按顺序按4，5，6开关导致关闭rgb的代码不起作用

Question

我在做感光报警器。当距离低于5cm以上的notes[] 5次，压电扬声器关闭。我想通过按4，5，6开关顺序关闭led rgb。按4、5、6开关顺序关闭led rgb的代码不起作用。怎么了？下面是一个代码。

int pins[]={4,5,6};
int melody[]={262,294,330};
int notes[]={392,392,440,440,392,392,330};
int b=0,r=0,g=0;

void setup() {
  // put your setup code here, to run once:
 randomSeed(analogRead(A0));
 for(int i=0;i<3;i++){
   pinMode(pins[i],INPUT);
 }
}
int c=0;
int value1=digitalRead(4);
int value2=digitalRead(5);
int value3=digitalRead(6);

void loop() {
  // put your main code here, to run repeatedly:
  int vin=analogRead(A0);
  if (c>5){
    //  b=0,r=0,g=0;
    noTone(8);
    //analogWrite(11,b);
    //analogWrite(10,r);
    //analogWrite(9,g);
   // return;
  }
  if(digitalRead(0)==HIGH){ 
    if(digitalRead(1)==HIGH){
      if(digitalRead(2)==HIGH){
       b=0,r=0,g=0;
       noTone(8);
       analogWrite(11,b);
       analogWrite(10,r);
       analogWrite(9,g);
       return;
      }
    }
  }
  if(vin>800){
    for(int i=0; i<7 ;i++){
      tone(8,notes[i],100);
      delay(200);
      noTone(8);
      analogWrite(11,random(256));
      analogWrite(10,random(256));
      analogWrite(9,random(256));
      delay(200);
    }
  }
  long duration = pulseIn(3,HIGH);
  long distance=duration/58.2;
  if(duration == 0){
    return;
  }
  if (distance<5){
    c++;
  }

}

通过依次按4、5、6开关关闭led rgb的代码，rgb是关闭的。

Answer 1

这里有一些错误，但是让我们关注一下你们的4,5,6序列。在循环中，您需要跟踪是否按下了按钮以及按了什么按钮。您想在这里使用的是一个case/开关设置。https://www.arduino.cc/reference/en/language/structure/control-structure/switchcase/

每次在循环过程中，您都会检查是否按下了按钮。然后翻查你的案子。我会这样做：(伪代码)

int state = 0; //0=no buttons, 1=4 pressed, 2=4,5 pressed, 3= 4,5,6 pressed

switch(pressedButton) {
case 4: 
 if(state == 0){
  state = 1;
 } else state = 0; 

case 5:
 if(state == 1) {
  state = 2;
 } else state = 0;

case 6:
 if(state == 2) {
  state = 3;
 } else state = 0;
}
if(state == 3) {
 //turn off LED
 state = 0;
}