@mfalkvidd Thanks! now its works like a charm :D

Hello, will there be a good soul that will help improve the program? I know what the error is but I have no idea how to correct it.

  interruptReturn = sleep(PRIMARY_BUTTON_PIN-2, CHANGE, SECONDARY_BUTTON_PIN-2, CHANGE, ONE_DAY_SLEEP_TIME);

when i change

PRIMARY_BUTTON_PIN

the interruptReturn = 1, but when i change

SECONDARY_BUTTON_PIN

the interruptReturn = 0.
My question is how can i chane it to send 1 and 1 by both contactrons.

Full code:

//#define MY_DEBUG
#define MY_RADIO_NRF24
#define MY_NODE_ID 100
#define MY_PARENT_NODE_ID 0
#define MY_PARENT_NODE_IS_STATIC

#include <MySensors.h>
#include "Vcc.h"

#define SKETCH_NAME "WindowSlimSensor2pcs_smallR"

#define PRIMARY_CHILD_ID 1
#define PRIMARY_BUTTON_PIN 2
#define SECONDARY_CHILD_ID 2
#define SECONDARY_BUTTON_PIN 3
#define BATTERY_REPORT_DAY 2   // Desired heartbeat interval when inactive. Maximum heartbeat/report interval is equal to this due to the dayCounter.
#define BATTERY_REPORT_BY_IRT_CYCLE 10  // Adjust this according to usage frequency.
#define ONE_DAY_SLEEP_TIME 86400000

//#define BATTERY 3

MyMessage msg(PRIMARY_CHILD_ID, V_TRIPPED);
MyMessage msg2(SECONDARY_CHILD_ID, V_TRIPPED);
//MyMessage msg3(BATTERY, V_CUSTOM);

int dayCounter = 0;
int irtCounter = 0;
bool interruptReturn=false;
const float VccMin   = 1.7;           // Minimum expected Vcc level, in Volts.
const float VccMax   = 3.3;           // Maximum expected Vcc level, in Volts.
const float VccCorrection = 3.43 / 3.455;  // Measured Vcc by multimeter divided by reported Vcc


const int32_t report_interval = 8640000; // 1day -> h * m * s * ms NOTICE: milliseconds, not microseconds!

Vcc vcc(VccCorrection);
//Vcc vcc;
#ifdef MY_DEBUG
void before(){
    Serial.begin(9600);
}
#endif

void setup()
{
    pinMode(PRIMARY_BUTTON_PIN, INPUT);
    pinMode(SECONDARY_BUTTON_PIN, INPUT);
      //EXTERNAL pull-ups
    digitalWrite(PRIMARY_BUTTON_PIN, LOW);
    digitalWrite(SECONDARY_BUTTON_PIN, LOW);  
}

void presentation()
{
    sendSketchInfo(SKETCH_NAME, __DATE__);
    present(PRIMARY_CHILD_ID, S_DOOR, "Lewe Okno");
    present(SECONDARY_CHILD_ID, S_DOOR, "Prawe Okno");
  //  present(BATTERY, S_CUSTOM);
}

void loop()

{
    uint8_t reedState;
    uint8_t reedState2;
    static uint8_t lastReedState = 2;
    static uint8_t lastReedState2 = 2;
    sleep(5); // Short delay to allow buttons to properly settle
    reedState = digitalRead(PRIMARY_BUTTON_PIN);
    sleep(5); // Short delay to allow buttons to properly settle
    reedState2 = digitalRead(SECONDARY_BUTTON_PIN);

  if (!interruptReturn) { // Woke up by timer (or first run)
    dayCounter++; 
    if (dayCounter >= BATTERY_REPORT_DAY) {
          dayCounter = 0;
          sendBatteryReport();
    }
  }
  else {    // Woke up by pin change
            irtCounter++;
        sleep(5); 
  
      // Woke up by pin change
      if (reedState != lastReedState) {
        send(msg.set(reedState==HIGH ? 1 : 0));
        lastReedState = reedState;
    }
      if (reedState2 != lastReedState2) {
        send(msg2.set(reedState2==HIGH ? 1 : 0));
        lastReedState2 = reedState2;
    }
      if (irtCounter>=BATTERY_REPORT_BY_IRT_CYCLE) {
        irtCounter=0;
        sendBatteryReport();
      }
    
  }

  // Sleep until something happens with the sensor,   or one sleep_time has passed since last awake.
  interruptReturn = sleep(PRIMARY_BUTTON_PIN-2, CHANGE, SECONDARY_BUTTON_PIN-2, CHANGE, ONE_DAY_SLEEP_TIME);
  
} 

void sendBatteryReport() {
          uint8_t batteryPercent = (uint8_t)vcc.Read_Perc(VccMin, VccMax);
          sendBatteryLevel(batteryPercent);
}