int checkVolt = 3;
float result;
void setup() {
  // put your setup code here, to run once:
pinMode(checkVolt, INPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
float v = analogRead(checkVolt);
result=(5./1023.)*v;
Serial.println(result);
delay(100);
}