:::

7-3 LCD特殊字元

一、write( )函式

write( )函式的功能是將字元寫入 LCD 中,有一個參數 data 必須設定,data 參數 是所要寫入 LCD 中的字元,write( )函式會傳回所寫入的位元組總數。在使用 write( ) 函式之前,必須先使用 LiquidCrystal( )函式宣告一個 LiquidCrystal 資料型態的物件。
 
格式: write(data)  
範例:

  include <LiquidCrystal.h>    //使用LiquidCrystal函式庫。
  LiquidCrystal lcd(12, 11, 10, 5, 4, 3, 2);//宣告 lcd 變數。 
  lcd.write("hello, world!");     //寫入字元"hello, world!"。

 

二、LCM字形碼

 

 

三、顯示範例

顯示25℃

#include <Wire.h>  // Arduino IDE 內建
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);

const byte degree=25;
const byte degreeSymbol=B11011111;
void setup() 
{
  lcd.begin(16,2); 

}   
void loop() 
{
  lcd.setCursor(0,0);
  lcd.print(degree);  
  lcd.write(degreeSymbol);  
  lcd.print("C");
}

 

四、練習

1.設計 Arduino 程式,控制 LCD 顯示 " π=180° "。

2.設計 Arduino 程式,控制 LCD 顯示 " 10÷2=5 "。 


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錯誤訊息
未知: Array and string offset access syntax with curly braces is deprecated 在檔案中的第 /include/functions.encoding.php 列 40
未知: Array and string offset access syntax with curly braces is deprecated 在檔案中的第 /include/functions.encoding.php 列 40
未知: Array and string offset access syntax with curly braces is deprecated 在檔案中的第 /include/functions.encoding.php 列 73
未知: Function get_magic_quotes_gpc() is deprecated 在檔案中的第 /class/libraries/vendor/xoops/xmf/src/Request.php 列 505
未知: Function get_magic_quotes_gpc() is deprecated 在檔案中的第 /class/libraries/vendor/xoops/xmf/src/Request.php 列 119
未知: Function get_magic_quotes_gpc() is deprecated 在檔案中的第 /class/libraries/vendor/xoops/xmf/src/Request.php 列 505
未知: Function get_magic_quotes_gpc() is deprecated 在檔案中的第 /class/libraries/vendor/xoops/xmf/src/Request.php 列 119
未知: Function get_magic_quotes_gpc() is deprecated 在檔案中的第 /class/libraries/vendor/xoops/xmf/src/Request.php 列 119
未知: Function get_magic_quotes_gpc() is deprecated 在檔案中的第 /class/libraries/vendor/xoops/xmf/src/Request.php 列 119
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
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通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
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通知: Undefined variable: disabled 在檔案中的第 /modules/tad_book3/function.php 列 818
通知: Undefined index: bootstrap 在檔案中的第 /modules/tadtools/preloads/core.php 列 68
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資料庫語法
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0.003877 - update tad_book3_docs set `count` = `count`+1 where tbdsn='286'
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0.001857 - select tbdsn,title,content,category,page,paragraph,sort,enable,uid,from_tbdsn from tad_book3_docs where tbsn='16' and `enable`='1' order by category,page,paragraph,sort
0.001196 - select tbdsn,title,category,page,paragraph,sort from tad_book3_docs where tbsn='16' and (`content` != '' or `from_tbdsn` != 0) and enable='1' order by category,page,paragraph,sort
0.000385 - SELECT * FROM modules WHERE dirname = 'tadtools'
0.000518 - SELECT * FROM config WHERE (`conf_modid` = '4') ORDER BY conf_order ASC
0.000269 - select mid from modules where dirname='tad_book3'
0.000478 - desc `tad_book3_data_center` `sort`
0.000274 - select `col_sn`,`data_name`,`data_sort`, `data_value` from `tad_book3_data_center` where `mid`= '9' and `col_name`='video_tbdsn_date' and `col_sn`='286' order by `sort` , `data_sort`
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0.000319 - select conf_value from config where conf_name ='allow_register'
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0.000329 - select conf_value from config where conf_title ='_MD_AM_DEBUGMODE'
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0.000188 - select `menuid`, `itemname`, `itemurl`, `target`, `icon`, `link_cate_name`, `link_cate_sn`, `read_group` from tad_themes_menu where of_level='14' and status='1' order by position
0.000168 - select `menuid`, `itemname`, `itemurl`, `target`, `icon`, `link_cate_name`, `link_cate_sn`, `read_group` from tad_themes_menu where of_level='15' and status='1' order by position
0.000160 - select `menuid`, `itemname`, `itemurl`, `target`, `icon`, `link_cate_name`, `link_cate_sn`, `read_group` from tad_themes_menu where of_level='17' and status='1' order by position
0.000181 - select `menuid`, `itemname`, `itemurl`, `target`, `icon`, `link_cate_name`, `link_cate_sn`, `read_group` from tad_themes_menu where of_level='16' and status='1' order by position
0.000160 - select `menuid`, `itemname`, `itemurl`, `target`, `icon`, `link_cate_name`, `link_cate_sn`, `read_group` from tad_themes_menu where of_level='18' and status='1' order by position
0.000478 - select a.* from tad_themes_files_center as a left join tad_themes as b on a.col_sn=b.theme_id where a.`col_name`='slide' and b.`theme_name`='school2015'
0.000479 - SELECT * FROM modules WHERE dirname = 'tad_login'
0.000466 - SELECT * FROM config WHERE (`conf_modid` = '14') ORDER BY conf_order ASC
總計: 57
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額外資訊
包含檔案: 204 檔案
使用記憶體: 6983896 bytes
計時
XOOPS 使用 0.159 秒來載入。
XOOPS Boot 使用 0.033 秒來載入。
Module init 使用 0.012 秒來載入。
XOOPS output init 使用 0.045 秒來載入。
Module display 使用 0.035 秒來載入。
Page rendering 使用 0.032 秒來載入。