LOW);
     digitalWrite(pinI1,HIGH);
}
void right()
{
     analogWrite(speedpinA,turnspeed);
     digitalWrite(pinI2,HIGH);
     digitalWrite(pinI1,LOW);
}
void straight()
{
    analogWrite(speedpinA,speed);
    digitalWrite(pinI2,LOW);
    digitalWrite(pinI1,LOW);
}
void stop()
{
     digitalWrite(speedpinA,LOW);
     digitalWrite(speedpinB,LOW);
     delay(1000);
}

void loop()
{
  stop();
  delay(2000);

  forward();
  delay(1000);
  right();
  delay(1000);
  left();
  delay(1000);
  straight();
  delay(2000);

  stop();
  delay(2000);

  right();
  backward();
  delay(2000);

}