James Robot dc motors wont work

ive been trying months cannot figure simple thing out. beginner doing 7 year old , hoping stumped.
i followed instructable. motors work when test them battery

here code using

//since using servos , ultrasonic sensors in robot include libraries written make use easier
#include <servo.h>
#include <newping.h>

//below symbolic constants. instead of having type in non-sensical pin number each time want can write easy understand name represents pin, compiler replace names numbers
#define leftmotorforward 3
#define leftmotorbackward 6
#define rightmotorforward 11
#define rightmotorbackward 14
#define ustrigger 3
#define usecho 2
#define maxdistance 100
#define led 13

//here have created 2 'objects', 1 servo , 1 ultrasonic sensor
servo servo;
newping sonar(ustrigger, usecho, maxdistance);

//below creating unsigned integer variables use later on in code. unsigned have postive values
unsigned int duration;
unsigned int distance;
unsigned int frontdistance;
unsigned int leftdistance;
unsigned int rightdistance;
unsigned int time;

void setup()                                            //this block happens once on startup
{
  //serial.begin(115200);                              //i have included serial initialize commented out, if want debug , print information serial monitor uncomment
 
  //here setting pin modes. sending out signals pins set them outputs
  pinmode(leftmotorforward, output);
  pinmode(leftmotorbackward, output);
  pinmode(rightmotorforward, output);
  pinmode(rightmotorbackward, output);
  pinmode(led, output);
  servo.attach(4);                                    //the servo attached pin 4
}

void loop()                                           //this block repeats while arduino turned on
{
  delay(500);
  servo.write(90);                                    //rotate servo face front                 
  scan();                                             //go scan function
  frontdistance = distance;                           //set variable frontdistance value of distance returned scan function
  if(frontdistance > 40 || frontdistance == 0)        //if there nothing infront of robot within 40cm or distance value 0 (which newping libary means no ping returned) then...
  {
   moveforward();                                     //go moveforward function
  }
  else                                                //else (if there infront of robot within 40cm) then...
  {
    movestop();                                       //go movestop function
    servo.write(167);                                 //move servo left (my little servos didn't going 180 played around value until worked nicely)
    delay(500);                                       //wait half second servo there
    scan();                                           //go scan function
    leftdistance = distance;                          //set variable leftdistance distance on left
    servo.write(0);                                   //move servo right
    delay(500);                                       //wait half second servo there
    scan();                                           //go scan function
    rightdistance = distance;                         //set variable rightdistance distance on right
    if(rightdistance < leftdistance)                  //if distance on right less on left then...
    {
     moveleft();                                      //go moveleft function
     delay(500);                                      //pause program half second let robot turn
    }
    else if(leftdistance < rightdistance)             //else if distance on left less on right then...
    {
     moveright();                                     //go moveright function
     delay(500);                                      //pause program half second let robot turn
    }
    else                                              //if distance on left , right equal (highly unlikely put in none less) then...
    {
     movebackward();                                  //go movebackward function
     delay(200);                                      //pause program 200 milliseconds let robot reverse
     moveright();                                     //go moveright function
     delay(200);                                      //pause program 200 milliseconds let robot turn right
    }
  }
}

void moveforward()                                    //this function tells robot go forward
{
  digitalwrite(leftmotorbackward, low);
  digitalwrite(leftmotorforward, high);
  digitalwrite(rightmotorbackward, low);
  digitalwrite(rightmotorforward, high);
}

void movebackward()                                  //this function tells robot move backward
{
  digitalwrite(leftmotorforward, low);
  digitalwrite(leftmotorbackward, high);
  digitalwrite(rightmotorforward, low);
  digitalwrite(rightmotorbackward, high);
}

void moveleft()                                      //this function tells robot turn left
{
  digitalwrite(leftmotorforward, low);
  digitalwrite(leftmotorbackward, high);
  digitalwrite(rightmotorbackward, low);
  digitalwrite(rightmotorforward, high);
 
}

void moveright()                                    //this function tells robot turn right
{
  digitalwrite(leftmotorbackward, low);
  digitalwrite(leftmotorforward, high);
  digitalwrite(rightmotorforward, low);
  digitalwrite(rightmotorbackward, high);
}

void movestop()                                     //this function tells robot stop moving
{
  digitalwrite(leftmotorbackward, low);
  digitalwrite(leftmotorforward, low);
  digitalwrite(rightmotorforward, low);
  digitalwrite(rightmotorbackward, low);
}
void scan()                                         //this function determines distance things away ultrasonic sensor
{
  delay(50);
  time = sonar.ping();
  distance = time / us_roundtrip_cm;
}

the motors connected pin 3,6,11,14
i using 4 aa , 1 9v plugged arduino
my servo , ping sensor seem work. move , forth. not action outta motors
i hook 4aa ipositive nto pin 8 , ground arduino
please me son lol
thanks
if need more infor ask. grateful insight

quote from: jmaderer on apr 24, 2015, 02:11 am

i hook 4aa ipositive nto pin 8 , ground arduino

what mean?

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