void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(8, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  int A=map(analogRead(A2),0,1023,0,5);
  Serial.println(A);
  if (A<=2){
 digitalWrite(8, HIGH);
  }
else{
  digitalWrite(8, LOW);
}
}