风筝 发表于 2020-2-27 08:52
可以在库管理器或者Github下载  https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library ...

弄好了，对了，你的代码还有问题，运算超过三次就会死机

确实是库不匹配，其他的程序用可以！这个代码不知为啥匹配这个才正常不报错...

Arduino:1.5.6-r2 (Windows 8), 板："Arduino Uno"

sketch_mar06a:18: error: 'Keypad' does not name a type
sketch_mar06a:19: error: 'LiquidCrystal_I2C' does not name a type
sketch_mar06a.ino: In function 'void setup()':
sketch_mar06a:28: error: 'lcd' was not declared in this scope
sketch_mar06a.ino: In function 'void loop()':
sketch_mar06a:39: error: 'myKeypad' was not declared in this scope
sketch_mar06a:40: error: 'NO_KEY' was not declared in this scope
sketch_mar06a:45: error: 'lcd' was not declared in this scope
sketch_mar06a:50: error: 'lcd' was not declared in this scope
sketch_mar06a:53: error: 'NO_KEY' was not declared in this scope
sketch_mar06a:57: error: 'lcd' was not declared in this scope
sketch_mar06a:63: error: 'NO_KEY' was not declared in this scope
sketch_mar06a:79: error: 'lcd' was not declared in this scope
sketch_mar06a:90: error: 'NO_KEY' was not declared in this scope
sketch_mar06a.ino: In function 'void scrollDisplay()':
sketch_mar06a:100: error: 'lcd' was not declared in this scope
sketch_mar06a:110: error: 'lcd' was not declared in this scope
sketch_mar06a.ino: In function 'void clr()':
sketch_mar06a:118: error: 'lcd' was not declared in this scope

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欸。。。。我的会出现这样的错误

求助 为啥试好多次还是库出问题

lcd.begin();
这句错误

请问楼主，Fritzing中没有您图中的4×4键盘和I2C模块，怎么做出像您那样的Fritzing电路图呢

已经上传成功了为什么显示屏没有显示任何东西呀，求救

小绿 发表于 2021-12-9 20:29
已经上传成功了为什么显示屏没有显示任何东西呀，求救

已解决

你好 我这里出现no matching function call to "liquidcrystal_I2C::begin()"是什么问题呀 库我也更新了 这里是未命名成功吗

15357649052 发表于 2021-6-5 18:53
lcd.begin();
这句错误

我也是 你解决了吗