matrix.ino

#include <Adafruit_GFX.h>
#include "Adafruit_LEDBackpack.h"

#define break_beam_ONE 11
#define break_beam_TWO 10

int breakBeamState_ONE = 0;
int breakBeamState_TWO = 0;

Adafruit_BicolorMatrix matrix = Adafruit_BicolorMatrix();

static const uint8_t PROGMEM
    slot_1_bmp[] =
        {
            B00000000,
            B00011000,
            B00011000,
            B00111000,
            B00011000,
            B00011000,
            B00011000,
            B01111110},
    slot_2_bmp[] =
        {
            B00000000,
            B00111100,
            B01100110,
            B00000110,
            B00001100,
            B00110000,
            B01100000,
            B01111110};

const uint8_t *activeSlot[] PROGMEM = {slot_1_bmp, slot_2_bmp};

void setup()
{
    Serial.begin(115200);
    // while (!Serial)
    //     ;
    Serial.println("Starting up");

    pinMode(break_beam_ONE, INPUT);
    digitalWrite(break_beam_ONE, HIGH);

    pinMode(break_beam_TWO, INPUT);
    digitalWrite(break_beam_TWO, HIGH);

    matrix.begin(0x70);
}

int activeIndex;

bool toggle = false;

void loop()
{
    toggle = !toggle;

    breakBeamState_ONE = digitalRead(break_beam_ONE);
    breakBeamState_TWO = digitalRead(break_beam_TWO);

    if (toggle)
    // if (!breakBeamState_ONE)
    {
        activeIndex = 0;
    }
    else if (!toggle)
    // else if (!breakBeamState_TWO)
    {
        activeIndex = 1;
    }

    matrix.clear();
    matrix.drawBitmap(0, 0, activeSlot[activeIndex], 8, 8, LED_YELLOW);
    matrix.writeDisplay();
    delay(500);
}