#include<LiquidCrystal.h> // Including lcd display library
LiquidCrystal lcd (7,8,9,10,11,12); // Define LCD display pins RS,E,D4,D5,D6,D7
volatile int output = LOW;
int i = 0;
void setup()
{
lcd.begin(16,2); // setting LCD as 16x2 type
lcd.setCursor(0,0);
lcd.print("CIRCUITDIGEST");
lcd.setCursor(0,1);
lcd.print("ArduinoInterrupt");
delay(3000);
lcd.clear();

pinMode(13,OUTPUT);
attachInterrupt(digitalPinToInterrupt(2),buttonPressed1,RISING); // function for creating external interrupts at pin2 on Rising (LOW to HIGH)
attachInterrupt(digitalPinToInterrupt(3),buttonPressed2,RISING); // function for creating external interrupts at pin3 on Rising (LOW to HIGH)

}
void loop()
{
lcd.clear();
lcd.print("COUNTER:");
lcd.print(i);

++i;

delay(1000);
digitalWrite(13,output); //Turns LED ON or OFF depending upon output value
}
void buttonPressed1() //ISR function excutes when pushbutton at pinD2 is pressed
{
output = LOW; //Change Output value to LOW
lcd.setCursor(0,1);
lcd.print("Interrupt 1");
}
void buttonPressed2() //ISR function excutes when pushbutton at pinD3 is pressed
{
output = HIGH; //Change Output value to HIGH
lcd.setCursor(0,1);
lcd.print("Interrupt2");
}