diff --git a/ws2812.c b/ws2812.c
index b07638e..cac360d 100644
--- a/ws2812.c
+++ b/ws2812.c
@@ -62,11 +62,31 @@ void ws2812_init(){
 
     // Tout rouge !
     for(uint32_t i = 0; i<12; i++){
-        ws2812_set_buffer_rgb(0x10, 0, 0, i);
+        ws2812_set_buffer_rgb(0x1, 0, 0, i);
     }
     ws2812_affiche_buffer();
 }
 
+
+void ws2812_arc_en_ciel(){
+    while(1){
+        uint32_t i;
+        sleep_ms(50);
+
+        // Affichage
+        for(i = 0; i<12; i++){
+            ws2812_set_buffer(couleur[i], i);
+        }
+        ws2812_affiche_buffer();
+
+        // Décalage des couleurs
+        for(i = 0; i<12; i++){
+            couleur[i] = couleur[i+1];
+        }
+        couleur[12]=couleur[0];
+    }
+}
+
 static inline void put_pixel(uint32_t pixel_grb) {
     pio_sm_put_blocking(pio0, 0, pixel_grb << 8u);
 }
@@ -88,4 +108,10 @@ void ws2812_set_buffer_rgb(uint8_t rouge, uint8_t vert, uint8_t bleu, uint8_t in
     if(index_led <12){
         buffer_couleur[index_led] = urgb_u32(rouge, vert,bleu);
     }
+}
+
+void ws2812_set_buffer(uint32_t couleur, uint8_t index_led){
+    if(index_led <12){
+        buffer_couleur[index_led] = couleur;
+    }
 }
\ No newline at end of file
diff --git a/ws2812.h b/ws2812.h
index 40cdf19..dca15e4 100644
--- a/ws2812.h
+++ b/ws2812.h
@@ -2,4 +2,6 @@
 
 void ws2812_init(void);
 void ws2812_affiche_buffer(void);
-void ws2812_set_buffer_rgb(uint8_t rouge, uint8_t vert, uint8_t bleu, uint8_t index_led);
\ No newline at end of file
+void ws2812_set_buffer_rgb(uint8_t rouge, uint8_t vert, uint8_t bleu, uint8_t index_led);
+void ws2812_set_buffer(uint32_t couleur, uint8_t index_led);
+void ws2812_arc_en_ciel(void);
\ No newline at end of file