int readPin=A3;
 int readVal;
 float V2= 0;
 int delayTime=500;

void setup() {
  // put your setup code here, to run once:
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(8, OUTPUT);
pinMode(A3, INPUT);                                                                                              
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(13, HIGH);
delay(500);
digitalWrite(13, LOW);
delay(500);
digitalWrite(13, HIGH);
delay(500);
digitalWrite(13, LOW);
delay(500);
digitalWrite(13, HIGH);
delay(500);
digitalWrite(13, LOW);
digitalWrite(12, HIGH);
delay(1000);
digitalWrite(12, LOW);
delay(1000);
digitalWrite(12, HIGH);
delay(1000);
digitalWrite(12, LOW);
delay(1000); 
digitalWrite(12, HIGH);
delay(1000)
;digitalWrite(12, LOW);
delay(1000);
digitalWrite(12, HIGH);
delay(1000);
digitalWrite(12, LOW);
delay(1000);
digitalWrite(12,HIGH); 
delay(1000);
digitalWrite(12, LOW);
delay(1000)
;digitalWrite(12, HIGH);
delay(1000);
digitalWrite(12, LOW);
digitalWrite(8, HIGH);
delay(1500);
digitalWrite(8, LOW);
delay(1500);
digitalWrite(8, HIGH);
delay(1500);
digitalWrite(8, LOW);
delay(1500);
digitalWrite(8, HIGH);
delay(1500);
digitalWrite(8, LOW);
delay(1500);
digitalWrite(8, HIGH);
delay(1500);
digitalWrite(8, LOW);
delay(1500);
digitalWrite(8, HIGH);
delay(1500);
digitalWrite(8, LOW);
delay(1500);
digitalWrite(8, HIGH);
delay(1500);
digitalWrite(8, LOW);
delay(1500);
digitalWrite(8, HIGH);
delay(1500);
digitalWrite(8, LOW);
delay(1500);
digitalWrite(8, HIGH);
delay(1500);
digitalWrite(8, LOW);
delay(1500);
digitalWrite(8, HIGH);
delay(1500);
digitalWrite(8, LOW);
readVal= analogRead(readPin);
V2= (5./1023.)*readVal
;Serial. println(V2);
delay(delayTime);
}