44 lines
1.9 KiB
C++
Executable File
44 lines
1.9 KiB
C++
Executable File
/*
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25 模拟输出1 - analogWrite
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太极创客
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www.taichi-maker.com
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此程序用于太极创客<<零基础入门学用Arduino教程>>
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25 模拟输出1 - analogWrite
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演示如何通过两个按键开关通过analogWrite指令
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进行模拟输出操作。具体电路和其它信息请参考
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太极创客网站本教程相关页面。
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2017-04-28
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*/
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boolean pushButton1; // 创建布尔型变量用来存储按键开关1的电平状态
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boolean pushButton2; // 创建布尔型变量用来存储按键开关2的电平状态
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int ledPin = 9; //LED引脚号
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int brightness = 128; //LED亮度参数
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void setup() {
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// put your setup code here, to run once:
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pinMode(2, INPUT_PULLUP); //将引脚2设置为输入上拉模式
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pinMode(8, INPUT_PULLUP); //将引脚8设置为输入上拉模式
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pinMode(ledPin, OUTPUT); //将LED引脚设置为输出模式
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Serial.begin(9600); //启动串口通讯
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}
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void loop() {
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// put your main code here, to run repeatedly:
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pushButton1 = digitalRead(2); //读取引脚2电平状态并将其赋值给布尔变量
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pushButton2 = digitalRead(8); //读取引脚8电平状态并将其赋值给布尔变量
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if (!pushButton1 && brightness > 0){ // 当按下按键开关1并且LED亮度参数大于0
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brightness--; // 减低LED亮度参数
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//（brightness-- 相当于 brightness = brightness - 1;）
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} else if (!pushButton2 && brightness < 255) { //当按下按键开关2并且LED亮度参数小于255
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brightness++; //增加LED亮度参数
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//（brightness++ 相当于 brightness = brightness + 1;）
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}
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analogWrite(ledPin, brightness); //模拟输出控制LED亮度
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Serial.println(brightness); //将LED亮度参数显示在串口监视器上
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delay(10);
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}
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