http://lifestyle201.com/wiki/index.php?action=history&feed=atom&title=PulseIn%28%29 2024-10-22T18:40:55Z 本wiki的該頁面的版本歷史 MediaWiki 1.21.2 http://lifestyle201.com/wiki/index.php?title=PulseIn()&diff=90&oldid=prev 2014-09-12T06:22:07Z

<p>以“&lt;pre style=&quot;color:blue&quot;&gt; unsigned long pulseIn (uint8_t pin, uint8_t state, unsigned long timeout) &lt;/pre&gt; 讀脈沖&lt;br&gt; 讀引腳的脈沖, 脈沖可以是 HIGH...”為內(nèi)容創(chuàng)建頁面</p> <p><b>新頁面</b></p><div>&lt;pre style=&quot;color:blue&quot;&gt;<br /> unsigned long pulseIn (uint8_t pin, uint8_t state, unsigned long timeout) <br /> &lt;/pre&gt;<br /> 讀脈沖&lt;br&gt;<br /> <br /> 讀引腳的脈沖, 脈沖可以是 HIGH 或 LOW. 如果是 HIGH, 函數(shù)將先等引腳變?yōu)楦唠娖? 然后 開始計(jì)時(shí), 一直到變?yōu)榈碗娖綖橹? 返回脈沖持續(xù)的時(shí)間長短, 單位為毫秒. 如果超時(shí)還沒有 讀到的話, 將返回0.&lt;br&gt;<br /> <br /> 參數(shù):&lt;br&gt;<br /> #pin 引腳編號<br /> #state 脈沖狀態(tài)<br /> #timeout 超時(shí)時(shí)間<br /> <br /> 下面的例子演示了統(tǒng)計(jì)高電平的繼續(xù)時(shí)間:&lt;br&gt;<br /> &lt;pre style=&quot;color:green&quot;&gt;<br /> int pin = 7;<br /> unsigned long duration;<br /> <br /> void setup()<br /> {<br /> pinMode(pin, INPUT);<br /> }<br /> <br /> void loop()<br /> {<br /> duration = pulseIn(pin, HIGH);<br /> }<br /> &lt;/pre&gt;</div>

Admin