int voltage = 3;
int led;
int ledb = 2;
void setup() {
  Serial.begin(9600);
  pinMode(voltage, INPUT);
  pinMode(ledb, OUTPUT);
}

void loop(){
led= digitalRead(voltage);
if(led==1){
  Serial.println("led is on");
  digitalWrite(ledb, HIGH);


}
else if (led==0){
  Serial.println("led is of");
  digitalWrite(ledb, LOW);
}

}