source code for ultrasonic parking control using AT89c51.this is not my program.but i uploaded for the benefit of the people

this for automatic car parking system it displays the space availability and also control the gate in parking area-this is for automatic car parking system it displays the space availability and also control the gate in parking area

带停机步进电机正反转控制，很详细的介绍步进电机正反转与停机的功能，有注释，已经调试成功-Reversible control of stepper motor with parking, a very detailed descr iption of the stepper motor reversing and stop function, with annotations, has been successful commissioning