带LED的Arduino按钮

我已经组装了一个Arduino电路，当按下按钮时，它会关闭led。我该如何编码，当我按下它时，它会打开并保持打开状态，并且只会在再次按下时关闭？任何帮助都将不胜感激

我目前的代码是：

  int ledred = 12;
  int ledgreen = 8;
  int BUTTON = 4;
  int speakerPin = 1;

  void setup() {
   // initialize the digital pin as an output.
   Serial.begin(9600);
   pinMode(ledgreen, OUTPUT);
   pinMode(ledred, OUTPUT);
   pinMode(BUTTON,INPUT);
  }

void loop() {
 if(digitalRead(BUTTON) == HIGH){
  digitalWrite(ledred,HIGH);
  digitalWrite(ledgreen,HIGH);
   }else
   {
    digitalWrite(ledred,LOW);
    digitalWrite(ledgreen,LOW);
   }
  }

---

如果您只想这样做，您可以使用其中一个中断引脚并观察

上升

（或

下降

）事件

类似于：

注意，你可能还需要一些

---

此外，您不需要使用中断，但需要一些边缘检测算法。这些都在上面的文章中得到了很好的解释。我个人更喜欢这些，因为UNO板上的中断插脚非常珍贵，不能用于简单的按钮按压…：o）

除了第一句之外，这似乎是个不错的答案。“我不明白观察上升或下降的信号会如何告诉你这是不是一个新的按钮按下了。@AdrianMcCarthy，你的意思是因为反弹？因为我确信我已经在按钮上使用了中断。只是因为反弹，它没有走那么远。如果有一个理想的按钮（或硬件取消公告），它应该可以正常工作。请为插入的代码添加说明，以便更好地指导提问者！

const byte ledPin = 13;
const byte interruptPin = 2;
volatile byte state = LOW;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(interruptPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(interruptPin), blink, RISING);
}

void loop() {
  digitalWrite(ledPin, state);
}

void blink() {
  state = !state;
}

/*
  Debounce

  Each time the input pin goes from LOW to HIGH (e.g. because of a push-button
  press), the output pin is toggled from LOW to HIGH or HIGH to LOW. There's a
  minimum delay between toggles to debounce the circuit (i.e. to ignore noise).

  The circuit:
  - LED attached from pin 13 to ground
  - pushbutton attached from pin 2 to +5V
  - 10 kilohm resistor attached from pin 2 to ground

  - Note: On most Arduino boards, there is already an LED on the board connected
    to pin 13, so you don't need any extra components for this example.

  created 21 Nov 2006
  by David A. Mellis
  modified 30 Aug 2011
  by Limor Fried
  modified 28 Dec 2012
  by Mike Walters
  modified 30 Aug 2016
  by Arturo Guadalupi

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/Debounce
*/

// constants won't change. They're used here to set pin numbers:
const int buttonPin = 2;    // the number of the pushbutton pin
const int ledPin = 13;      // the number of the LED pin

// Variables will change:
int ledState = HIGH;         // the current state of the output pin
int buttonState;             // the current reading from the input pin
int lastButtonState = LOW;   // the previous reading from the input pin

// the following variables are unsigned longs because the time, measured in
// milliseconds, will quickly become a bigger number than can be stored in an int.
unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers

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

  // set initial LED state
  digitalWrite(ledPin, ledState);
}

void loop() {
  // read the state of the switch into a local variable:
  int reading = digitalRead(buttonPin);

  // check to see if you just pressed the button
  // (i.e. the input went from LOW to HIGH), and you've waited long enough
  // since the last press to ignore any noise:

  // If the switch changed, due to noise or pressing:
  if (reading != lastButtonState) {
    // reset the debouncing timer
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    // whatever the reading is at, it's been there for longer than the debounce
    // delay, so take it as the actual current state:

    // if the button state has changed:
    if (reading != buttonState) {
      buttonState = reading;

      // only toggle the LED if the new button state is HIGH
      if (buttonState == HIGH) {
        ledState = !ledState;
      }
    }
  }

  // set the LED:
  digitalWrite(ledPin, ledState);

  // save the reading. Next time through the loop, it'll be the lastButtonState:
  lastButtonState = reading;
}