Fit and configure the **distance sensor add-on** for your **Marty V2**, then use it in Blocks.

{{ :martyv2:userguides:sensorsandaddons:distance_sensor.jpg?nolink&400 |Marty V2 distance sensor add-on}}

**Firmware requirement:** this add-on requires version **0.0.124 or later**. Use the [[:martyv2:userguides:app|Robotical app]] to check for available updates.

You will need:

  * A mounted distance sensor and its cable.
  * A Marty V2.

===== Building and Attaching the Distance Sensor Chin Mount =====

Follow this video to build the chin mount and attach the sensor to Marty:

{{ youtube>MgGN8LC3h2A?medium }}

===== Building and Attaching the Distance Sensor Head Mount =====

Alternatively, follow this video to build and attach the head mount:

{{ youtube>9hH2Ai5ODEM?medium }}

===== Configuring the Distance Sensor =====

Use the Robotical app to check that the sensor is connected and give it a recognisable name:

  - Open the [[:martyv2:userguides:app|Robotical app]] and connect to Marty.
  - Open **Robot settings → Add-ons** to reach **Manage Add-ons**.
  - Find the connected distance sensor and select its row or gear icon to expand its details.
  - Enter **DistanceSensor** in **Name this add-on**, then choose **Update Name**.

`DistanceSensor` uses capital **D** and **S**, with no space between the words. This is the recommended name used in this guide; current Blocks can identify the distance sensor without requiring that exact name.

Return to **Home → Blocks** to start programming with the sensor. See the [[:martyv2:userguides:martyblocks:start|Blocks guide]] if you need help getting started.