SemaphoreHandle_t mutex_v; 
int ledPin = 2;             
int inputPin = 4;
int inputButton = 13;
int Analog = LOW;
int val = 0;
int lastState = HIGH;
int value = digitalRead(inputButton);

void setup() {
  pinMode(inputButton, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);
  pinMode(inputPin, INPUT);
  Serial.begin(9600);
    mutex_v = xSemaphoreCreateBinary();
  if (mutex_v == NULL) { 
        Serial.println("Mutex can not be created"); 
    } 
    xTaskCreate(MainCheck, "Option1", 1024, NULL, 1, NULL); 
    xTaskCreate(LightSignal, "Option2", 1024, NULL, 2, NULL);
}
void ChangeSignal(){
  digitalWrite(ledPin, !digitalRead(ledPin));
    Serial.println("Led State Changed  ");
}

void LightSignal(void *pvParameters){
  while(1){
  if(xSemaphoreTake(mutex_v, portMAX_DELAY)){
    ChangeSignal();
    }
  }
}

void MainCheck(void *pvParameters){
  bool k = false;
  Serial.println("Looking for smoke");
  while(1){
    val = analogRead(inputPin);
    if (val >= 2000) {
      if (Analog == LOW) {
        Serial.println("SMOKE");
        Analog = HIGH;
        if(!k){
          k=true;
          xSemaphoreGive(mutex_v);
        }
      }
    } else {
      if (Analog == HIGH) {
        Serial.println("Smoke cleared");
        Analog = LOW;
      }
      if(k){
        value = digitalRead(inputButton);
        if(lastState != value){
          lastState = value;
          if(value == 0){
            k=false;
            xSemaphoreGive(mutex_v);
            Serial.println("RESET");
          }
        }
      }
    }
  vTaskDelay(100/portTICK_PERIOD_MS);
  }
}

void loop() {
}