const int sen = A0;
const int led25 = 2;
const int led50 = 3;
const int led75 = 4;
int wl;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(led25, OUTPUT);
  pinMode(led50, OUTPUT);
  pinMode(led75, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  wl = analogRead(sen);
  Serial.println(wl);
  if (wl >= 560){
    digitalWrite(led25, HIGH);
    if (wl >= 580){
      digitalWrite(led50, HIGH);
      if (wl >= 630){
        digitalWrite(led75, HIGH);
      }else{
        digitalWrite(led75, LOW);
      }
    }else{
      digitalWrite(led50, LOW);
    }
  }else{
    digitalWrite(led25, LOW);
  }
  

}