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		<id>http:///https//wiki.microduino.cn/index.php?action=history&amp;feed=atom&amp;title=Microduino-Buzzer</id>
		<title>Microduino-Buzzer - 版本历史</title>
		<link rel="self" type="application/atom+xml" href="http:///https//wiki.microduino.cn/index.php?action=history&amp;feed=atom&amp;title=Microduino-Buzzer"/>
		<link rel="alternate" type="text/html" href="https//wiki.microduino.cn/index.php?title=Microduino-Buzzer&amp;action=history"/>
		<updated>2026-04-29T18:10:52Z</updated>
		<subtitle>本wiki的该页面的版本历史</subtitle>
		<generator>MediaWiki 1.30.0</generator>

	<entry>
		<id>https//wiki.microduino.cn/index.php?title=Microduino-Buzzer&amp;diff=11203&amp;oldid=prev</id>
		<title>2015年11月1日 (日) 04:39 1304410487@qq.com</title>
		<link rel="alternate" type="text/html" href="https//wiki.microduino.cn/index.php?title=Microduino-Buzzer&amp;diff=11203&amp;oldid=prev"/>
				<updated>2015-11-01T04:39:16Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;zh-CN&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;←上一版本&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;2015年11月1日 (日) 04:39的版本&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l4&quot; &gt;第4行：&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;第4行：&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;|&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;|&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[File: Microduino-BUZZER.jpg|400px|thumb|right| Microduino-Buzzer]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[File: Microduino-BUZZER.jpg|400px|thumb|right| Microduino-Buzzer]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;Microduino-Buzzer是无源蜂鸣器，和电磁扬声器一样，需要高低变化不同频率的电压才能发声。频率越高则音调越高。&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Microduino-Buzzer is a passive buzzer. Like a magnetic speaker, it needs voltage with different frequency so that it can make sound accordingly.&amp;#160; The pitch becomes louder when the frequency gets higher.&amp;#160; &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Microduino-Buzzer is a passive buzzer. Like a magnetic speaker, it needs voltage with different frequency so that it can make sound accordingly.&amp;#160; The pitch becomes louder when the frequency gets higher.&amp;#160; &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>1304410487@qq.com</name></author>	</entry>

	<entry>
		<id>https//wiki.microduino.cn/index.php?title=Microduino-Buzzer&amp;diff=11202&amp;oldid=prev</id>
		<title>2015年11月1日 (日) 04:39 1304410487@qq.com</title>
		<link rel="alternate" type="text/html" href="https//wiki.microduino.cn/index.php?title=Microduino-Buzzer&amp;diff=11202&amp;oldid=prev"/>
				<updated>2015-11-01T04:39:01Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;zh-CN&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;←上一版本&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;2015年11月1日 (日) 04:39的版本&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l4&quot; &gt;第4行：&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;第4行：&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;|&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;|&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[File: Microduino-BUZZER.jpg|400px|thumb|right| Microduino-Buzzer]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[File: Microduino-BUZZER.jpg|400px|thumb|right| Microduino-Buzzer]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;Microduino-Buzzer是无源蜂鸣器，和电磁扬声器一样，需要高低变化不同频率的电压才能发声。频率越高则音调越高。&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Microduino-Buzzer is passive &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;just like &lt;/del&gt;a magnetic speaker&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;. It &lt;/del&gt;needs voltage with different frequency &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;and thus &lt;/del&gt;can make sound accordingly.&amp;#160; The &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;sound &lt;/del&gt;becomes louder when the frequency gets higher.&amp;#160; &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Microduino-Buzzer is &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;a &lt;/ins&gt;passive &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;buzzer. Like &lt;/ins&gt;a magnetic speaker&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;, it &lt;/ins&gt;needs voltage with different frequency &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;so that it &lt;/ins&gt;can make sound accordingly.&amp;#160; The &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;pitch &lt;/ins&gt;becomes louder when the frequency gets higher.&amp;#160; &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>1304410487@qq.com</name></author>	</entry>

	<entry>
		<id>https//wiki.microduino.cn/index.php?title=Microduino-Buzzer&amp;diff=11160&amp;oldid=prev</id>
		<title>2015年10月30日 (五) 07:48 Yanglibin@microduino.cc</title>
		<link rel="alternate" type="text/html" href="https//wiki.microduino.cn/index.php?title=Microduino-Buzzer&amp;diff=11160&amp;oldid=prev"/>
				<updated>2015-10-30T07:48:38Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;zh-CN&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;←上一版本&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;2015年10月30日 (五) 07:48的版本&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l1&quot; &gt;第1行：&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;第1行：&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{Language|Microduino-Buzzer }}&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{Language|Microduino-Buzzer}}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{| style=&amp;quot;width: 800px;&amp;quot;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{| style=&amp;quot;width: 800px;&amp;quot;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;|-&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;|-&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Yanglibin@microduino.cc</name></author>	</entry>

