attachInterrupt

#include <Servo.h>

const int SERVO = 10;
Servo servo;
const int buttonPin = 2;

int servo_state = 30;
bool servo_state_changed = false;

void buttonPressed(){
  servo_state = (servo_state == 30)?150:30;
  servo_state_changed = true;
}

void setup(){
  pinMode(buttonPin, INPUT);
  attachInterrupt(digitalPinToInterrupt(buttonPin), buttonPressed, RISING);
  servo.attach(SERVO);
  servo.write(0);
  delay(1000);
}

void loop(){
  if(servo_state_changed){
    servo_state_changed = false;
    servo.write(servo_state);
  }
}


// 버튼 누를 때마다 서보의 각도가 90도씩 번갈아 움직임​

const int ledPin = 13;
const int buttonPin = 2;

int led_state = LOW;
bool led_state_changed = false;

void buttonPressed(){
  led_state = (led_state == LOW) ? HIGH : LOW;
  led_state_changed = true;
}

void setup(){
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT);
  attachInterrupt(digitalPinToInterrupt(buttonPin), buttonPressed, RISING);
}

void loop(){
  if (led_state_changed){
    led_state_changed = false;
    digitalWrite(ledPin, led_state);
  }
}

// 버튼을 누르면 켜진 상태가 지속, 다시 누르면 꺼진 상태가 지속

 

rising edge triggered

falling edge triggered

 

level triggered (HIGH, LOW)

edge triggered(RISING, FALLING)

 

const int ACTIVE_BUZZER = 10;
const int buttonPin = 2;

int buzzer_state = LOW;
bool buzzer_state_changed = false;

void buttonPressed(){
  buzzer_state = (buzzer_state == LOW)?HIGH : LOW;
  buzzer_state_changed = true;
}

void setup(){
  pinMode(ACTIVE_BUZZER, OUTPUT);
  pinMode(buttonPin, INPUT);
  attachInterrupt(digitalPinToInterrupt(buttonPin), buttonPressed, RISING);
}

void loop(){
  if (buzzer_state_changed){
    buzzer_state_changed = false;
    digitalWrite(ACTIVE_BUZZER, buzzer_state);
  }
}