#include <Arduino.h> 

int MODE = 1; 

int LED1 = 5;
int LED2 = 4;
int LED3 = 3;
int LED4 = 2;

int set = A1;   
int b1  = A2;       
int b2  = A3; 

int SET_BTN = 0;    
int UP_BTN = 0;         
int DN_BTN =0;  


void setup() {
pinMode(set, INPUT);
pinMode(b1,  INPUT);
pinMode(b2,  INPUT);
pinMode(LED1, OUTPUT);
pinMode(LED2, OUTPUT);
pinMode(LED3, OUTPUT);
pinMode(LED4, OUTPUT);
Serial.begin(9600);
}

void loop() {
SET_BTN = digitalRead(set);
UP_BTN = digitalRead(b1);
DN_BTN = digitalRead(b2);

// ====================SET=================================

if (SET_BTN == HIGH){ MODE++;}

  if(SET_BTN == HIGH){
    switch(MODE){
    case 1:
      MODE = 1;
      digitalWrite(LED1, HIGH);
      Serial.println("MOD1");
      delay(1000);
      digitalWrite(LED1, LOW);
      break;
    case 2:
      MODE = 2;
      digitalWrite(LED3, HIGH);
      Serial.println("MOD2");
      delay(1000);
      digitalWrite(LED3, LOW);
      break;
    }
  }


  if(MODE == 1){
   digitalWrite(LED2, HIGH);
   Serial.println("HELLO1");
    delay(1000);
    }
    else{digitalWrite(LED2, LOW);}


  if (MODE == 2){
    digitalWrite(LED4, HIGH);
    Serial.println("HELLO2");
     delay(1000);
    }
    else{digitalWrite(LED4, LOW);}

}