Reddit Keyboard Arduino code

#include <Keyboard.h>

uint8_t button_val[5];
bool down[5];
bool press_next[5];

uint8_t button_pins[5] = { 2, 3, 4, 5, 6 };
char button_keys[5] = { 'j', 'k', 'a', 'z', 'x' };

void setup()
{
    for(uint8_t i = 0; i < 5; i++) {
        pinMode(button_pins[i], INPUT_PULLUP);
    }

    Keyboard.begin();
}

void loop()
{
    for(uint8_t i = 0; i < 5; i++) {
        button_val[i] = digitalRead(button_pins[i]);
        press_next[i] = false;

        if (button_val[i] == 0 && !down[i]) {
            down[i] = true;
            press_next[i] = true;
        } else if (button_val[i] == 1 && down[i]) {
            down[i] = false;
        }
    }

    for(uint8_t i = 0; i < 5; i++) {
        if (press_next[i]) {
            Keyboard.press(button_keys[i]);
        }
    }

    delay(50);

    for(uint8_t i = 0; i < 5; i++) {
        if (press_next[i]) {
            Keyboard.release(button_keys[i]);
        }
    }

    delay(10);
}