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<>Arduino光敏传感器控制LED灯亮度
目标一：
通过光敏传感器，使得LED亮度根据环境亮度自动调节，环境亮度低则LED灯更亮些
光敏传感器：
光敏传感器共有四个端口：
AO：模拟信号输出
DO：TTL 开关信号输出（亮度大于设定值时DO输出低电平，反之输出高电平）
线路图：
—— 此处没有连接DO端口 ——
相关代码：
int value; //存储通过光敏传感器后电灯亮度值 void setup(){ Serial.begin(9600);
pinMode(4,OUTPUT); //4脚为输出脚 } void loop(){ value=analogRead(A0)/4;
analogWrite(4,value); }
效果图：
目标二：
使用串口监视器控制LED灯模式：
* A.夜灯模式（LED灯亮度低）
* B.阅读模式（LED灯亮度高）
* C.自适应模式（LED灯亮度自适应）
代码：
int mode; //定义模式(模式0：阅读模式 模式1：夜灯模式 模式2：自适应模式) int value; //存储通过光敏传感器后电灯亮度值
void setup(){ Serial.begin(9600); pinMode(4,OUTPUT); } void loop(){ char
LED=Serial.read(); //LED读取输入 if(LED=='A') //判断模式 mode=0; else if(LED=='B')
mode=1; else if(LED=='C') mode=2; value=analogRead(A0)/4; control(); //调用contol
} void control(){ //三种LED灯模式 if(mode==0){ analogWrite(4,255); } else
if(mode==1){ analogWrite(4,90); } else if(mode==2){ analogWrite(4,value); } }
