diff --git a/sketch_may16b/sketch_may16b.ino b/sketch_may16b/sketch_may16b.ino
index 2340a4c..b9e1288 100644
--- a/sketch_may16b/sketch_may16b.ino
+++ b/sketch_may16b/sketch_may16b.ino
@@ -1,6 +1,6 @@
 #include <Servo.h>
 
-#define SAMPLESIZE 100;
+#define SAMPLESIZE 100
 
 int Sensor_1;
 int samples[SAMPLESIZE];
@@ -9,7 +9,7 @@ int oldTimer;
 int delayBetweenOutput = 100;
 int servoPin = 3;
 
-Servo balanceScale
+Servo balanceScale;
 
 void setup() {
   // put your setup code here, to run once:
@@ -29,10 +29,34 @@ void setup() {
   // enable timer compare interrupt
   TIMSK2 |= (1 << OCIE2A);
   sei();  // Enable interrupts
-  timer = millis()
+  timer = millis();
 }
 
 void loop() {
   // put your main code here, to run repeatedly:
-
+  balanceScale.write(map(moyenne(),0,1023,180,0));
+}
+
+ISR(TIMER2_COMPA_vect){
+  TCNT1  = 0;
+  Sensor_1 = analogRead(0);
+  rollSamples(Sensor_1);
+}
+
+void rollSamples(int newData){
+  // décaler les données existantes vers la gauche
+  for (int i = 0; i < SAMPLESIZE - 1; i++) {
+    samples[i] = samples[i+1];
+  }
+  // ajouter la nouvelle donnée à la fin du tableau
+  samples[SAMPLESIZE - 1] = newData;
+  
+}
+
+double moyenne(){
+  long all = 0;
+  for(int i = 0; i<SAMPLESIZE-1;i++){
+    all += samples[i];
+  }
+  return double(all)/double(SAMPLESIZE);
 }