#include <SoftwareSerial.h>
SoftwareSerial softSerial(3, 4); //TX_BT --> D3 / RX_BT --> D4

String str;
int blueToothVal;
#define relay 12
int a = 0;
void setup()
{
  Serial.begin(9600);
  softSerial.begin(9600);
  pinMode(relay, OUTPUT);
  digitalWrite(relay, HIGH);
}
void loop()
{
  bluetooth();
  if (a == 1) {
    digitalWrite(relay, LOW);
    delay(100);
    digitalWrite(relay, HIGH);
    delay(100);
  }
  else {
    digitalWrite(relay, HIGH);
  }
}




void bluetooth()
{
  while (softSerial.available())
  {
    {
      str = softSerial.readStringUntil('\n');
      Serial.println(str);
    }

    blueToothVal = (str.toInt());
    Serial.println(blueToothVal);
    switch (blueToothVal)
    {
      case 1:
        a = 1;
        break;

      case 2:
        a = 2;
        break;
    }

  }

}