LCD Menu

menu.ino

#include <LiquidCrystal.h>  //this library is included in the Arduino IDE

LiquidCrystal lcd(2, 3, 4, 5, 6, 7);

const int BTN_LEFT = 9;
const int BTN_RIGHT = 8;
const int BTN_CONFIRM = 10;

long last_read = 0;

char* list[] = {"menu1","menu2","menu3","menu4"};
byte index = 0;

void setup() {
    pinMode(BTN_LEFT,INPUT);
    pinMode(BTN_RIGHT,INPUT);
    pinMode(BTN_CONFIRM,INPUT);
    
    lcd.begin(16,2);
    Serial.begin(9600);
    printMenu(list[index]);
}

void loop() {
    
    if(millis() - last_read > 200) {
       if(digitalRead(BTN_LEFT) == 1) {
         buttonClicked(BTN_LEFT); 
       }
       if(digitalRead(BTN_RIGHT) == 1) {
         buttonClicked(BTN_RIGHT); 
       }
       if(digitalRead(BTN_CONFIRM) == 1) {
         buttonClicked(BTN_CONFIRM);  
       }
       last_read = millis();
    }
}

void buttonClicked(int btn) {
  if(btn == BTN_LEFT && index > 0 ) {
     --index;
  } else if (btn == BTN_RIGHT && index < 3) {
     index++;
  } else if (btn == BTN_CONFIRM) {
    char cmd[500] = "{\"menuSelected\": \"";
    strcat(cmd,list[index]);
    strcat(cmd, "\"}");
    Serial.println(cmd); 
  }
  
  printMenu(list[index]);
}

void printMenu(String s) {
  lcd.clear();
  lcd.print("OpenRad.io");
  lcd.setCursor(0,1);
  lcd.print(s);
}