diff --git a/bike.c b/bike.c
index b14b42a..f70eb85 100644
--- a/bike.c
+++ b/bike.c
@@ -18,7 +18,27 @@ LV_FONT_DECLARE(lv_font_din_16);
 
 static void battery_timer_cb(lv_timer_t* timer) {
     int8_t battery_percent = lv_battery_indicator_get_percentage(battery_indicator);
-    battery_percent -= 1;
+    battery_percent -= 1;
+    static int accelerating = 0;
+
+    if (speed_meter != NULL) {
+        if (accelerating) {
+
+            lv_speedmeter_set_speed(speed_meter, lv_speedmeter_get_speed(speed_meter) + 1.5f);
+
+            if (lv_speedmeter_get_speed(speed_meter) >= 90.0f) {
+                accelerating = 0;
+            }
+        }
+        else {
+            lv_speedmeter_set_speed(speed_meter, lv_speedmeter_get_speed(speed_meter) - 1.0f);
+
+            if (lv_speedmeter_get_speed(speed_meter) <= 0.0f) {
+                accelerating = 1;
+            }
+        }
+    }
+
     if (battery_percent < 0)
     {
         battery_percent = 100;
diff --git a/widgets/speedmeter.c b/widgets/speedmeter.c
index cd653d2..284638b 100644
--- a/widgets/speedmeter.c
+++ b/widgets/speedmeter.c
@@ -193,7 +193,9 @@ lv_obj_t* lv_speedmeter_create(lv_obj_t* parent, int max_speed, const char* unit
 void lv_speedmeter_set_speed(lv_obj_t* obj, float speed) {
     lv_speedmeter_t* self = (lv_speedmeter_t*)obj;
     self->speed = speed;
-    lv_arc_set_value(self->speed_arc, (int)(self->speed / self->max_speed));
+    int arc_value = (int)(self->speed / self->max_speed * 100.0);
+    lv_arc_set_value(self->speed_arc, arc_value);
+    lv_obj_send_event(self->speed_arc, LV_EVENT_VALUE_CHANGED, NULL);
 }
 
 float lv_speedmeter_get_speed(lv_obj_t* obj) {