Many times when people push up / down button for using elevator cabin, they may need to wait so long because of other people using the cabin in other floors. As a result some of them prefer other cabins or many choose staircase however, the cabin is programmed to arrive chosen floor even if there are no longer any people there .This problem is so common in places such as hospitals, hotels, and condominiums. But This problem can be eliminated simply by a detection sensor. In this system an ultrasonic sensor which is mounted on top of elevator door frame, detects the person who pushes the up / down button, then cabin moves to the chosen floor only if he or she stays in the detection zone which is shown by yellow line thus , this system not only cause less amount of waiting time and depreciation of elevator parts during continuous use but also save a large amount of electricity and related expenses. For children safety sensor detects objects taller than 120 cm.