diff --git a/EDA/ChangeLog b/EDA/ChangeLog
index 8a813f5..3be1ae2 100644
--- a/EDA/ChangeLog
+++ b/EDA/ChangeLog
@@ -1,3 +1,6 @@
+### v1.2
+- removed ANT1 ink on PCB
+
 ### v1.1
 - added beads to reduce EMI
 - fixed missong OE on TXB0108
diff --git a/main/blue.c b/main/blue.c
index ee7eda2..273189e 100644
--- a/main/blue.c
+++ b/main/blue.c
@@ -28,6 +28,7 @@
 #include "esp_hid_gap.h"
 
 #include "blue.h"
+#include "gpio.h"
 #include "led.h"
 
 #define	BTMOUSE_BUTTON1	(1 << 0)
@@ -86,10 +87,7 @@ void hidh_callback(void *handler_args, esp_event_base_t base, int32_t id, void *
 
 	switch (event) {
         case ESP_HIDH_OPEN_EVENT: {
-			bda = esp_hidh_dev_bda_get(param->open.dev);
-            ESP_LOGI(TAG, "opened connection with " ESP_BD_ADDR_STR, ESP_BD_ADDR_HEX(bda));
-			esp_hidh_dev_dump(param->open.dev, stdout);
-            xTaskNotify(t_blue, LED_ON, eSetValueWithOverwrite);
+            blue_open(param);
 			break;
 		}
 		case ESP_HIDH_BATTERY_EVENT: {
@@ -157,8 +155,17 @@ void blue_init(void)
 	xTaskCreatePinnedToCore(&blue_scan, "hid_task", 6 * 1024, NULL, 2, NULL, 0);
 }
 
-void blue_scan(void *pvParameters)
-{
+void blue_open(esp_hidh_event_data_t *p) {
+    const uint8_t *bda = NULL;
+
+    bda = esp_hidh_dev_bda_get(p->open.dev);
+    ESP_LOGI(TAG, "opened connection with " ESP_BD_ADDR_STR, ESP_BD_ADDR_HEX(bda));
+    esp_hidh_dev_dump(p->open.dev, stdout);
+    xTaskNotify(t_blue, LED_ON, eSetValueWithOverwrite);
+    gpio_output_enable();
+}
+
+void blue_scan(void *pvParameters) {
     size_t len = 0;
     esp_hid_scan_result_t *mouse = NULL;
     esp_hid_scan_result_t *results = NULL;
@@ -186,13 +193,12 @@ void blue_scan(void *pvParameters)
             }
             r = r->next;
         }
-        if (mouse) {
-            // try to connect to the last mouse found
+
+        // try to connect to the last mouse found
+        if (mouse)
             esp_hidh_dev_open(mouse->bda, mouse->transport, mouse->ble.addr_type);
-        }
-        else {
+        else
             ESP_LOGI(TAG, "devices found but no mouse detected");
-        }
 
         esp_hid_scan_results_free(results);
     }
diff --git a/main/blue.h b/main/blue.h
index 129a317..d28f78d 100644
--- a/main/blue.h
+++ b/main/blue.h
@@ -30,6 +30,7 @@
 
 /* prototypes */
 void	blue_init(void);
+void    blue_open(esp_hidh_event_data_t *p);
 void    blue_scan(void *pvParameters);
 
 /* global variables for tasks handles */
diff --git a/main/gpio.c b/main/gpio.c
index 5b32e9f..ed376a0 100644
--- a/main/gpio.c
+++ b/main/gpio.c
@@ -43,6 +43,16 @@ void	gpio_init(void) {
 	gpio_set_direction(GPIO_YELLOWLED, GPIO_MODE_OUTPUT);
 	gpio_set_direction(GPIO_REDLED, GPIO_MODE_OUTPUT);
     
+    /* External chips */
+    gpio_reset_pin(GPIO_OE);
+    gpio_set_direction(GPIO_OE, GPIO_MODE_OUTPUT);
+
+    /* Modes */
+    gpio_reset_pin(GPIO_ADBSRC);
+    gpio_reset_pin(GPIO_BTOFF);
+    gpio_set_direction(GPIO_ADBSRC, GPIO_MODE_INPUT);
+    gpio_set_direction(GPIO_BTOFF, GPIO_MODE_INPUT);
+
     /* Quadrature mouse */
     gpio_reset_pin(GPIO_CLICK);
     gpio_reset_pin(GPIO_QX1);
@@ -57,3 +67,11 @@ void	gpio_init(void) {
     
     gpio_set_level(GPIO_CLICK, 1);
 }
+
+void    gpio_output_disable(void) {
+    gpio_set_level(GPIO_OE, 0);
+}
+
+void    gpio_output_enable(void) {
+    gpio_set_level(GPIO_OE, 1);
+}
diff --git a/main/gpio.h b/main/gpio.h
index e1466a5..6580acb 100644
--- a/main/gpio.h
+++ b/main/gpio.h
@@ -27,6 +27,8 @@
 
 /* prototypes */
 void	gpio_init(void);
+void    gpio_output_disable(void);
+void    gpio_output_enable(void);
 
 /* GPIO pins definitions
  *
@@ -49,16 +51,21 @@ void	gpio_init(void);
  * - GPIO17
  */
 
-#define GPIO_ADB	4
-#define GPIO_CLICK	2
-#define GPIO_QX1	12
-#define GPIO_QX2	13
-#define GPIO_QY1	14
-#define GPIO_QY2	15
+#define GPIO_ADB	    4
+#define GPIO_CLICK	    2
+#define GPIO_QX1	    12
+#define GPIO_QX2	    13
+#define GPIO_QY1	    14
+#define GPIO_QY2        15
+
+#define GPIO_OE         22
+#define GPIO_ADBSRC     32
+#define GPIO_BTOFF      33
 
 #define GPIO_GREENLED	21
 #define GPIO_BLUELED	25
 #define GPIO_YELLOWLED	26
-#define GPIO_REDLED	27
+#define GPIO_REDLED	    27
+
 #endif
 
diff --git a/main/main.c b/main/main.c
index 187c8ba..aeb3160 100644
--- a/main/main.c
+++ b/main/main.c
@@ -27,6 +27,7 @@
 #include "sdkconfig.h"
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
+#include "esp_hidh.h"
 #include "esp_log.h"
 #include "esp_system.h"
 #include "esp_spi_flash.h"
@@ -57,5 +58,14 @@ void app_main(void)
 
 	gpio_init();
 	led_init();
-	blue_init();
+
+    /* Check /BTOFF and enable bluetooth if needed */
+    if (gpio_get_level(GPIO_BTOFF) == 1)
+        blue_init();
+
+    /* Blink error if no inputs (/BTOFF and no /ADBSRC) */
+    if (gpio_get_level(GPIO_BTOFF) == 0 && gpio_get_level(GPIO_ADBSRC) == 1) {
+        ESP_LOGE(TAG, "Bluetooth is off and ADB is in device mode!");
+        xTaskNotify(t_red, LED_SLOW, eSetValueWithOverwrite);
+    }
 }