#include <Wire.h>                //oled
#include <Adafruit_GFX.h>       //oled
#include <Adafruit_SSD1306.h>   //oled

#define button 2                //define button pin
#define relay_module 4
Adafruit_SSD1306 display(128,64,&Wire,-1);    //library function

/********FUNCTION DEFINED********************/
void display_welcome_message();
bool detect_button();

void setup()
{
  // put your setup code here, to run once:
  Serial.begin(115200);
  display_welcome_message();
  bool state = 1;
  
  

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
   state = detect_button();
    if(state == 0)
    {
      display_welcome_message();
    }
}
void display_welcome_message()
{
   if(!display.begin(SSD1306_SWITCHCAPVCC,0x3c))
  {Serial.write("failed loading....");
    while(true);
  }
  delay(1000);
  display.clearDisplay();
  display.setTextSize(2);
  display.setCursor(0,10);
  display.setTextColor(WHITE);
  display.println("WELCOME TO   CAFE");
  display.display();
  delay(1000);
  display.clearDisplay();
  display.setCursor(0,10);
  display.setTextColor(WHITE);
  display.println("PRESS BUTTON TO START");
  display.display();
}
bool detect_button()
{
  bool state;
  pinMode(button,INPUT);
  state = digitalRead(button);

  return state;
}

void relay(bool state)
{
  pinMode(relay_module, OUTPUT);
  digitalWrite(relay_module,state);
}