:::

5. PWM

高速切換高、低電位(頻率高於 30Hz),數位訊號將能模擬類比 電壓高低變化的效果。
在數位系統上「模擬」類比輸出 的方式,稱為脈寬調變(Pulse Width Modulation,簡稱PWM )。

 

輸出PWM訊號的analogWrite( )函式

analogWrite( )函式功用是輸出脈波調變信號(Pulse Width Modulation,簡記 PWM)至指定接腳,頻率大約是 500Hz,PWM 信號可以用來在控制 LED 的亮度或 是直流馬達的轉速,在使用 analogWrite( )函式輸出 PWM 信號時,不需要先使用 pinMode( )函式去設定指定接腳為輸出模式。

analogWrite( )函式有 pin 及 value 兩個 參數必須設定,pin 參數設定 PWM 信號輸出腳,大多數的 Arduino 板使用 3、5、6、 9、10 和 11 等接腳輸出 PWM 信號,value 參數設定 PWM 信號的脈波寬度,其值為 0~255

 


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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
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資料庫語法
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0.000177 - 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
0.000144 - 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
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總計: 57
區塊
搜尋: 沒有快取
總計: 1
額外資訊
包含檔案: 204 檔案
使用記憶體: 6983592 bytes
計時
XOOPS 使用 0.143 秒來載入。
XOOPS Boot 使用 0.029 秒來載入。
Module init 使用 0.008 秒來載入。
XOOPS output init 使用 0.047 秒來載入。
Module display 使用 0.032 秒來載入。
Page rendering 使用 0.026 秒來載入。