Best method to trigger only one event when a button is pressed?

General
14

The solution suggested by @nrobinson2000 works perfectly, when I don’t have events like, publish to the particle cloud / writing data to EEPROM in the loop function.

As I have to publish data to cloud, save data to EEPROM, this solution becomes unreliable.

I have started using the below code suggested by @BulldogLowell, it still doesn’t remove the bouncing of the interrupt fully, as it still registers 2 to 3 interrupts for each button press.

Could someone please guide me how I could resolve interrupt bouncing issue ?

Here is a the MicroSwitch that I am using along with my particle Electron.

int button = D2;
void press(void);
int buttonState=1;
volatile bool flag = false;

void setup() 
{
    Serial.begin(9600);
    //while(!Serial.available()) SPARK_WLAN_Loop();
    Serial.println("Interrupt Test");
    pinMode(button, INPUT_PULLUP);
    attachInterrupt(button, press, FALLING);
}

void loop() 
{
  if (flag == true)
  {
      Serial.println("Key Pressed");
      flag = false;
  }
}

void press()
{
    //Serial.println("switched now");
  static unsigned long last_interrupt_time = 0;
  unsigned long interrupt_time = millis();
  if (interrupt_time - last_interrupt_time > 50)  // debounce time = 50milliseconds
  {
    flag = true;
  }
  last_interrupt_time = interrupt_time;
}