diff --git a/Services/Scheduler.c b/Services/Scheduler.c
new file mode 100644
index 0000000..4c78041
--- /dev/null
+++ b/Services/Scheduler.c
@@ -0,0 +1,21 @@
+#include "Scheduler.h"
+#include "Timer.h"
+#include "stm32f1xx_ll_utils.h"
+
+void (*it_callback_SysTick)(void); 
+
+void SysTick_Handler(void)
+{
+	(*it_callback_SysTick)();
+}	
+
+void Scheduler_conf(void (*it_callback) (void))
+{
+	it_callback_SysTick = it_callback;
+	LL_Init1msTick(1000);
+}
+
+void Scheduler_start(void)
+{
+	
+}
diff --git a/Services/Scheduler.h b/Services/Scheduler.h
new file mode 100644
index 0000000..13c9c89
--- /dev/null
+++ b/Services/Scheduler.h
@@ -0,0 +1,22 @@
+#ifndef SCHEDULER_H
+#define SCHEDULER_H
+
+#include "stm32f103xb.h" 
+
+/**
+	* @brief  Configure l'horloge interne comme ordonanceur
+  * @note   
+	* @param  (void)* it_callback : Tache de fond à executer
+  * @retval None
+  */
+void Scheduler_conf(void (*it_callback) (void));
+
+/**
+	* @brief  Démarre ordonanceur
+  * @note   
+	* @param  None
+  * @retval None
+  */
+void Scheduler_start(void);
+
+#endif
diff --git a/Src/main.c b/Src/main.c
index c440ba6..1d6d586 100644
--- a/Src/main.c
+++ b/Src/main.c
@@ -21,17 +21,36 @@
 #include "stm32f1xx_ll_system.h" // utile dans la fonction SystemClock_Config
 
 #include "Sail.h"
+#include "Scheduler.h"
 
 void  SystemClock_Config(void);
 
 /* Private functions ---------------------------------------------------------*/
 
+int counter = 1;
+
+void backgroundTask()
+{
+	counter++;
+	Sail_background();
+}
+
+
+void configurePeripherals()
+{
+	Sail_conf();
+}
+
+void startPeripherals()
+{
+	Sail_start();
+}
+
 /**
   * @brief  Main program
   * @param  None
   * @retval None
   */
-
 int main(void)
 {
   /* Configure the system clock to 72 MHz */
@@ -43,9 +62,12 @@ int main(void)
 	// Lancement chronomètre
 	// Chrono_Start(); 
 	// time = Chrono_Read();
-  
-	Sail_conf();
-	Sail_start();
+  configurePeripherals();
+	startPeripherals();
+	
+	Scheduler_conf(backgroundTask);
+	Scheduler_start();
+	
   while (1)
   {
   }