# Hello World

```{image} hello_world.png
:alt: Rendering of the hello_world example
:class: example-render
```

The smallest useful config: a single screen showing "Hello, World!" centered on the panel. It uses no
data sources and no custom fonts (text falls back to the bundled FiraSans).

## Files

- `hello_world.yml` — the config. Sets the panel size and schedules the `hello` screen.
- `hello_world.xml.jinja` — the screen template.

## Try it

From the `web/` directory, point `CONFIG_DIR` at this folder and render the config to a PNG:

```sh
CONFIG_DIR=examples/hello_world uv run todays_paper hello_world -o hello_world.png
```

To serve it to a device, name the config file after the device's UUID (e.g. `<uuid>.yml`) and run the
server with `CONFIG_DIR` pointing at this folder.

## Source

### `hello_world.xml.jinja`

````xml+jinja
<screen>
    <text align="center" valign="middle" size="120">Hello, World!</text>
</screen>
````

### `hello_world.yml`

````yaml
# The simplest possible config: one screen, no data sources.

settings:
  timezone: Europe/Stockholm

screens:
  # Panel resolution. Use 1024x758 for an ED060XC3 panel, 1448x1072 for an ED060KC1 panel.
  width: 1024
  height: 758
  rotate: 0
  hello:
    template: hello_world.xml.jinja

scheduler:
  # Show the same screen all week, re-rendered every midnight.
  - days: [1, 2, 3, 4, 5, 6, 7]
    hour: 0
    screen: hello
````