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代码案例/6 Arduino基础学习/27 模拟输出 – 3 for循环/Lesson27-1/Lesson27-1.ino

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+/*
+27 模拟输出3 - for
+太极创客
+www.taichi-maker.com
+
+此程序用于太极创客<<零基础入门学用Arduino教程>> 
+27 模拟输出3 - for
+
+演示如何通过for循环语句实现LED明暗交替（呼吸灯）效果。
+
+2017-04-28
+*/
+void setup() {
+  pinMode(9, OUTPUT);      //设置9号引脚为输出模式
+  Serial.begin(9600);     //启动串口通讯
+}
+
+void loop() {
+  // LED由暗到明
+  for (int brightness = 0; brightness <= 255; brightness++){
+    analogWrite(9, brightness);   
+    Serial.println(brightness);
+    delay(10);
+  }
+  
+  // LED由明到暗  
+  for (int brightness = 255; brightness >=0 ; brightness--){
+    analogWrite(9, brightness);
+    Serial.println(brightness);
+    delay(10);
+  }
+}