diff --git a/1_Basic_GPIO/blinky.md b/1_Basic_GPIO/blinky.md
deleted file mode 100644
index 5c6d90d..0000000
--- a/1_Basic_GPIO/blinky.md
+++ /dev/null
@@ -1,50 +0,0 @@
-## Blinky
-
-The classic, the helloWorld of embedded programming. This program turns the LED on and off periodically.
-
-### Initial steps: 
-- Create new project with project generator.
-- Open the project folder in VSCode.
-- Build the project by pressing the `build` button at the bottom and select the option with `arm-none-eabi`.
-- Make sure the build exits with code 0.
-
-<img src="https://c.l3n.co/i/OW219o.png" width="300">
-
-### Basic Code:
-
-``` C
-int main()
-{
-    stdio_init_all();
-
-    const uint OnBoardLED = PICO_DEFAULT_LED_PIN;
-    gpio_init(OnBoardLED);
-    gpio_set_dir(OnBoardLED, GPIO_OUT);
-    while (true){
-        gpio_put(OnBoardLED, true);
-        sleep_ms(500);
-        gpio_put(OnBoardLED, false);
-        sleep_ms(500);
-    }
-}
-```
-
-#### Explanation:
-`stdio_init_all()`: initialize stuff
-
-`OnBoardLED = PICO_DEFAULT_LED_PIN`: Get the GPIO number of onboard LED. Remember this is GPIO Number, NOT PIN NUMBER.
-
-`gpio_init(OnBoardLED)`: Initialize that GPIO pin.
-
-`gpio_set_dir(OnBoardLED, GPIO_OUT)`: Set GPIO direction (`GPIO_OUT` for writing and `GPIO_IN` for reading).
-
-`while (true){}`: Super loop of the program
-
-`gpio_put(OnBoardLED, true)`: Set `OnBoardLED` pin to `on` (`true` to turn on/set to high/voltage to VDD, `false` to turn off/set to low/voltage to GND)
-
-Pico logic HIGH voltage is 3.3v and LOW voltage is 0v.
-
-`sleep_ms(500)`: sleep for 500ms.
-
----
-
diff --git a/1_Basic_GPIO/digitalOut.md b/1_Basic_GPIO/digitalOut.md
new file mode 100644
index 0000000..1995b51
--- /dev/null
+++ b/1_Basic_GPIO/digitalOut.md
@@ -0,0 +1,91 @@
+## Blinky
+
+The classic, helloWorld of embedded programming. This program turns the LED on and off periodically.
+
+### Initial steps:
+- Create new project with project generator.
+- Open the project folder in VSCode.
+- Build the project by pressing the `build` button at the bottom and select the option with `arm-none-eabi`.
+- Make sure the build exits with code 0.
+
+<img src="https://c.l3n.co/i/OW219o.png" width="300">
+
+### Basic Code:
+
+``` C
+int main()
+{
+    stdio_init_all();
+
+    const uint OnBoardLED = PICO_DEFAULT_LED_PIN;
+    gpio_init(OnBoardLED);
+    gpio_set_dir(OnBoardLED, GPIO_OUT);
+    while (true){
+        gpio_put(OnBoardLED, true);
+        sleep_ms(500);
+        gpio_put(OnBoardLED, false);
+        sleep_ms(500);
+    }
+}
+```
+
+#### Explanation:
+`stdio_init_all()`: initialize stuff
+
+`OnBoardLED = PICO_DEFAULT_LED_PIN`: Get the GPIO number of onboard LED. Remember: this is GPIO Number, NOT PIN NUMBER.
+
+`gpio_init(OnBoardLED)`: Initialize that GPIO pin.
+
+`gpio_set_dir(OnBoardLED, GPIO_OUT)`: Set GPIO direction (`GPIO_OUT` for writing and `GPIO_IN` for reading).
+
+`while (true){}`: Super loop of the program
+
+`gpio_put(OnBoardLED, true)`: Set `OnBoardLED` pin to `on` (`true` to turn on/set to high/voltage to VDD, `false` to turn off/set to low/voltage to GND)
+
+Pico logic HIGH voltage is 3.3v and LOW voltage is 0v.
+
+`sleep_ms(500)`: sleep for 500ms.
+
+---
+
+## Different Blinky
+
+This makes the pico blink like a beacon, 2 short blinks followed by long delay. A `for` loop is used for repeating the short blink twice.
+
+```c
+for (int i = 0; i < 2; i++)
+{
+    gpio_put(OnBoardLED, true);
+    sleep_ms(50);
+    gpio_put(OnBoardLED, false);
+    sleep_ms(100);
+}
+sleep_ms(500);
+```
+
+---
+
+## External Blinky
+
+This program blinks an LED connected to one of the GPIO(General Purpose Input/Output) ports.
+
+For this example, I used Pin 20 == GP15. I connected a resistor to this pin and connected an LED in series with the resistor to the ground, as shown in the image below.
+
+```c
+const uint LEDPin = 15;
+gpio_init(LEDPin);
+gpio_set_dir(LEDPin, GPIO_OUT);
+while (true)
+{
+    for (int i = 0; i < 2; i++)
+    {
+        gpio_put(LEDPin, true);
+        sleep_ms(50);
+        gpio_put(LEDPin, false);
+        sleep_ms(100);
+    }
+    sleep_ms(500);
+}
+```
+
+The only change here is in line 1, `PICO_DEFAULT_LED_PIN` is changed to `15`, to represent GP15. Remember: in the program, a GPIO pin is represented by the GP number and NOT by the pin number, as shown in the [Pico's Pinout](https://pico.pinout.xyz/).