#define ADC_IN A5
#define ADC_REF 3.3
 
char led_red = 23;
char led_yellow = 19;
char led_green = 18;

char pb_green = 27;
char pb_blue = 25;

void setup() {
  // put your setup code here, to run once:
 pinMode (led_red,OUTPUT);
 pinMode (led_yellow,OUTPUT);
 pinMode (led_green, OUTPUT);

 pinMode(pb_green, INPUT);
 pinMode(pb_blue, INPUT);
 
 Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  // Reading the output of ADC
  int val_ADC;
  val_ADC=analogRead(ADC_IN);
  
  //Print the value out
  Serial.print("ADC value =");
  Serial.println(val_ADC, DEC);
  delay (100);

  float voltage;

  if(val_ADC < 1000)
  
  {digitalWrite(led_green, HIGH);
   digitalWrite(led_red, LOW);
   }

  else if ((val_ADC >=1000)&&(val_ADC<=3500))

{
digitalWrite(led_green, LOW);
   digitalWrite(led_red, LOW);
   }

else
{
digitalWrite(led_green, HIGH);
   digitalWrite(led_red, HIGH);
}

}