# HMI Charts
**HMI Charts** are [HMI components](https://docs.robpod.cloud/hmi-designer/hmi-components) that can be used to show data in a graphical way. Chart visualization is updated automatically at runtime based on values of linked robot variables.
Supported chart types are: Time series, Bar / Histogram, Pie / Circle, Indicator.
### Adding a Chart
Charts can be added to a panel using the  button inside the [HMI Palette Toolbar](https://docs.robpod.cloud/hmi-designer/user-interface).
Then use the side HMI Component Properties panel to configure the chart and its appearance, like for example the chart type and its colors.
### Linking a Chart
HMI charts are linked to robot variables using **Chart Data Seires.**
Data series can be added and edited using the side Component Properties panel. Each chart can have any number of data series, and each data series is linked to a **robot variable**, for which name and type must be specified.
Valid linking examples for Universal Robots:
* ```python
my_variable # user defined variable
```
* ```python
get_standard_digital_in(0) # robot function
```
* ```python
my_function() # user defined function
```
* ```python
x + y # command with return value
```
{% tabs %}
{% tab title="Universal Robots" %}
{% embed url="" %}
HMI Chart Tutorial
{% endembed %}
{% endtab %}
{% tab title="Doosan Robotics" %}
{% embed url="" %}
HMI Chart Tutorial
{% endembed %}
{% endtab %}
{% endtabs %}
### Exporting Data
When you are connected with the [Remote Desktop Viewer](https://docs.robpod.cloud/hmi-designer/desktop-hmi-viewer) to a running Robpod HMI application, you can export and save chart data.
Right click on the chart, then choose:
* **Save as**, to save the chart as a png or jpeg image
* **Export**, to export data in CSV format.
Images and data will be available on your desktop PC for later usage.
{% embed url="" %}
