diff --git a/main/CMakeLists.txt b/main/CMakeLists.txt
index 6efbde8..179b749 100644
--- a/main/CMakeLists.txt
+++ b/main/CMakeLists.txt
@@ -1,6 +1,7 @@
 set(srcs "blue.c"
          "esp_hid_gap.c"
 	 "gpio.c"
+	 "led.c"
 	 "main.c")
          
 set(include_dirs ".")
diff --git a/main/gpio.c b/main/gpio.c
index 75e977c..1f5461b 100644
--- a/main/gpio.c
+++ b/main/gpio.c
@@ -17,12 +17,13 @@
 #include "gpio.h"
 
 void	gpio_init(void) {
-	gpio_reset_pin(GREENLED_GPIO);
-	gpio_set_direction(GREENLED_GPIO, GPIO_MODE_OUTPUT);
-
-	/* do a half second blink for debug mode */
-	gpio_set_level(GREENLED_GPIO, 1);
-	vTaskDelay(500 / portTICK_PERIOD_MS);
-	gpio_set_level(GREENLED_GPIO, 0);
-	vTaskDelay(500 / portTICK_PERIOD_MS);
+	/* LEDs */
+	gpio_reset_pin(GPIO_GREENLED);
+	gpio_reset_pin(GPIO_BLUELED);
+	gpio_reset_pin(GPIO_YELLOWLED);
+	gpio_reset_pin(GPIO_REDLED);
+	gpio_set_direction(GPIO_GREENLED, GPIO_MODE_OUTPUT);
+	gpio_set_direction(GPIO_BLUELED, GPIO_MODE_OUTPUT);
+	gpio_set_direction(GPIO_YELLOWLED, GPIO_MODE_OUTPUT);
+	gpio_set_direction(GPIO_REDLED, GPIO_MODE_OUTPUT);
 }
diff --git a/main/gpio.h b/main/gpio.h
index fc4d945..f0ddaf5 100644
--- a/main/gpio.h
+++ b/main/gpio.h
@@ -56,9 +56,9 @@ void	gpio_init(void);
 #define QY1_GPIO	14
 #define QY2_GPIO	15
 
-#define GREENLED_GPIO	21
-#define BLUELED_GPIO	25
-#define YELLOWLED_GPIO	26
-#define REDLED_GPIO	27
+#define GPIO_GREENLED	21
+#define GPIO_BLUELED	25
+#define GPIO_YELLOWLED	26
+#define GPIO_REDLED	27
 #endif
 
diff --git a/main/led.c b/main/led.c
new file mode 100644
index 0000000..61ed8cc
--- /dev/null
+++ b/main/led.c
@@ -0,0 +1,45 @@
+/* Hello World Example
+
+   This example code is in the Public Domain (or CC0 licensed, at your option.)
+
+   Unless required by applicable law or agreed to in writing, this
+   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+   CONDITIONS OF ANY KIND, either express or implied.
+ */
+#include <stdio.h>
+#include "driver/gpio.h"
+#include "sdkconfig.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_system.h"
+#include "esp_spi_flash.h"
+
+#include "led.h"
+#include "gpio.h"
+
+void	led_init(void) {
+	BaseType_t	r;
+	TaskHandle_t	green, blue, yellow, red;
+
+	/* blink allds LEDs once */
+	gpio_set_level(GPIO_GREENLED, 1);
+	gpio_set_level(GPIO_BLUELED, 1);
+	gpio_set_level(GPIO_YELLOWLED, 1);
+	gpio_set_level(GPIO_REDLED, 1);
+	vTaskDelay(125 / portTICK_PERIOD_MS);
+	gpio_set_level(GPIO_GREENLED, 0);
+	gpio_set_level(GPIO_BLUELED, 0);
+	gpio_set_level(GPIO_YELLOWLED, 0);
+	gpio_set_level(GPIO_REDLED, 0);
+
+	r = xTaskCreate(led_task, "GREEN", 1024, (void *) GPIO_GREENLED, tskIDLE_PRIORITY, &green);
+}
+
+void	led_task(void *pvParameters) {
+	while (1) {
+		gpio_set_level(GPIO_GREENLED, 1);
+		vTaskDelay(75 / portTICK_PERIOD_MS);
+		gpio_set_level(GPIO_GREENLED, 0);
+		vTaskDelay(75 / portTICK_PERIOD_MS);
+	}
+}
diff --git a/main/led.h b/main/led.h
new file mode 100644
index 0000000..5c508f6
--- /dev/null
+++ b/main/led.h
@@ -0,0 +1,33 @@
+/*
+ *  led.h
+ *  quack
+ *
+ *  Created by Michel DEPEIGE on 15/12/2020.
+ *  Copyright (c) 2020 Michel DEPEIGE.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (see the file COPYING); if not, write to the
+ * Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
+ *
+ */
+
+#ifndef LED_H
+#define LED_H
+
+/* prototypes */
+void	led_init(void);
+void    led_task(void *pvParameters);
+
+#endif
+
diff --git a/main/main.c b/main/main.c
index 9ff00f0..a23c817 100644
--- a/main/main.c
+++ b/main/main.c
@@ -16,6 +16,7 @@
 #include "esp_spi_flash.h"
 
 #include "blue.h"
+#include "led.h"
 #include "gpio.h"
 
 static const char* TAG = "quack";
@@ -38,5 +39,6 @@ void app_main(void)
 	ESP_LOGI(TAG, "Minimum free heap size: %d bytes", esp_get_minimum_free_heap_size());
 
 	gpio_init();
+	led_init();
 	blue_init();
 }
diff --git a/sdkconfig b/sdkconfig
index 8c756c7..7d9a7b2 100644
--- a/sdkconfig
+++ b/sdkconfig
@@ -91,9 +91,9 @@ CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y
 # CONFIG_ESPTOOLPY_FLASHSIZE_16MB is not set
 CONFIG_ESPTOOLPY_FLASHSIZE="4MB"
 CONFIG_ESPTOOLPY_FLASHSIZE_DETECT=y
-CONFIG_ESPTOOLPY_BEFORE_RESET=y
-# CONFIG_ESPTOOLPY_BEFORE_NORESET is not set
-CONFIG_ESPTOOLPY_BEFORE="default_reset"
+# CONFIG_ESPTOOLPY_BEFORE_RESET is not set
+CONFIG_ESPTOOLPY_BEFORE_NORESET=y
+CONFIG_ESPTOOLPY_BEFORE="no_reset"
 CONFIG_ESPTOOLPY_AFTER_RESET=y
 # CONFIG_ESPTOOLPY_AFTER_NORESET is not set
 CONFIG_ESPTOOLPY_AFTER="hard_reset"