PigiLike 发表于 2016-2-29 15:22:32

请问这段编程烧录后,LED为何在开关按下时无法关闭?

4接的是按钮,9接的是LED。
求大神解答!拜谢!

const int LED = 9;
int i = 0;
const int BUTTON = 4;
boolean state = 0;
int val = 0;
int oldvalue = 0;

void setup() {
pinMode(LED,OUTPUT);
pinMode(BUTTON,INPUT);
}

void loop() {
val = digitalRead(BUTTON);
if( (val == HIGH) && (oldvalue == LOW)){
    state = !state;
    delay(10);
}
oldvalue = val;

if (state ==1){
    for(i=0; i<255; i++){
      analogWrite(LED, i);
      delay(10);
    }

    for (i=255; i>0; i--){
      analogWrite(LED,i);
      delay(10);
    }
}else if(state == 0){
analogWrite(LED, 0);
}
}

dsweiliang 发表于 2016-3-1 08:41:23

不懂帮顶

PigiLike 发表于 2016-3-1 15:49:29

dsweiliang 发表于 2016-3-1 08:41
不懂帮顶

谢谢{:5_197:}{:5_197:}
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