功能介绍：

使用STC89C52（STC89C52数据手册）单片机设计，设有8个按键，3个按键模拟硬币（5元、1元、5角），另外5个按键模拟货物选择，一块12864显示屏。

步骤：

1.开机启动显示货物价格列表，自动切换列表。

2.可以选择①—⑤种货物（或更多）。

3.按对应按键可选择该货物。

4.选择后，提示要投进的金额，并显示投币有效时间30秒（可修改）。

5.按键模拟投币，有5元、1元、5角。

6.投币金额等于或大于所选货物的金额则购物成功。

7.若投币不足，则30秒后自动退回。(Functional introduction:

Using STC89C52 (STC89C52 Data Handbook) MCU design, there are 8 buttons, 3 buttons to simulate coins (5 yuan, 1 yuan, 5 jiao), and 5 buttons to simulate the selection of goods, a 12864 display.

Step:

The 1. boot starts to display the list of goods price, and automatically switches the list.

2. you can choose 1 - 5 kinds of goods (or more).

3. the goods are selected according to the corresponding keys.

4., after the selection, prompt the amount to be invested, and show the valid time of 30 seconds (can be modified).

5. button to simulate the coin, there are 5 yuan, 1 yuan, 5 corners.

6. the amount of money that is equal to or greater than the amount of the selected goods is purchased successfully.

7. if the money is insufficient, it will be returned automatically after 30 seconds.)