int slider1 = 3;
int slider2 = 2;
int slider1_state = 0;
int slider2_state = 0;
int greenLED = 13; 
int redLED = 12;
int writing = 1;
 
  void setup()
  {
   
  pinMode (greenLED, OUTPUT);
  pinMode (redLED, OUTPUT);
  pinMode (slider1, INPUT);
  pinMode (slider2, INPUT);
  Serial.begin(9600);
   
  }
 
  void loop()
  {
  slider1_state = digitalRead(slider1);
  slider2_state = digitalRead(slider2);
   
   
     if (slider1_state == LOW && slider2_state == LOW && writing == 1)
  {
   
    Serial.println("Waiting...");
  
    writing = 0;
  }
 
  else if (slider1_state == HIGH && slider2_state == LOW)
  {
  
    Serial.println("Vending Soda...");
    digitalWrite (greenLED, HIGH);
    delay (1000);
    digitalWrite (greenLED, LOW);
    delay (1000);
    writing = 1;
  }
 
  else if (slider1_state == LOW && slider2_state == HIGH)
  {
   
    Serial.println("Vending Water...");
    digitalWrite (greenLED, HIGH);
    delay (1000);
    digitalWrite (greenLED, LOW);
    delay (1000);
    writing = 1;
  }
 
  else if (slider1_state == HIGH && slider2_state == HIGH)
  {

    Serial.println("Product Not Available...");
    digitalWrite (redLED, HIGH);
    delay (1000);
    digitalWrite (redLED, LOW);
    delay (1000);
    writing = 1;
  }

  
 
}