> ## Documentation Index
> Fetch the complete documentation index at: https://docs.voltic.one/llms.txt
> Use this file to discover all available pages before exploring further.

# Install PIR Presence Sensors (Bedroom and Bathroom)

> Install Voltic PIR motion sensors on the ceiling of the bedroom and bathroom to automate HVAC by presence.

Voltic PIR motion sensors detect the presence of people in the room and automatically activate or deactivate HVAC. With this installation, the need for traditional key cards is eliminated and the hotel's energy consumption is optimized.

## Identification

The inner packaging label indicates the installation zone:

* **D** = Bedroom (Dormitorio)
* **B** = Bathroom (Bano)
* **S** = Living room (Salon)
* **T** = Hallway (Distribuidor)

## Bedroom sensor

### Placement

* Always install on the **ceiling**.
* Horizontal position, in the center of the space.
* Clear area, without obstacles blocking the field of view.
* Avoid windows with direct light, heat sources, and ventilation grilles.

### Coverage

* Recommended height: 2.20 to 2.50 m.
* Detection angle: 120 degrees.
* Range: up to 9 m.

### Mounting

Fix the sensor **only with screws**. Do not use adhesive on the ceiling.

![bedroom cover placement](https://r2.voltic.es/media/installation-docs-assets/devices/pir/bed/colocacion-tapa-pir-dormitorio.webp)

![bedroom mounting diagram](https://r2.voltic.es/media/installation-docs-assets/devices/pir/bed/pir_fijacion.webp)

![bedroom real mounting](https://r2.voltic.es/media/installation-docs-assets/devices/pir/bed/atornillar-pir-dormitorio.webp)

![bedroom positioning 1](https://r2.voltic.es/media/installation-docs-assets/devices/pir/bed/pir_dormitorio_colocacion_1.webp)

![bedroom error](https://r2.voltic.es/media/installation-docs-assets/devices/pir/bed/pir_error_colocacion.webp)

### Common mistakes in the bedroom

<AccordionGroup>
  <Accordion title="Installing on the wall instead of ceiling">
    The sensor must go on the ceiling to properly cover the room's surface.
  </Accordion>

  <Accordion title="Placement near heat sources">
    A radiator, lamp, or HVAC grille can cause false detections.
  </Accordion>

  <Accordion title="Obstructing the field of view">
    Curtains, blinds, or tall furniture can reduce the effective detection area.
  </Accordion>
</AccordionGroup>

## Bathroom sensor

### Placement

* Always install on the **ceiling**.
* Horizontal position, in the center of the space.
* Clear area, without obstacles.
* Avoid direct light and heat sources.
* Do not install near the shower or extractor, as steam and air currents can affect detection.

### Coverage

* Recommended height: 2.20 to 2.50 m.
* Detection angle: 120 degrees.
* Range: up to 9 m.

### Mounting

Fix the sensor **only with screws**. Do not use adhesive on the ceiling.

![bathroom positioning](https://r2.voltic.es/media/installation-docs-assets/devices/pir/bath/pir_ba%C3%B1o_colocacion.webp)

![bathroom error](https://r2.voltic.es/media/installation-docs-assets/devices/pir/bath/pir_error_colocacion.webp)

### Common mistakes in the bathroom

<AccordionGroup>
  <Accordion title="Installing near the shower">
    Steam and splashes can damage the sensor and cause incorrect readings.
  </Accordion>

  <Accordion title="Installing near the extractor">
    Air currents from the extractor can confuse the PIR sensor and generate unwanted activations.
  </Accordion>

  <Accordion title="Using adhesive on the ceiling">
    Bathroom humidity reduces adhesion. Always use screws.
  </Accordion>
</AccordionGroup>

## Power supply

The sensor runs on 2 included AA batteries. Open the compartment and verify polarity before closing it.

## Verification

The sensor's LED blinks when detecting motion. If it does not react:

* Check that the batteries are properly placed and charged.
* Check that there are no obstacles blocking the field of view.
* Verify Zigbee network coverage in the area.
* Sync the sensor on [app.voltic.es](https://app.voltic.es) if it does not appear on the platform.

## Related articles

* [Contact sensors](/en/installation/contact-sensors)
* [Sensor operation](/en/operation/sensors)


## Related topics

- [Voltic Device Installation Guide](/en/installation/index.md)
- [How Sensors Work in Voltic Smart Room Control](/en/operation/sensors.md)
- [Frequently Asked Questions About the Voltic System](/en/support/faq.md)