arduino控制呼吸灯代码

呼吸灯、
//以下是arduino UNO通用代码
int red = 1; //蜂鸣器信号脚接D1
int PIR = 2; //人体感应传感器信号线接D2
int green=3；//
int grue=4；  //
int val = 0;  
int i;
int zen=5;
int bri=0;
void setup()
{
  pinMode(red, OUTPUT);    
  pinMode(green, OUTPUT);  
  pinMode(grue, OUTPUT);    
  pinMode(PIR, INPUT);      
 
 
}
 
void loop()
{
  val = digitalRead(PIR);  
  if(HIGH == val)//如果PIR检测到人体活动
     {
       analogWrite(1,bri);
       bri=zen+bri;
       if(bri==0 || bri==255)
       {
         zen=-zen;