通过两个超声波发射和接收测得距离 然后通公式算出物体位置X,Y然后通过按键送数码管显示，第一按键显示发射1的距离，第二个按键显示发射2的距离，第三个按键显示X,Y，实现超声波定位-Ultrasonic transmitting and receiving through two measured and then pass the formula calculated from the position of objects X, Y and then button to send digital display, the first launch of a button to display the distance, the second button to display the distance 2 launch, the third button Display X, Y, to achieve ultrasonic positioning