diff --git a/README.md b/README.md
index 98a42ea..253ea95 100644
--- a/README.md
+++ b/README.md
@@ -4,15 +4,27 @@ Arduino's code is something like:
 ```c
 int joystickPin = A0; 
 int getPushedButton(int joystickPin){
-  int val=analogRead(joystickPin);
+    /*
+    * retourne le numéro du boutton appuyé 
+    * bouton    |    numéro |  mesure analogRead
+    * aucun     |   0       | 1024
+    * haut      |   1       | 19
+    * bas       |   2       | 8
+    * gauche:   |   3       | 54
+    * droite:   |   4       | 705
+    * bas2 :    |   5       | 511
+    * haut2:    |   6       | 183 
+    */
+    int val=analogRead(joystickPin);
+
   if(val > 1000){
    return 0; 
   }else if (val > 650){
     return 4;
   }else if(val > 450){
-   return 6; 
+   return 5; 
   }else if(val > 120){
-    return 5;
+    return 6;
   }else if(val > 45){
     return 3;
   }else if(val > 15){
@@ -21,6 +33,19 @@ int getPushedButton(int joystickPin){
    return 2; 
   }
 }
+
+
+
+void setup() {
+  Serial.begin(9600);
+}
+
+
+void loop() {
+    int button=getPushedButton(A0);
+    Serial.println(button);
+    delay(500);
+}
 ```
 
 Adapt limit values if you use differents resistors than mines.