const int A = A4;
int V = 0;
int H = 3;
int F= 4;
 int i=0; 

void setup() {
  // put your setup code here, to run once:
 Serial.begin(9600);
 pinMode (H,OUTPUT);
 pinMode (F,OUTPUT); 
  pinMode (A,INPUT); 
 
}

void loop() {
  // put your main code here, to run repeatedly:
V = analogRead(A);
 Serial.print("sensor = ");
 Serial.println(V);
if (V<10){
 digitalWrite (H,LOW);
 digitalWrite (F,LOW);
}
if (V>10 && V<20){
  digitalWrite (H,HIGH);
  digitalWrite (F,LOW);
}
if (V > 20){
  digitalWrite (H,HIGH);
  digitalWrite (F,HIGH);
}


delay(2);
}