#include <LiquidCrystal.h>
const int rele=10;
const int tlacitko=13;
int zapnuto;

void setup() {
  // put your setup code here, to run once:
  pinMode(rele, OUTPUT);
  pinMode(tlacitko, INPUT_PULLUP);
  Serial.begin(9600);
  Serial.print("=START=");
}

void loop() {
  // put your main code here, to run repeatedly:
  zapnuto=digitalRead(tlacitko);
  
  if (zapnuto==0) {
    digitalWrite(rele, HIGH);
    Serial.println("*ON*");
  } 
  else {
    digitalWrite(rele, LOW);
    Serial.println("+OFF+");
  };

}