#define FanPin 5
#define SwFanPin 12
int BTFan;
int BTFanState;
int LastBTFanState = LOW;
bool FanState = LOW;
unsigned long LastDebounceTimeBTFan = 0;

unsigned long DebounceDelay = 50;

void setup(){
  pinMode(FanPin, OUTPUT);
  digitalWrite(FanPin, HIGH);
  pinMode(SwFanPin, INPUT_PULLUP);
}
void loop(){
  BTFan = digitalRead(SwFanPin);
  if(BTFan != LastBTFanState) {
    LastDebounceTimeBTFan = millis();
  }
  if((millis() - LastDebounceTimeBTFan) > DebounceDelay){
    if(BTFan != BTFanState) {
      BTFanState = BTFan;

      if(BTFanState == LOW) {
        FanState = !FanState;
      }
    }
  }
if(FanState==0){
  digitalWrite(FanPin, LOW);
}
else{
  digitalWrite(FanPin, HIGH);
}
LastBTFanState = BTFan;
}