char red_led = 23;
char yellow_led = 19;
char green_led = 18;

char red_led_state = LOW;
char yellow_led_state = LOW;
char green_led_state = LOW;

long red_led_previous_millis = 0; 
long green_led_previous_millis = 0;
long yellow_led_previous_millis = 0;

int red_led_interval = 100;
int green_led_interval = 150;
int yellow_led_interval = 190;

#define ADC_REF 3.3
 
void setup() 
{

  pinMode (red_led, OUTPUT);
  pinMode (green_led, OUTPUT);
  pinMode (yellow_led, OUTPUT);

  Serial.begin(9600);

}


void loop() 
{

  long current_millis = millis();

  if (current_millis - red_led_previous_millis >= red_led_interval)

      {
        
        red_led_previous_millis = current_millis;

        if (red_led_state == LOW)
            red_led_state = HIGH;

        else 
            red_led_state = LOW;

        digitalWrite(red_led, red_led_state);    
       
      }

  if (current_millis - green_led_previous_millis >= green_led_interval)

      {
        
        green_led_previous_millis = current_millis;

        if (green_led_state == LOW)
            green_led_state = HIGH;

        else 
            green_led_state = LOW;

        digitalWrite(green_led, green_led_state);    
       
      }

  if (current_millis - yellow_led_previous_millis >= yellow_led_interval)

      {
        
        yellow_led_previous_millis = current_millis;

        if (yellow_led_state == LOW)
            yellow_led_state = HIGH;

        else 
            yellow_led_state = LOW;

        digitalWrite(yellow_led, yellow_led_state);    
       
      }




  {int ADC_value; 
  ADC_value = analogRead(A5);  

//Print the value out
    Serial.print("ADC Value =");
    Serial.println(ADC_value, DEC);

  float Voltage;
  Voltage = (ADC_value/4095.0) * ADC_REF;
  Serial.print("Voltage =");
  Serial.println(Voltage, DEC); 
  }
    delay(2000);
      
      
      
      
      
}