#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(23, OUTPUT);
  pinMode(19, OUTPUT);
  pinMode(18, OUTPUT);

  pinMode(27, INPUT);
  pinMode(25, 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(10);

  float voltage;
  voltage = val_ADC / 4095.0 * ADC_REF;
  Serial.print("Voltage = ");
  Serial.println(voltage, DEC);

  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);
  }
}