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[on:]

I've made simple circuit to master Arduino interrupts. I wrote also a simple program keeping track of how many times button has been pressed. For unknown reasons Arduino seems to call INT0 interrupt even on change on digital pin 3. What am I doing wrong?

Here's code, and circuit:

Code:

volatile int count0 = 0;

void setup()
{
  Serial.begin(9600);
 
  // Set input and pullups
  pinMode(2, INPUT);
  digitalWrite(2, HIGH);
  pinMode(3, INPUT);
  digitalWrite(3, HIGH);
 
  // Set INT0 interrupt:
  attachInterrupt(0, interrupt0, FALLING);
}

void loop()
{
  Serial.println(count0);
  Serial.println(count1);
  delay(1000);
}

void interrupt0()
{
  Serial.println("Interrupt0");
  count0++;
}

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[Reply #1 on:]

This doesn't help you but just btw this

Code:

pinMode(2, INPUT);
  digitalWrite(2, HIGH);

can be changed to this

Code:

pinMode(2,INPUT_PULLUP);