【新手求助】mega2560 i2c连接 lcd 2004

毛毛毛毛毛

我有一块lcd2004的板子用了i2c的转接芯片，连接在mega2560上的20 21口。但是刷写示例程序后无法显示任何内容，只有两行白块。之前连接i2c的lcd1602的时候也遇到了同样的问题，该如何解决？

Damn_intuition

代码放上来

毛毛毛毛毛

Damn_intuition 发表于 2013-3-14 19:30
代码放上来

1. //DFRobot.com
   
2. //Compatible with the Arduino IDE 1.0
   
3. //Library version:1.1
   
4. #include <Wire.h>
   
5. #include <LiquidCrystal_I2C.h>
   
6. 
   
7. #if defined(ARDUINO) && ARDUINO >= 100
   
8. #define printByte(args)  write(args);
   
9. #else
   
10. #define printByte(args)  print(args,BYTE);
    
11. #endif
    
12. 
    
13. uint8_t bell[8]  = {0x4,0xe,0xe,0xe,0x1f,0x0,0x4};
    
14. uint8_t note[8]  = {0x2,0x3,0x2,0xe,0x1e,0xc,0x0};
    
15. uint8_t clock[8] = {0x0,0xe,0x15,0x17,0x11,0xe,0x0};
    
16. uint8_t heart[8] = {0x0,0xa,0x1f,0x1f,0xe,0x4,0x0};
    
17. uint8_t duck[8]  = {0x0,0xc,0x1d,0xf,0xf,0x6,0x0};
    
18. uint8_t check[8] = {0x0,0x1,0x3,0x16,0x1c,0x8,0x0};
    
19. uint8_t cross[8] = {0x0,0x1b,0xe,0x4,0xe,0x1b,0x0};
    
20. uint8_t retarrow[8] = {        0x1,0x1,0x5,0x9,0x1f,0x8,0x4};
    
21.   
    
22. LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 20 chars and 4 line display
    
23. 
    
24. void setup()
    
25. {
    
26. //  Serial.begin(57600);
    
27.   lcd.init();                      // initialize the lcd
    
28.   lcd.backlight();
    
29.   
    
30.   lcd.createChar(0, bell);
    
31.   lcd.createChar(1, note);
    
32.   lcd.createChar(2, clock);
    
33.   lcd.createChar(3, heart);
    
34.   lcd.createChar(4, duck);
    
35.   lcd.createChar(5, check);
    
36.   lcd.createChar(6, cross);
    
37.   lcd.createChar(7, retarrow);
    
38.   lcd.home();
    
39.   
    
40.   lcd.setCursor(0, 0);
    
41.   for(int i = 0;i < 20; i++)  lcd.printByte(6);
    
42.   lcd.setCursor(0, 1);
    
43.   lcd.printByte(6);
    
44.   lcd.print("   Hello world    ");
    
45.   lcd.printByte(6);
    
46.   lcd.setCursor(0, 2);
    
47.   lcd.printByte(6);
    
48.   lcd.print("  i ");
    
49.   lcd.printByte(3);
    
50.   lcd.print(" arduinos!   ");
    
51.   lcd.printByte(6);
    
52.   lcd.setCursor(0, 3);
    
53.   for(int i = 0;i < 20; i++)  lcd.printByte(6);
    
54. //  lcd.clear();
    
55. 
    
56. }
    
57. 
    
58. void loop()
    
59. {
    
60. 
    
61. }
    

复制代码

Damn_intuition

loop里写代码，setup的只执行一次，效果应该是一闪而过

uvvvvw

毛毛毛毛毛 发表于 2013-3-15 13:26

试试将
lcd.init();
改为
lcd.init();
delay(200);
lcd.init();

zhangsiyan12134

哟~少年……试试这个库吧……有的屏的转接板走线有变化，需要特殊的库……

毛毛毛毛毛

谢谢各位，我的问题解决了。
LiquidCrystal_I2C lcd(0x20,20,4);
才是正解