/* Example using one switch to detect collision
   Assume switch on port 10 
   Motors on 1 and 2    */
void main()   
{
    start_press();  //wait for START
    
    motor(1,10);
    motor(2,100);    // drive forwards, full speed
	 
	 do { }  // do nothing  ( keep going)
    while(!digital(10)); // until hit something
	 
    ao();   // stop - we  have hit something
    beep();          // double beep
    sleep(0.3);
    beep();
    printf("oops!\n");    // print message
}