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----
-layout: page
-title: "Development tutorial"
-description: "Tutorial about the first steps on Home Assistant development"
-date: 2016-02-20 07:00
-sidebar: false
-comments: false
-sharing: true
-footer: true
----
-
-This is a simple tutorial on how to write a component for [Home Assistant](https://home-assistant.io/). We will work on a component called "information". The purpose of this component is to display a given text in the frontend. 
-
-The setup of a development environment is described in the [Developers section](/developers/#starting-development) of the documentation.
-
-## {% linkable_title Component %}
-
-
-As a start, create a file `information.py` in your Git checkout of Home Assistant in the folder `homeassistant/component/`.
-
-```python
-"""
-homeassistant.components.information
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-The information component allows to show text in the frontend.
-
-For more details about this component, please refer to the documentation at
-https://home-assistant.io/components/information/
-"""
-import logging
-
-_LOGGER = logging.getLogger(__name__)
-
-DOMAIN = 'information'
-DEPENDENCIES = []
-
-def setup(hass, config=None):
-    """ Setup the Information component. """
-
-    _LOGGER.info("The 'information' component is ready!")
-
-    return True
-```
-
-1. In the file header we decided to add some details. Like the path, a short description, and the link to the documentation. 
-2. We want to do some logging. This means that we import the Python logging module and create an alias.
-3. The component name is equal to the domain name.
-4. At the moment this component has no dependencies. For detail check [dependencies](/developers/creating_components/#dependencies) section.
-5. The `setup` function will take care of the initialization of our component.
-   The component will only write a log message. Keep in mind for later that you have several options for the severity:
-
-   - _LOGGER.info(msg)
-   - _LOGGER.warning(msg)
-   - _LOGGER.error(msg)
-   - _LOGGER.critical(msg)
-   - _LOGGER.exception(msg)
-
-7. We return `True` if everything is ok.
-
-Add the component to your `configuration.yaml` file.
-
-```yaml
-information:
-```
-
-If you replace `_LOGGER.info("The 'information' component is ready!")` with or add
-
-```python
-hass.states.set('information.Text', 'Info component')
-```
-
-then the component will not be different to the sample included in the `config/custom_components` folder or shown as an [example](/cookbook/python_component_basic_state/). After a start or a restart of Home Assistant the component will be visible in the frontend.
-
-<p class='img'>
-<img src='/images/screenshots/create-component01.png' />
-</p>
-
-The next step is the introduction of configuration options. Most configuration details are coming out of the `configuration.yaml` file. To do that we need to update the  `def setup()` method to accept configuration information and access the configuration variable in the `setup` method.
-
-More details about this topic can be found in the [User given configuration](/developers/creating_components/#config-user-given-configuration) section.
-
-```python
-import logging
-
-_LOGGER = logging.getLogger(__name__)
-
-DOMAIN = 'information'
-DEPENDENCIES = []
-CONF_NAME = 'text'
-
-def setup(hass, config):
-    """ Setup the Information component. """
-
-    test = config[DOMAIN].get(CONF_NAME, DEFAULT_NAME)
-    hass.states.set('information.Text', test)
-
-    return True
-```
-
-To add the latest feature of our component, update the entry in your `configuration.yaml` file.
-
-```yaml
-information:
-  text: 'Sample text'
-```
-
-It's important to check if all mandatory configuration variables are provided. If not, the setup should fail. We will use the `validate_config` as a helper to archive this. The next listing shows the essential parts.
-
-```python
-from homeassistant.helpers import validate_config
-[...]
-    if not validate_config(config, {DOMAIN: ['text']}, _LOGGER):
-        return False
-```
-
-## {% linkable_title Frontend %}
-
-So far our new component is rendered as a default compoment in the frontend. But we want our own view of the component in the frontend. We assume that you have setup the (frontend development)[/developers/frontend/] already.
-
-We need two new files in the folder `src/cards/`:
-
-- ha-information-card.html
-- ha-information-card.js
-
-
-TBD
-
-Rebuild the frontend.
-
-```bash
-$ script/build_frontend
-```
-
-Change the [http](/components/http/) component to load the `development` version of the frontend as also mentioned in the [ Setting up the environment](/developers/frontend/#setting-up-the-environment) section of the (frontend development)[/developers/frontend/] page.
-
-```yaml
-http:
-  development: 1
-```
-