diff --git a/labyrinthe/4-arduino_pyserial/4-labyrinthe-imu/4-labyrinthe-imu.ino b/labyrinthe/4-arduino_pyserial/4-labyrinthe-imu/4-labyrinthe-imu.ino
index 98e8cd3..8d6cad1 100644
--- a/labyrinthe/4-arduino_pyserial/4-labyrinthe-imu/4-labyrinthe-imu.ino
+++ b/labyrinthe/4-arduino_pyserial/4-labyrinthe-imu/4-labyrinthe-imu.ino
@@ -120,7 +120,8 @@ void loop() {
 
 	// Victoire
 	if (xy==92)  matrix.writeOnePicture(0x003c428100666600);
-	
+
+	// Affichage
 	matrix.display();
 	serial_msg = "";
 	serial_msg_complet = false;
diff --git a/labyrinthe/5-microbit/5-labyrinthe-microbit.py b/labyrinthe/5-microbit/5-labyrinthe-microbit.py
index 16ecd4f..3eb9340 100644
--- a/labyrinthe/5-microbit/5-labyrinthe-microbit.py
+++ b/labyrinthe/5-microbit/5-labyrinthe-microbit.py
@@ -18,7 +18,7 @@ from microbit import *
 # Initialisation
 ###############################################################################
 
-attente_image = Image("00000:00000:00900:00000:00000")
+attente_image = Image("00000:00000:00300:00000:00000")
 display.show(attente_image)  # Témoin de fonctionnement
 
 uart.init(baudrate= 115200) # Initialisation du port série
@@ -31,29 +31,28 @@ msg_str=''
 
 while True:
 
+    # A propos
+    if button_a.is_pressed() or button_b.is_pressed():
+        display.scroll("Labyrinte")
+        display.show(attente_image) # Témoin de fonctionnement
+        
     # Inclinaison de la carte -> UBGE
     accel_x=accelerometer.get_x() # Roulis
     accel_y=accelerometer.get_y() # Tangage
     uart.write(str(accel_x)+","+str(accel_y)+"\n")        
 
     # UBGE -> micro:bit (lecture du message)
-    new_byte = (uart.read(1))
-    if new_byte == None:
-        continue
-    new_char = str(new_byte, 'ascii')
-    msg_str += new_char
-
-    # Affichage de la position de la bille
-    if ("\n" in msg_str):
+    msg_byte = uart.readline()
+    if msg_byte:
         display.clear()
+        msg_str = str(msg_byte, 'ascii')
         if "91" in msg_str: # Chute
-            display.show(Image.ANGRY)
-            uart.write("start\n")  
+            display.show(Image.SAD)
+            sleep(500);
+            uart.write("start\n")
         elif "92" in msg_str: # Victoire
             display.show(Image.HAPPY)
-            uart.write("start\n")  
         else: # Position de la bille
             display.set_pixel(int(msg_str[0]), int(msg_str[1]), 9)
-        msg_str = ''
     
     sleep(100)