> For the complete documentation index, see [llms.txt](https://help.movin3d.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.movin3d.com/movin-tracin-stage/install-the-hardware/sensor-mounting.md).

# Mounting the sensors

Where to mount the four LiDAR sensors around the stage: 3-5 m above the floor facing down, mid-side or corner layout, required overlap, and cabling.

Four sensors hang high around the stage. Clamp them to the truss if there is one; otherwise put them on light stands.

Either way, mount them **3–5 m** above the floor with the **LiDAR facing down**. See [What you need](/movin-tracin-stage/install-the-hardware/whats-included.md) for the parts list.

<figure><img src="https://1990205953-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FsiYoXLAF78e1PzseNXtd%2Fuploads%2Fgit-blob-d992ff159b89ece97fc013e478669b44fd88122d%2Fsensor-placement.png?alt=media" alt="Sensors clamped to truss and sensors on light stands, both at a mounting height of 3 to 5 m"><figcaption><p>Top: clamped to truss. Bottom: on light stands.</p></figcaption></figure>

## Where to place them

Mark out the capture area as a rectangle and put one sensor at the middle of each side, or at the four corners when that is not possible.

<figure><img src="https://1990205953-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FsiYoXLAF78e1PzseNXtd%2Fuploads%2Fgit-blob-32fd39a6232a50945fdac31df2b6977dd7a07731%2Fsensor-layout.png?alt=media" alt="Sensor layout seen from above — mid-side (recommended) and corners, plus the minimum and maximum capture area"><figcaption><p>Sensor layout and capture-area limits.</p></figcaption></figure>

* **Height** — **3–5 m (10–16 ft)** above the stage floor.
* **Overlap** — neighboring sensors must see overlapping ground. During calibration the wand has to be visible to two or more sensors at once for the alignment to work.
* **Clear line of sight** — keep speakers, lighting fixtures, set pieces, and drapes out of the way. Anything blocked is not captured.

## How to mount

1. Set up the stand and spread its legs wide. Skip this step when rigging to truss.
2. Grip the super clamp onto the stand pole or truss pipe and tighten it firmly.
3. On a stand, fit the 90° mount to the clamp so the sensor can face down. On truss the clamp is used as it is.
4. Fit the stud and screw the sensor's 3/8 inch hole onto it. Check that the **LiDAR faces down** and sits level.
5. Plug the network cable into the sensor, run it down along the stand, and secure it with cable ties, leaving a little slack just below the sensor.

When rigging to truss, attach a safety cable if you have one.

<figure><img src="https://1990205953-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FsiYoXLAF78e1PzseNXtd%2Fuploads%2Fgit-blob-b7df38895e6211ef6667114afd2f1f1923ab33cf%2Fsensor-mount-head.jpg?alt=media" alt="A LiDAR sensor held facing down on a mount by a stud" width="320"><figcaption><p>On the stud — the LiDAR faces down.</p></figcaption></figure>

<figure><img src="https://1990205953-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FsiYoXLAF78e1PzseNXtd%2Fuploads%2Fgit-blob-a461c8b5f947523ba4ba4eba2e0d3735ae37a251%2Fsensor-mount-stand.jpg?alt=media" alt="A LiDAR sensor hanging from a clamp on top of a light stand" width="320"><figcaption><p>Clamped to a light stand.</p></figcaption></figure>

## Cabling

The sensor has no power adapter. The network cable from the PoE switch carries both power and data, so the sensor turns on as soon as it is plugged into a PoE port on a powered switch. If the switch is off, the sensors are off.

<figure><img src="https://1990205953-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FsiYoXLAF78e1PzseNXtd%2Fuploads%2Fgit-blob-5b1b5dd852b20e82f9bd5a006498f90cf122a8ae%2Fsensor-cable-switch.jpg?alt=media" alt="Four sensor cables in the supplied switch&#x27;s PoE ports"><figcaption><p>One cable per sensor into the PoE ports; the port on the right goes to the server.</p></figcaption></figure>

1. Run each sensor's cable down to the switch supplied with the system and plug it into any **PoE port** — the numbered group on the left. The PoE light for that port comes on once the sensor is powered.
2. Join the switch to the server with one more cable: use port **17** or **18** on the right — those two do not supply power — and plug the other end into the server's **LIDAR** port.

Next, [connect the monitor, keyboard, and mouse to the server, then power on](/movin-tracin-stage/install-the-hardware/server-back.md).

{% hint style="warning" %}
Calibration is computed from where the sensors sit. If a sensor is moved, or a stand drifts during a show, tracked positions shift — keep stands out of walkways.
{% endhint %}


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