diff --git a/section_3/arduino.c b/section_3/arduino.c
index e68b61e..48f669a 100644
--- a/section_3/arduino.c
+++ b/section_3/arduino.c
@@ -79,10 +79,11 @@ return tv.tv_sec*1000+tv.tv_usec/1000;
 static void handleEvents(int sd){
 struct pollfd fds[2];
 char line[MAX_LINE];
-unsigned char packet[MAX_SERIAL];
+
 int ret;
 // my variables 
-int i;
+unsigned char packet[MAX_SERIAL];
+
 //
 fds[0].fd=STDIN_FILENO;
 fds[0].events=POLLIN;
@@ -91,13 +92,9 @@ fds[1].events=POLLIN;
 
 while(1){
   
-  if (butstates[0] == 1)
+  if (butstates[0] == 1 && butstates[1] == 0 && butstates[2] == 0 && butstates[3] == 0)
   {
-	
-	i = 0;
-	while (i <= BUTTONS_NB && butstates[i]) 
-		i += 1;
-	if(i <= BUTTONS_NB) loop();
+	loop();
   }
   ret=poll(fds,2,SLEEP_DELAY);
   if(ret==-1){ perror("poll"); exit(EXIT_FAILURE); }
@@ -119,16 +116,20 @@ while(1){
     printf("serial in: ");
 #endif
     int i;
+
     for(i=0;i<nb;i++){
 #ifdef DEBUG
-      printf("%02x ",packet[i]);
+	printf("%02x ",packet[i]);
 #endif
-      serialInHandler(packet[i]);
+	serialInHandler(packet[i]);
+      	
       }
+
 #ifdef DEBUG
     printf("\n");
 #endif
     }
+
   if(outsize>0){
     if(write(sd,outbuf,outsize)!=outsize) break;
 #ifdef DEBUG
diff --git a/section_3/main.c b/section_3/main.c
index 58ad95b..12a1e81 100644
--- a/section_3/main.c
+++ b/section_3/main.c
@@ -5,13 +5,19 @@
 ////
 // Include files
 ////
-#include "arduino.h"
 #include <stdio.h>
+#include <stdbool.h>
+#include "arduino.h"
+#define		MAX_SERIAL		1024
 ////
 // Global variables
 // my variables 
 int i;
 long now;
+bool decod;
+unsigned char decoded_packet[MAX_SERIAL];
+int j;
+int nb_0C;
 //
 ////
 
@@ -21,17 +27,44 @@ long now;
 
 void setup(void){
 	i = 0;	
+	j = 0;
+	decod = false;
+	nb_0C = 0;
 }
 
 void loop(void){
-	led((i-1 + LEDS_NB) % LEDS_NB, 0);
-	led(i % LEDS_NB, 1);
-	now = millis();
-	while(millis() != now+300);
-	i = (i+1) %  LEDS_NB;
+	if(millis() > now+300){
+		led((i-1 + LEDS_NB) % LEDS_NB, 0);
+		led(i % LEDS_NB, 1);
+		i = (i+1) %  LEDS_NB;
+	}
 	
 }
 
 
 void serialInHandler(unsigned char byte){
+	if(byte == '\xdb') {
+		decod = true;	
+	}
+	else if(byte == '\x0c') nb_0C += 1;
+	else if(decod){
+		if(byte == '\xdc')
+			decoded_packet[j] = '\xc0';
+		else if(byte== '\xdd')
+			decoded_packet[j] = '\xdb';
+		j += 1;
+		decod = false;
+	}else{
+
+		decoded_packet[j] = byte;
+		j += 1;
+	}
+	
+	if(nb_0C == 2){
+		printf("le packet décodé est de taille %d:\n", j);
+		nb_0C = 0;
+	}
+ 	/*for(int i = 0; i < j; i++) 
+		printf("%02x ", decoded_packet[i]);
+ 	printf("\n");*/
 }
--
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