	<entry>
		<id>https//wiki.microduino.cn/index.php?title=Microduino-Buzzer&amp;diff=10959&amp;oldid=prev</id>
		<title>1304410487@qq.com：Created page with &quot;{{Language|Microduino-Buzzer }} {| style=&quot;width: 800px;&quot; |- |  Microduino-Buzzer  Microduino-Buzzer is passive just like a ma...&quot;</title>
		<link rel="alternate" type="text/html" href="https//wiki.microduino.cn/index.php?title=Microduino-Buzzer&amp;diff=10959&amp;oldid=prev"/>
				<updated>2015-10-25T03:16:45Z</updated>
		
		<summary type="html">&lt;p&gt;Created page with &amp;quot;{{Language|Microduino-Buzzer }} {| style=&amp;quot;width: 800px;&amp;quot; |- | &lt;a href=&quot;/index.php/%E6%96%87%E4%BB%B6:Microduino-BUZZER.jpg&quot; title=&quot;文件:Microduino-BUZZER.jpg&quot;&gt;400px|thumb|right| Microduino-Buzzer&lt;/a&gt;  Microduino-Buzzer is passive just like a ma...&amp;quot;&lt;/p&gt;
&lt;p&gt;&lt;b&gt;新页面&lt;/b&gt;&lt;/p&gt;&lt;div&gt;{{Language|Microduino-Buzzer }}&lt;br /&gt;
{| style=&amp;quot;width: 800px;&amp;quot;&lt;br /&gt;
|-&lt;br /&gt;
|&lt;br /&gt;
[[File: Microduino-BUZZER.jpg|400px|thumb|right| Microduino-Buzzer]]&lt;br /&gt;
&lt;br /&gt;
Microduino-Buzzer is passive just like a magnetic speaker. It needs voltage with different frequency and thus can make sound accordingly.  The sound becomes louder when the frequency gets higher.  &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
==Feature==&lt;br /&gt;
*Controllable sound frequency (eg: You can achieve the effect of piano spectrum with it. )&lt;br /&gt;
*Small size and beautiful &lt;br /&gt;
&lt;br /&gt;
==Specification==&lt;br /&gt;
*Operation voltage—3.3V~5V; &lt;br /&gt;
*1.27mm pitch and 4Pin interface; &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
[[File: Microduino-Buzzer_rule1.jpg|600px|thumb|center]]&lt;br /&gt;
&lt;br /&gt;
==Document==&lt;br /&gt;
&lt;br /&gt;
*Schematic：'''[[File: Microduino_ Buzzer.Zip]]'''&lt;br /&gt;
&lt;br /&gt;
==Development==&lt;br /&gt;
It can be used to make various kinds of sound through the buzzer.  &lt;br /&gt;
==Application==&lt;br /&gt;
*Hardware Needed: [[Microduino-Core]], [[Microduino-USBTTL]], [[Microduino-Sensorhub]], several dupont lines and USB cable;  &lt;br /&gt;
*Software:&lt;br /&gt;
**Make sure you did build Microduino development envrionment or you need to refer to: [[Microduino Getting start]]&lt;br /&gt;
*Program&lt;br /&gt;
&amp;lt;source lang=&amp;quot;cpp&amp;quot;&amp;gt;&lt;br /&gt;
#define buzzer_pin 6&lt;br /&gt;
void setup()&lt;br /&gt;
{&lt;br /&gt;
  pinMode(buzzer_pin,OUTPUT);&lt;br /&gt;
}&lt;br /&gt;
 &lt;br /&gt;
void loop()&lt;br /&gt;
{&lt;br /&gt;
  for(int i=200;i&amp;lt;=800;i++)  //Increase the frequency from 200HZ to 800HZ circularly. &lt;br /&gt;
  {&lt;br /&gt;
    tone(buzzer_pin,i);    //Output frequency in the port. &lt;br /&gt;
&lt;br /&gt;
    delay(5);      //The frequency lasts for 5ms.  &lt;br /&gt;
  }&lt;br /&gt;
  delay(1000);     //The highest frequency lasts for 1s. &lt;br /&gt;
  for(int i=800;i&amp;gt;=200;i--)&lt;br /&gt;
  {&lt;br /&gt;
    tone(buzzer_pin,i);&lt;br /&gt;
    delay(10); //The frequency lasts 10ms.   &lt;br /&gt;
  }&lt;br /&gt;
}&lt;br /&gt;
&amp;lt;/source&amp;gt;&lt;br /&gt;
*Stack all the modules and then connect the interface on the back of BUZZER to the D6 digital port of Sensorhub. &lt;br /&gt;
&lt;br /&gt;
*Open IDE, copy the program to IDE, choose the right board, compile and download.&lt;br /&gt;
*You can hear the alarm after download. &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
==Purchase==&lt;br /&gt;
&lt;br /&gt;
==History==&lt;br /&gt;
&lt;br /&gt;
==Image==&lt;br /&gt;
&lt;br /&gt;
*Front&lt;br /&gt;
[[file: Microduino-Buzzer-F.JPG|thumb|600px|center|Microduino-Cube-Station Front]]&lt;br /&gt;
*Back&lt;br /&gt;
[[file: Microduino-Buzzer -b.JPG|thumb|600px|center|Microduino-Cube-Station Back]]&lt;br /&gt;
|}&lt;/div&gt;</summary>
		<author><name>1304410487@qq.com</name></author>	</entry>

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