diff --git a/code_arduino/serialArduino/serialArduino.ino b/code_arduino/serialArduino/serialArduino.ino
index cbf9d24..aa1af87 100644
--- a/code_arduino/serialArduino/serialArduino.ino
+++ b/code_arduino/serialArduino/serialArduino.ino
@@ -15,7 +15,7 @@
   BSD license, all text above must be included in any redistribution
  ***************************************************************************/
 
-byte requestBytes[3];   // for incoming serial data
+byte requestBytes[3];   // for incoming xBee data
 byte answerBytes[3];
 
 
@@ -23,6 +23,7 @@ byte answerBytes[3];
 #include <SPI.h>
 #include <Adafruit_Sensor.h>
 #include <Adafruit_BME280.h>
+#include <SoftwareSerial.h>
 
 #define BME_SCK 13
 #define BME_MISO 12
@@ -33,10 +34,21 @@ byte answerBytes[3];
 //Adafruit_BME280 bme(BME_CS); // hardware SPI
 Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI
 
-unsigned long delayTime;
+//on crée la liaison xBee
+
+SoftwareSerial xBee(2, 3);
+
+
+int luxPin = A0;
+float rawRange = 1024;
+float logRange = 5.0; 
 
 void setup() {
-    Serial.begin(9600);
+    xBee.begin(9600);
+    analogReference(EXTERNAL);
+    char requestBytes[3];
+    //tableau d'octets contenant les données
+    byte answerBytes[4];
     bme.begin();
 }
 
@@ -44,60 +56,29 @@ void setup() {
 void loop() { 
 
 
-    if (Serial.available() <= 3 && Serial.available() >= 1 ) {
-      Serial.readBytes(requestBytes,3);
+    if (xBee.available() <= 3 && xBee.available() >= 1 ) {
+      xBee.readBytes(requestBytes,3);
       if(requestBytes[0] == 'G' && requestBytes[1] == 'E' && requestBytes[2] == 'T') //Si 3 octets correspondant à G,E et T sont envoyé on envoie les données météo
       {
         //on charge les donnée dans la chaîne de bytes d'envoi (modélisé par un tableau)
+        
         answerBytes[0] = pressureToByte(bme.readPressure());
         answerBytes[1] = tempToByte(bme.readTemperature());
         answerBytes[2] = humidityToByte(bme.readHumidity());
-        
-        Serial.write(answerBytes,3);
-        /*Serial.println(answerBytes[0]+845,DEC);
-        Serial.println(answerBytes[1],DEC);
-        Serial.println(answerBytes[2],DEC);*/
+        answerBytes[3] = luxToByte(getLux());
+
 
+        //On envoie le buffer constituée des 4 donnée
+        xBee.write(answerBytes,4);
+
+        //on vide le buffer série pour éviter un décalage des requêtes
+        while(xBee.available() > 0)
+            xBee.read();
       }
     }
    // printValues();
 }
 
-
-void printValues() {
-    Serial.print("Temperature = ");
-    Serial.print(bme.readTemperature());
-    Serial.println(" *C");
-
-    Serial.print("Pressure = ");
-
-    Serial.print(bme.readPressure() / 100.0F);
-    Serial.println(" hPa");
-
-    Serial.print("Approx. Altitude = ");
-   // Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
-    Serial.println(" m");
-
-    Serial.print("Humidity = ");
-    Serial.print(bme.readHumidity());
-    Serial.println(" %");
-
-    Serial.println(pressureToByte(bme.readPressure())+845);
-    Serial.println(tempToByte(bme.readTemperature()));
-    Serial.println(humidityToByte(bme.readHumidity()));
-
-   // Serial.println(sizeof(bme.readPressure()));
-   // Serial.println(sizeof(int));
-    //sizeof(bme.readTemperature());
-    //Serial.println(500.9);
-    //Serial.println(arrondiSuperieur(500.9));
-    delay(1000);
-
-    
-
-    Serial.println("*******************************************");
-}
-
 int arrondiSuperieur(float val)
 {
   int newVal = 0;
@@ -110,9 +91,11 @@ int arrondiSuperieur(float val)
   return newVal;
 }
 
-int pressureToByte(float pressure)
+//Ces fonctions convertissent chaque donnée en un seul octet
+
+byte pressureToByte(float pressure)
 {
-  return (int)(arrondiSuperieur(pressure/100.0)-845);
+  return (byte)(arrondiSuperieur(pressure/100.0)-845);
 }
 
 byte tempToByte(float temp)
@@ -125,4 +108,21 @@ byte humidityToByte(float humidity)
   return (byte)arrondiSuperieur(humidity);
 }
 
+byte luxToByte(float lux)
+{
+  return (byte)(lux*255/10000);
+}
+
+//https://cdn-learn.adafruit.com/downloads/pdf/adafruit-ga1a12s202-log-scale-analog-light-sensor.pdf
+float getLux()
+{
+  int raw = analogRead(luxPin); 
+  float logLux = raw * logRange / rawRange;
+  float res = pow(10, logLux);
+  if(res > 10000.0)
+  {
+    res = 10000.0;
+  }
+  return res;
+}
 
--
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