（1）、自动售货机可以出售4种货物，每种商品的数量和单价在初始化时设定，并存储在存储器中；

（2）、采用模拟开关分别模拟5角和一元的硬币进行购物，并通过按键来选择商品；

（3）、系统能够根据用户输入的硬币，判断钱币是否够，当所投硬币达到或超过购买者所选面值时，则根据顾客要求自动售货，并找回剩余的硬币，然后回到初始状态。当所投硬币不够时，则给出提示，并通过一个复位键退回所投硬币，然后回到初始状态。

-(1), vending machines can sell four kinds of goods, each commodity quantity and price setting in the initialization and stored in the memory　(2), the use of analog switches, respectively, 5 analog angle and one dollar coins shopping, and through the button to select the goods　(3), the system can be based on user input of coins, coin to determine whether or not enough, when the cast coins reached or exceeded the face value of the selected buyers, then in accordance with the request of the customer Vending, and retrieve the remaining coins, and then returned to initial state. When enough coins cast, then gives tips through a reset button to return the coins to vote, and then returned to initial state.