An AVR external interrupt example #include<avr/io.h> #include<avr/interrupt.h> // interrupt header file #include<util/delay.h> /** External Interrupt Program */ // Interrupt service Routine for INTO ISR(INT0_vect) { //_delay_ms(50); // Software Debounce delay PORTB ^= 1<<PINB0; _delay_ms(50); } int main (void) { DDRB |= 1<< PINB0 |...