This is the interactive blink tutorial using `Wokwi`_. For this tutorial, you don't need the ESP32 board or the Arduino toolchain.
.. note:: If you don't want to use this tutorial with the simulation, you can copy and paste the :ref:`blink_example_code` from `Wokwi`_ editor and use it on the `Arduino IDE`_ or `PlatformIO`_.
About this Tutorial
-------------------
This tutorial is the most basic for any get started. In this tutorial, we will show how to set a GPIO pin as an output to drive a LED to blink each 1 second.
Step by step
------------
In order to make this simple blink tutorial, you'll need to do the following steps.
1. **Define the GPIO for the LED.**
.. code-block::
#define LED 2
This ``#define LED 2`` will be used to set the GPIO2 as the ``LED`` output pin.
2. **Setup.**
Inside the ``setup()`` function, we need to add all things we want to run once during the startup.
Here we'll add the ``pinMode`` function to set the pin as output.
.. code-block::
void setup() {
pinMode(LED, OUTPUT);
}
The first argument is the GPIO number, already defined and the second is the mode, here defined as an output.
3. **Main Loop.**
After the ``setup``, the code runs the ``loop`` function infinitely. Here we will handle the GPIO in order to get the LED blinking.
.. code-block::
void loop() {
digitalWrite(LED, HIGH);
delay(100);
digitalWrite(LED, LOW);
delay(100);
}
The first function is the ``digitalWrite()`` with two arguments:
* GPIO: Set the GPIO pin. Here defined by our ``LED`` connected to the GPIO2.
* State: Set the GPIO state as HIGH (ON) or LOW (OFF).
This first ``digitalWrite`` we will set the LED ON.
After the ``digitalWrite``, we will set a ``delay`` function in order to wait for some time, defined in milliseconds.
Now we can set the GPIO to ``LOW`` to turn the LED off and ``delay`` for more few milliseconds to get the LED blinking.
4. **Run the code.**
To run this code, you'll need a development board and the Arduino toolchain installed on your computer. If you don't have both, you can use the simulator to test and edit the code.
Simulation
----------
This simulator is provided by `Wokwi`_ and you can test the blink code and play with some modifications to learn more about this example.
