I make this sketch, it is working, code may be cleaner but it's working...

Available on github : https://github.com/Gis70/MySensors/tree/master/ParkingTempHum_sensor

This is my change and it is working, thank you for your help.

/**
 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 *
 * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
 * Copyright (C) 2013-2015 Sensnology AB
 * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
 *
 * Documentation: http://www.mysensors.org
 * Support Forum: http://forum.mysensors.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 *******************************
 *
 * DESCRIPTION
 *
 * Simple binary switch example 
 * Connect button or door/window reed switch between 
 * digitial I/O pin 3 (BUTTON_PIN below) and GND.
 * http://www.mysensors.org/build/binary
 */


// Enable debug prints to serial monitor
//#define MY_DEBUG 

// Enable and select radio type attached
#define MY_RADIO_NRF24
#define MY_RF24_PA_LEVEL RF24_PA_LOW
#define MY_NODE_ID 8


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


#define CHILD_ID_MAIL 0
#define CHILD_ID_MAIL2 1
#define CHILD_ID_VOLT 2                  // Child id for battery reading

#define BUTTON_PIN 2  // Arduino Digital I/O pin for button/reed switch
#define BUTTON2_PIN 3  // Arduino Digital I/O pin for button/reed switch
#define SLEEP_TIME 1 * 60 * 1000UL



int oldValueC1=-1;
int oldValueC2=-1;
boolean gwSend = true;

const float VccMin   = 3;           // Minimum expected Vcc level, in Volts.
const float VccMax   = 4;           // Maximum expected Vcc level, in Volts.
const float VccCorrection = 1.0/1.0;  // Measured Vcc by multimeter divided by reported Vcc
float batteryV = 0;
int batteryPcnt = 0;
Vcc vcc(VccCorrection);


// Change to V_LIGHT if you use S_LIGHT in presentation below
MyMessage msgMail(CHILD_ID_MAIL,V_TRIPPED);
MyMessage msgMail2(CHILD_ID_MAIL2,V_TRIPPED);
MyMessage msgVolt(CHILD_ID_VOLT, V_VOLTAGE);

void setup()  
{  
  // Setup the button
  pinMode(BUTTON_PIN, INPUT);
  pinMode(BUTTON2_PIN, INPUT);
  // Activate internal pull-up
  digitalWrite(BUTTON_PIN,HIGH);
  digitalWrite(BUTTON2_PIN,HIGH);


    #ifdef MY_DEBUG
      Serial.begin(115200);
    #endif    
  
 }

void presentation() {
  // Register binary input sensor to gw (they will be created as child devices)
  // You can use S_DOOR, S_MOTION or S_LIGHT here depending on your usage. 
  // If S_LIGHT is used, remember to update variable type you send in. See "msg" above.
  sendSketchInfo("BAL", "1.0");
  present(CHILD_ID_MAIL, S_DOOR);
  present(CHILD_ID_MAIL2, S_DOOR); 
  present(CHILD_ID_VOLT, S_MULTIMETER);
}


//  Check if digital input has changed and send in new value
void loop() 
{
  wait(100);
  // Get the update value
uint8_t  volet = digitalRead(BUTTON_PIN);
uint8_t  porte = digitalRead(BUTTON2_PIN);
  
  #ifdef MY_DEBUG
        Serial.println(volet);
        Serial.println(porte);
     #endif   
 
  if (volet != oldValueC1) {
     // Send in the new value
      gwSend = true;

     #ifdef MY_DEBUG
        Serial.println(volet);
     #endif   
     
     oldValueC1 = volet;
  }

    if (porte != oldValueC2) {
     // Send in the new value
      gwSend = true;

     #ifdef MY_DEBUG
        Serial.println(porte);
     #endif   
     
     oldValueC2 = porte;
  }  
    
    batteryV  = vcc.Read_Volts();
    batteryPcnt = vcc.Read_Perc(VccMin, VccMax);
    send(msgVolt.set(batteryV, 2));
    sendBatteryLevel(batteryPcnt);

     #ifdef MY_DEBUG
        //delay(2000);
        Serial.println(batteryPcnt);
     #endif    
     
   

   if (gwSend == true) {
    
     send(msgMail.set(volet==LOW ? 1 : 0));
     send(msgMail2.set(porte==LOW ? 1 : 0));
     send(msgVolt.set(batteryV, 2));
     sendBatteryLevel(batteryPcnt);
     gwSend = false;
   }
  else {
  }

sleep(0, FALLING, 1, FALLING, SLEEP_TIME);
}