If statement 无法使开关改变LED颜色，无论开关是否按下，只要循环所有颜色即可

我正在通过本教程学习如何在Arduino上做一些基本的事情。我想写一个程序，让我能够控制一个3色LED开关，每次按下开关，我希望LED从红色变为绿色变为蓝色。据我所知，循环方法应该一次又一次地运行，以测试开关是否按下。如果已按下，则应增加一个计数器，直到达到2（蓝色）且计数器复位。它的颜色从红色变为绿色再变为蓝色，但当我按下开关时，它只是在它们之间循环，就好像开关总是被按下一样。我的代码如下

int ledPin = 13;    // LED is connected to digital pin 13
int redPin = 11;    // R petal on RGB LED module connected to digital pin 11
int greenPin = 9;   // G petal on RGB LED module connected to digital pin 9
int bluePin = 10;   // B petal on RGB LED module connected to digital pin 10
int switchValue;
int switchPin = 2;
int count = 0;          
int red = 255;          //red value, initially set at 255
int blue = 0;          //blue value, initially set at 0

void setup()     
{    
  pinMode(ledPin, OUTPUT);  // sets the ledPin to be an output
  pinMode(redPin, OUTPUT);  // sets the redPin to be an output
  pinMode(greenPin, OUTPUT);    // sets the greenPin to be an output
  pinMode(bluePin, OUTPUT); // sets the bluePin to be an output
  //redtoblue();
}    

void loop() // run over and over again
{    
  if(switchValue == LOW){  
    if (count == 0){
      color(255, 0, 0); // turn the RGB LED red
      delay(1000);  // delay for 1 second
      count += 1;    //increment the count
    }
    else if (count == 1){
      color(0,255, 0);  // turn the RGB LED green
      delay(1000);  // delay for 1 second
      count += 1;    //increment the count
    }
    else if (count == 2){
      color(0, 0, 255); // turn the RGB LED blue
      delay(1000);  // delay for 1 second
      count = 0;    // set the count back to 0
    }
  }

}
void color (unsigned char red, unsigned char green, unsigned char blue)     // the color generating function
{    
  analogWrite(redPin, 255-red);  
  analogWrite(bluePin, 255-blue);
  analogWrite(greenPin, 255-green);
}    

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您没有读取开关引脚的值，也没有将引脚设置为输入

所以SwitchValue总是很低，而您的条件总是真实的。所以它只是循环