#include <SoftwareSerial.h>
SoftwareSerial mySerial(4,3);
// Transmitter

int Button = 1;
int LED = 0;
void setup() {
// put your setup code here, to run once:

  mySerial.begin(9600); // for communication
  pinMode(Button, INPUT_PULLUP); // for read button
  pinMode(LED,OUTPUT); // for read button
 
}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(Button) == 0)
  {
    mySerial.write('1');
  }
  delay(20); // waitting message send
 if(mySerial.available())
  {
    if( mySerial.read() == '1')
    {
      digitalWrite(LED, 1);
    }
    
  }
  delay(20); // waitting message reciev
  digitalWrite(LED, 0);
}