arduino按钮不工作

Question

所以我有一个程序，它必须通过按一下按钮来打开/关闭灯，但它就是不起作用。它不会在控制台中显示任何内容，灯也不会熄灭/打开。它只会保持一段时间，然后关闭

const int buttonPin = 3;     // the number of the pushbutton pin
const int ledPin =  13;      // the number of the LED pin
int incoming = 0;

void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT);
  attachInterrupt(0, blink, CHANGE);

}

void blink()
{
  digitalWrite(ledPin, !digitalRead(buttonPin));
  if (!digitalRead(buttonPin)) {
    Serial.println("LED lights");
  } else {
    Serial.println("LED is off");
  }
}


void loop() {

  if (Serial.available() > 0) { 
    incoming = Serial.read() - 48;
    analogWrite(ledPin, incoming * 29);
    Serial.print("LED brightness = ");    
    Serial.println(incoming*29);

  }
}

Answer 1

在您根据注释使用的Arduino Uno中，中断0根据docs负责引脚编号2。但是您使用的是引脚3作为输入，因此根据同一页面，它应该使用中断1。

Answer 2

为什么要使用中断？我建议使用一个简单的状态模式，通过比较前面的按钮状态，如http://www.multiwingspan.co.uk中的code example所示

int ledPin = 13;
int buttonPin = 3;
int lastButtonState = HIGH;
int ledState = HIGH;

void setup()
{
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT);
}

void loop()
{
  // read from the button pin
  int buttonState = digitalRead(buttonPin);
  // if the button is not in the same state as the last reading
  if (buttonState==LOW && buttonState!=lastButtonState)
  {
    // change the LED state
    if (ledState==HIGH)
    {
      ledState = LOW;
    }
    else
    {
      ledState = HIGH;
    }
  }
  digitalWrite(ledPin, ledState);
  // store the current button state
  lastButtonState = buttonState;
  // add a delay to avoid multiple presses being registered
  delay(20);
}