+ + Development 101 +
++
The goal of development 101 is to get you familiar with the basics of developing for Home Assistant. Before we start, please make sure you familiarize yourself with the architecture.
+To get our code running inside Home Assistant we’re going to create a custom component. The first step is to locate your config folder. You can find the path to your config folder by opening the Home Assistant frontend, click on the 
. It’s the path after the text “Path to configuration.yaml”.
Inside your configuration directory create a new folder called custom_components. It might be that one already exists, that’s fine too. This is the folder that Home Assistant will look at when looking for custom code.
+The Home Assistant API has two variants: a synchronous and an asynchronous version (asyncio). This development course will focus on the synchronous version. +
+To verify that everything is working correctly, let’s create a small Hello World component. To do so, create a file called hello_world.py in your custom components folder. Copy paste the following content to it:
# The domain of your component. Equal to the filename of your component.
+DOMAIN = "hello_world"
+
+
+def setup(hass, config):
+ """Setup the hello_world component."""
+ # States are in the format DOMAIN.OBJECT_ID.
+ hass.states.set('hello_world.Hello_World', 'Works!')
+
+ # Return boolean to indicate that initialization was successfully.
+ return True
+