#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   2

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);


uint8_t band_button[10] = {2,3,4,5,6,7,8,9,10,11};
uint8_t mem_button = 12;
uint8_t inc_button = 43;
uint8_t dec_button = 42;
uint8_t band_led[10] = {22,23,24,25,26,27,28,29,30,31};
uint8_t relay[8] = {32,33,34,35,36,37,38,39};
uint8_t relay_value = 0;
uint8_t band_value = 0;
uint8_t band_relay_value[10];
bool inc_flag = true;
bool dec_flag = true;
bool mem_flag = true;


void setup() {
  // put your setup code here, to run once:
  for (uint8_t i = 0; i<10; i++) {
    pinMode(band_button[i], INPUT_PULLUP);
    pinMode(band_led[i], OUTPUT);
    band_relay_value[i] = 0;
  }

  for (uint8_t i = 0; i<8; i++) {
    pinMode(relay[i], OUTPUT);
  }

  pinMode(mem_button, INPUT_PULLUP);
  pinMode(inc_button, INPUT_PULLUP); 
  pinMode(dec_button, INPUT_PULLUP);

  digitalWrite(band_led[band_value], HIGH);

  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print(relay_value);
} 
  

void loop() {
  // put your main code here, to run repeatedly:
  for (uint8_t i=0; i<10; i++){
    if (digitalRead(band_button[i]) == 0) {
        band_value = i;
        show_band_value();
      }
    }

    if (digitalRead(inc_button) == 0) {
      if (relay_value < 127) {
        relay_value++;
        set_relays();
      }
    }

    if (digitalRead(dec_button) == 0){
      if (relay_value > 0) {
        relay_value--;
        set_relays();
      }
    }

    if (digitalRead(mem_button) == 0) {
      band_relay_value[band_value] = relay_value;
    }

    lcd.setCursor(0, 0);
    lcd.print(relay_value);
    delay(200);
  }


void show_band_value() {
  for (uint8_t i=0; i<10; i++){
    digitalWrite(band_led[i], LOW);
  }
  digitalWrite(band_led[band_value], HIGH);  
  relay_value = band_relay_value[band_value];
  set_relays();
}

void set_relays() {
  uint8_t mult;
  for (uint8_t i=0; i<8; i++) {
    mult = 1 << i;
    if ((relay_value & mult) != 0) {
      digitalWrite(relay[i], HIGH);
    } else {
      digitalWrite(relay[i], LOW);
    }
  }
}