arduino uno

hey have sensor detects motion , going use project im kinda stuck in how should program it?
i got toy tank going detect motion motion detector sensor , want sweep acroos every 90 degrees , stop 10 seconds , move again, once detects want stop , use ping sensor sensor stop @ distance shoot bbs.
so far have wote motion detector test out problem how should able use motion detector sensor in application c code, appreciated.
im going put example of code show how writen!
by way im using xband motion detector
my program:

void setup() {
 serial.begin(9600);
 serial.println("pulse test");

 pinmode(13, output);
 attachinterrupt(1, inthandler, change);
}

volatile int pulsecount = 0;

void inthandler() {
 pulsecount++;
}



void loop() {
 if (pulsecount > 2) {
   digitalwrite(13, high);
   if (pulsecount > 3) {
     serial.print("motion! ");
     serial.println(pulsecount);
   }
   digitalwrite(13, low);
 }
 if (pulsecount > 0 && pulsecount <= 3) {
   serial.println(pulsecount);
 }
 pulsecount = 0;
 delay(250);
}

hey have xband motion detector sensor , want use servo , ping sensor activated when motion detector detects motion far got motion detector im kinda stuck implement servo , ping activvated,  would appreciated or advice, or mentors can guide me project im building!
thanks in advance!
program code:

void setup() {
 serial.begin(9600);
 serial.println("pulse test");

  pinmode(13, output);
 attachinterrupt(1, inthandler, change);
}

volatile int pulsecount = 0;

void inthandler() {
 pulsecount++;
}



void loop() {
 if (pulsecount > 2) {
   digitalwrite(13, high);
   if (pulsecount > 3) {
     serial.print("motion! ");
     serial.println(pulsecount);
   }
   digitalwrite(13, low);
 }
 if (pulsecount > 0 && pulsecount <= 3) {
   serial.println(pulsecount);
 }
 pulsecount = 0;
 delay(250);
}

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