03 Experiment

Controlling ON/OFF of an LED using switch

Source and description

http://sincgrid.in/avr-tutorials/avr-tutorial-experiment-3/

http://sincgrid.in/avr-tutorials/avr-tutorial-experiment-3/

// this code sets PD2 to an input with a pull-up disabled
#include <avr/io.h>
int main(void)
{
    DDRD &= ~(1 << DDD2); // Clear the PD2 pin
    // PD2 is now an input

    PORTD |= ~(1 << PORTD2); // turn On the Pull-up

    // to see output
    /* NANO pin 13 (DDB5), set pin 5 of PORTB for output*/
    DDRB |= _BV(DDB5);
    while(1)
    {
        if( (PIND & (1<<PIND2)) > 0)
        {
            // do something if PD2 is ON
            /* NANO pin 13 (DDB5), set pin 5 low to turn led off */
            PORTB &= ~_BV(PORTB5);
        }else{
            // do something if PD2 is OFF
            /* NANO pin 13 (DDB5), set pin 5 high to turn led on */
            PORTB |= _BV(PORTB5);
        }
    }
}