arduino+1602液晶实现简单电子时钟功能

mybag1

lantpark也曾做过类似的东西（http://www.geek-workshop.com/forum.php?mod=viewthread&tid=1248），用到了http://www.arduino.cc/playground/uploads/Code/DateTime.zip，实现了能显示日期和时间的功能。这几天在学习时，突然想到仅用字符串也能简单的实现电子时钟，时间用delay来计算，做好后，整整跑了一个下午，发现时间的误差几乎没有，还是可以接受的。

lcd 1602 接线采用四线连接法参照弘毅的教程
http://www.geek-workshop.com/forum.php?mod=viewthread&tid=78&reltid=955&pre_thread_id=0&pre_pos=1&ext=


代码如下：

1.     int LCD1602_RS=12;   
   
2.     int LCD1602_RW=11;   
   
3.     int LCD1602_EN=10;   
   
4.     int DB[] = { 6, 7, 8, 9};
   
5.     char logtxt[]="Local Time";
   
6.     char *sec[60]={"00","01","02","03","04","05","06","07","08","09","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30","31","32","33","34","35","36","37","38","39","40","41","42","43","44","45","46","47","48","49","50","51","52","53","54","55","56","57","58","59"};
   
7. 
   
8.    
   
9.     void LCD_Command_Write(int command)
   
10.     {
    
11.     int i,temp;
    
12.     digitalWrite( LCD1602_RS,LOW);
    
13.     digitalWrite( LCD1602_RW,LOW);
    
14.     digitalWrite( LCD1602_EN,LOW);
    
15.      
    
16.     temp=command & 0xf0;
    
17.     for (i=DB[0]; i <= 9; i++)
    
18.     {
    
19.        digitalWrite(i,temp & 0x80);
    
20.        temp <<= 1;
    
21.     }
    
22.      
    
23.     digitalWrite( LCD1602_EN,HIGH);
    
24.     delayMicroseconds(1);
    
25.     digitalWrite( LCD1602_EN,LOW);
    
26.      
    
27.     temp=(command & 0x0f)<<4;
    
28.     for (i=DB[0]; i <= 9; i++)
    
29.     {
    
30.        digitalWrite(i,temp & 0x80);
    
31.        temp <<= 1;
    
32.     }
    
33.      
    
34.     digitalWrite( LCD1602_EN,HIGH);
    
35.     delayMicroseconds(1);
    
36.     digitalWrite( LCD1602_EN,LOW);
    
37.     }
    
38.      
    
39.     void LCD_Data_Write(int dat)
    
40.     {
    
41.     int i=0,temp;
    
42.     digitalWrite( LCD1602_RS,HIGH);
    
43.     digitalWrite( LCD1602_RW,LOW);
    
44.     digitalWrite( LCD1602_EN,LOW);
    
45.      
    
46.     temp=dat & 0xf0;
    
47.     for (i=DB[0]; i <= 9; i++)
    
48.     {
    
49.        digitalWrite(i,temp & 0x80);
    
50.        temp <<= 1;
    
51.     }
    
52.      
    
53.     digitalWrite( LCD1602_EN,HIGH);
    
54.     delayMicroseconds(1);
    
55.     digitalWrite( LCD1602_EN,LOW);
    
56.      
    
57.     temp=(dat & 0x0f)<<4;
    
58.     for (i=DB[0]; i <= 9; i++)
    
59.     {
    
60.        digitalWrite(i,temp & 0x80);
    
61.        temp <<= 1;
    
62.     }
    
63.      
    
64.     digitalWrite( LCD1602_EN,HIGH);
    
65.     delayMicroseconds(1);
    
66.     digitalWrite( LCD1602_EN,LOW);
    
67.     }
    
68.      
    
69.     void LCD_SET_XY( int x, int y )
    
70.     {
    
71.       int address;
    
72.       if (y ==0)    address = 0x80 + x;
    
73.       else          address = 0xC0 + x;
    
74.       LCD_Command_Write(address);
    
75.     }
    
76.      
    
77.     void LCD_Write_Char( int x,int y,int dat)
    
78.     {
    
79.       LCD_SET_XY( x, y );
    
80.       LCD_Data_Write(dat);
    
81.     }
    
82.      
    
83.     void LCD_Write_String(int X,int Y,char *s)
    
84.     {
    
85.         LCD_SET_XY( X, Y );    //设置地址
    
86.         while (*s)             //写字符串
    
87.         {
    
88.           LCD_Data_Write(*s);   
    
89.           s ++;
    
90.         }
    
91.     }
    
92.      
    
93.     void setup (void)
    
94.     {
    
95.       int i = 0;
    
96.       for (i=6; i <= 12; i++)
    
97.        {
    
98.          pinMode(i,OUTPUT);
    
99.        }
    
100.       delay(100);
     
101.       LCD_Command_Write(0x28);//4线 2行 5x7
     
102.       delay(50);
     
103.       LCD_Command_Write(0x06);
     
104.       delay(50);
     
105.       LCD_Command_Write(0x0c);
     
106.       delay(50);
     
107.       LCD_Command_Write(0x80);
     
108.       delay(50);
     
109.       LCD_Command_Write(0x01);
     
110.       delay(50);
     
111.      
     
112.     }
     
113.      
     
114.     void loop (void)
     
115.     {
     
116. 
     
117. 
     
118.        for(int index=0,minindex=59,hourindex=12;index<60;index++)   //这里设定的初始时间为12:59:00
     
119.        {
     
120.          LCD_Command_Write(0x01);
     
121.          delay(50);
     
122.          LCD_Write_String(3,0,logtxt);
     
123.          LCD_Write_String(3,1,sec[hourindex]);
     
124.          LCD_Write_Char(6,1,0x3a);
     
125.          LCD_Write_String(7,1,sec[minindex]);
     
126.          LCD_Write_Char(10,1,0x3a);
     
127.          LCD_Write_String(11,1,sec[index]);
     
128. 
     
129.          delay(950);
     
130.          if (index==59)
     
131.          {
     
132.            index=-1;
     
133.            minindex++;
     
134.            if (minindex==60)
     
135.            {
     
136.              minindex=0;
     
137.              hourindex++;
     
138.              if (hourindex==24)
     
139.              {
     
140.                hourindex=0;
     
141.              }
     
142.            }
     
143. 
     
144.          }
     
145.        }
     
146.      
     
147.     }

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实现效果

swim

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