int red=2;


void setup() {
  // put your setup code here, to run once:
Serial.begin(38400);
pinMode (red,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:

 byte x=Serial.read()  ;    //recieve the signal from the other chip
Serial.println(x);
switch(x){                  
       
        case (1):{        //FISRT case is to turn the red LED off  (recieved 1 from the master)
             digitalWrite(red,LOW);
        }
        break;
        case (2):{      //SECOND case is to light the red LED when the signal is too high (recieved 2 from the master)
             digitalWrite(red,HIGH);
        }}
}