Stone的专栏

<br /><br /><br />最简单的例子：<br /> <br />void setup() <br />{ <br />  Serial.begin(9600); // 打开串口，设置波特率为9600 bps<br />}<br />void loop() <br />{<br />      int val;<br />      val=analogRead(5);//传感器接到模拟口5，数值根据自己的需要可变<br />      Serial.println(val,DEC);//从串口发

<br /> <br /><br />Pulse Width Modulation, or PWM, is a technique for getting analog results with digital means. Digital control is used to create a square wave, a signal switched between on and off. This on-off pattern can simulate voltages in between ful

analogRead()DescriptionReads the value from the specified analog pin. The Arduino board contains a 6 channel (8 channels on the Mini and Nano, 16 on the Mega), 10-bit analog to digital converter. This means that it will map input voltages between 0 and 5 v

analogWrite()DescriptionWrites an analog value (PWM wave) to a pin. Can be used to light a LED at varying brightnesses or drive a motor at various speeds. After a call to analogWrite(), the pin will generate a steady square wave of the specified duty cycle

FadingDemonstrates the use of the analogWrite() function in fading an LED off and on. AnalogWrite uses pulse width modulation (PWM), turning a digital pin on and off very quickly, to create a fading effect. Hardware RequiredArduino boardBreadboarda LEDa 22

<br /><br />analogWrite(pin, value)<br /> <br /> <br /><br /> 先按照下图连接号电路<br />这次就用Arduino和一组三色灯（红、黄、绿）来实际应用一下PWM吧，先先观察一下Arduino板子，共有六个PWM接口，他们分别是数字接口3、5、6、9、10、11 ,方便起见我们使用9、10、11这三个连续的PWM接口。在编写程序的过程中，我们会用到模拟写入analogWrite(PWM接口，模拟值函数，对于模拟写入analogWrite()函数，

<br />Fritzing是德国波茨坦应用科学大学（University of Applied Sciences Potsdam）交互设计实验室的研究员们开发的软件。它是个电子设计自动化软件，支持设计师，艺术家，研究人员和爱好者参加从物理原型到进一步实现其产品。还支持用户记录Arduino和其他电子为基础的原型，与他人分享，在教室里教电子，并建立一个生产型印刷电路板的布局。<br /> <br />官网地址：http://fritzing.org/

按照图片所示进行连接：代码：#define LED_GREEN 9//定义与绿灯连接的引脚#define LED_RED 10//定义与红灯连接的引脚int brightness = 0;    // how bright the LED isint fadeAmount = 5;    // how many points to fade the LED byvoid setup(){  pinMode(LED_GREEN,OUTPUT);  pinMode(LED_RED,OUTPUT);  Seria