Experiment 2: Digital input program 1

digi_input1.ino

// the setup function runs once when you press reset or power the board

byte counter1 = 0; // define variables

byte counter2 = 0; // not used in this programme

void setup() {

    // initialize Ports B and C pins 0-5 as outputs.

    DDRB = 0b00111111;

    DDRC = 0b00111111;

    PORTB = 0; // both ports start from zero

    PORTC = 0;

    pinMode(2, INPUT_PULLUP); // Make bit 2 of Port D an input
}

// the loop function runs over and over again forever

void loop() {

    PORTC = counter1;

    // if (digitalRead(2) != 0){counter1++;}

    if ((PIND & 0b00000100) != 0) {
        counter1++;
    }

    // either of the two lines above can be used

    delay(1000); // reduce this delay for faster counting
}