目录
一、主要功能
1、LCD1602液晶显示
2、矩阵按键选择货物和数量已经模拟投币
3、投币价格大于货物总价，继电器出货和蜂鸣器警报提示和找零
4、若投币数小于货物总价，则LCD显示继续投币
二、使用步骤
系统运行后，LCD1602显示系统初始界面，可通过矩阵按键选择货物，LCD液晶显示商品价格，共有8种价格货物可供选择，且选择的货物对应LED会有指示。可通过按键选择货物数量，当需要
返回时可按下返回键，选择好商品和数量后可按下确认键，此时LCD显示累计货物总价，此时可通过键盘输入投币数，LCD显示投币值，若投币数值大于等于货物累计总价，则驱动继电器出货，且蜂鸣器报警提示，LCD显示找零数。若投币数小于货物累计总价，则LCD显示继续投币。
三、硬件资源
1、51单片机核心模块
2、矩阵按键模块
3、LED灯模块
4、蜂鸣器模块
5、继电器模块
6、LCD1602显示模块
四、软件设计
#include<reg51.h>
#define WAIT_SALE 0 //定义1602显示状态
#define NO_WATER 1
#define INPUT_MONEY 2
#define SALING 3
#define CHANGE 4
#define CANCLE 5
#define NO_DATA 0
#define water_change(x, y) ((x) & (~(0x01 << y)))
#define uint unsigned int
#define uchar unsigned char
unsigned char water_total[] = {10, 10, 10, 10, 10, 10, 10, 10};
unsigned char water_price[] = {1, 2, 3, 4, 5, 6, 7, 8};
uchar code wait_sale[]="for sale";
uchar code no_water[] = "no water!";
uchar code price[] = "price:";
uchar code number[] = "num:";
uchar code sum[] = "SUM:";
uchar code input[] = "INPUT:";
uchar code change[] = "change:";
uchar code put_water[] = "put water...";
uchar code cancle[] = "cancle...";
unsigned char e=0x00;
sbit P2_0=P2^0;
sbit P2_1=P2^1;
sbit P2_2=P2^2;
sbit P2_3=P2^3;
sbit lcd_en=P3^4;
sbit rs=P3^2;
sbit rw = P3^3;
sbit beep=P3^6;
sbit rly = P3^7;
void lcd_1602_delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void lcd_1602_write_com(uchar com) //写命令
{
rs=0;
rw=0;
P2=com;
lcd_1602_delay(5);
lcd_en=1;
lcd_1602_delay(5);
lcd_en=0;
}
void lcd_1602_write_data(uchar date) //写数据
{
rs=1;
rw=0;
P2=date;
lcd_1602_delay(5);
lcd_en=1;
lcd_1602_delay(5);
lcd_en=0;
}
void lcd_1602_init() //LCD1602初始化函数
{
lcd_en=0;
lcd_1602_write_com(0x38);
lcd_1602_write_com(0x0e);
lcd_1602_write_com(0x06);
lcd_1602_write_com(0x01);
}
void lcd_1602_saling(uint type, uint num)
{
lcd1602_info_display(SALING, type, num);
lcd_1602_wait_sure();
}
/*************************************************/
void delay1(unsigned int t) // 延时函数
{
unsigned int i,j;
for(i=0;i<t;i++)
for(j=0;j<10;j++);
}
void main()
{
unsigned char ok = 0, water_type = -1, water_is_choose = 0;
char water_count = 0;
unsigned int flag = 0, money = 0, need_money;
lcd_1602_init();
again:
ok = 0; water_type = -1; water_count = 0; water_is_choose = 0;
flag = 0; money = 0; need_money = 0;
lcd1602_info_display(WAIT_SALE, 0, 0);
while(!ok)
{
flag=key();
if(flag)
{
switch(e)
{
case(0x00):
water_type++;
water_is_choose = 1;
if(water_type == 8)
{
water_type = 0;
}
P0 = water_change(0xff, water_type);
break;
case(0x01):
water_type--;
water_is_choose = 1;
if(water_type == -1 || water_type == -2)
{
water_type = 7;
}
P0 = water_change(0xff, water_type);
break;
case(0x02):
if(water_is_choose == 1)
{
water_count++;
if(water_count > water_total[water_type])
{
water_count = water_total[water_type];
}
}
break;
case(0x03):
if(water_is_choose == 1)
{
water_count--;
if(water_count < 0)
{
water_count = 0;
}
}
break;
case(0x0e): // 返回
goto again;
break;
case(0x0f): // 确认
if(water_is_choose == 1)
{
ok=1;
}
break;
default:
break;
}
lcd_1602_saling(water_type, water_count);
}
}
}
五、实验现象
演示视频：
