diff --git a/due_obd2/obd2_bt.c b/due_obd2/obd2_bt.c
index 8213cf3..5cd0184 100644
--- a/due_obd2/obd2_bt.c
+++ b/due_obd2/obd2_bt.c
@@ -32,19 +32,28 @@ void obd2_bt_get_state(obd2_bt_t *bt, char *state)
     default:
         strcpy(state, "Unknown     ");
         break;
-    }    
+    }
 }
 
 void obd2_bt_process(obd2_bt_t *bt)
 {
-    __UINT32_TYPE__ bt_state = digitalRead(BT_STATE_PIN);
-    if (bt_state)
+    if (bt->state != BT_CONNECTED)
     {
-        bt->state = BT_CONNECTED;
+        __UINT32_TYPE__ bt_state = digitalRead(BT_STATE_PIN);
+
+        if (bt_state != bt->state)
+        {
+            if (bt_state)
+            {
+                bt->state = BT_CONNECTED;
+            }
+            else
+            {
+                bt->state = BT_INITIALISING;
+            }
+            bt->on_state_change();
+        }
     }
-    else
-    {
-        bt->state = BT_INITIALISING;
-    }
-    bt->on_state_change();
+
+    /* TODO read from Serial1 to read OBD2 data */
 }
\ No newline at end of file