Zigbee Presence Sensor with Radar for Smart Building & HVAC Automation

Introduction

Many Zigbee presence sensors fail to detect occupants who remain still, leading to poor HVAC performance and wasted energy in smart buildings. A radar-based zigbee presence sensor solves this problem by providing accurate, real-time human detection—even when there is no movement.

OWON’s OPS305 ceiling-mount Zigbee presence sensor adopts advanced Doppler radar technology to detect micro-movements such as breathing or slight posture changes. It is ideal for offices, meeting rooms, hotels, and commercial building automation projects.

Designed for modern automation platforms such as Home Assistant, the OPS305 enables scalable and reliable presence detection for smart building and HVAC systems.

Zigbee Presence Sensor vs PIR Motion Sensor

Zigbee presence sensors and PIR motion sensors are both used for occupancy detection, but they differ significantly in performance and real-world applications.

Feature	PIR Motion Sensor	Zigbee Presence Sensor (Radar)
Detection Method	Detects motion (infrared changes)	Detects presence using radar reflection
Stationary Detection	❌ Cannot detect still occupants	✅ Detects micro-movements (breathing, posture)
Accuracy	Medium	High
False Triggers	Higher	Lower
Typical Use Cases	Basic lighting control	HVAC, smart offices, hotels, BMS
Automation Reliability	Limited	Stable and continuous

For modern smart building and HVAC automation projects, radar-based Zigbee presence sensors provide significantly higher accuracy and reliability compared to traditional PIR motion sensors.

Key Technical Advantages of OPS305 Zigbee Presence Sensor

• Doppler Radar Presence Detection (10.525 GHz)
Enables accurate zigbee presence detection by identifying micro-movements such as breathing, ensuring reliable occupancy sensing even when users remain still.

• ZigBee 3.0 Connectivity
Seamlessly integrates with standard ZigBee gateways and building management systems (BMS), supporting scalable smart building and HVAC automation deployments.

• Optimized Ceiling-Mount Coverage
Provides up to a 3-meter detection radius with approximately 100° coverage, making it ideal for offices, meeting rooms, and commercial environments.

• Reliable Operation in Diverse Environments
Designed to operate stably from -20°C to +55°C and up to 90% RH (non-condensing), ensuring consistent performance in real-world building conditions.

• Flexible Installation for Integration Projects
Compact ceiling-mounted design with Micro-USB 5V power supply allows easy installation in both retrofit and new construction projects.

Typical Applications

Smart Offices: Automate lighting and HVAC operation based on real-time occupancy, reducing unnecessary energy use.
Hotels & Hospitality: Control lighting and air conditioning in guest rooms or corridors for improved comfort and reduced cost.
Healthcare & Elder Care: Support monitoring systems where continuous presence detection is essential.
Building Automation: Provide occupancy data for BMS platforms to enhance energy analytics and operational efficiency.

Zigbee Presence Sensor Integration with Home Assistant

Modern smart building projects increasingly rely on open automation platforms such as Home Assistant to orchestrate lighting, HVAC, and energy systems. A Zigbee presence sensor becomes especially valuable when it can seamlessly integrate into these environments without proprietary lock-in.

The OPS305 operates as a standard Zigbee presence and occupancy device when paired with a compatible Zigbee gateway, allowing presence states to be consumed by Home Assistant-based automation logic. This enables system designers to trigger actions such as lighting control, HVAC optimization, or security workflows based on real-time human presence, rather than simple motion events.

By providing stable, ceiling-mounted presence detection, the OPS305 supports automation scenarios that demand higher accuracy—such as detecting occupants who remain stationary for extended periods, a common requirement in offices, meeting rooms, and residential living spaces.

Battery vs Wired Zigbee Presence Sensors for Ceiling-Mounted Installations

When evaluating Zigbee presence sensors, one common question is whether battery-powered models are suitable for ceiling-mounted deployments. While battery-operated sensors can work for basic motion detection, continuous presence sensing—especially radar-based detection—typically requires stable power.

Ceiling-mounted Zigbee presence sensors like the OPS305 are designed for permanent installations where reliable, uninterrupted operation is essential. Wired power enables continuous signal processing, multi-zone awareness, and higher detection accuracy without the limitations imposed by battery life or aggressive power-saving modes.

For smart buildings and long-term residential deployments, wired Zigbee presence sensors offer a more dependable foundation for advanced automation logic, reducing maintenance effort while ensuring consistent performance across multiple rooms or floors.

Zigbee Presence Sensors with Zone-Based Occupancy Awareness

Unlike traditional motion sensors that provide a simple “movement detected” signal, modern Zigbee presence sensors can support zone-based occupancy awareness within a defined space. By analyzing reflected radar signals, a ceiling-mounted presence sensor can distinguish activity across different areas of a room.

This zone-level awareness enables more refined automation strategies—for example, adjusting lighting intensity based on where occupants are located or selectively activating HVAC zones. In commercial and multi-room residential environments, this approach improves comfort while reducing unnecessary energy consumption.

How to Choose the Best Zigbee Presence Sensor for Smart Buildings

When selecting a presence or occupancy sensor, keep in mind:

Detection Technology: Choose Doppler radar over PIR for higher sensitivity and reliability.
Coverage Range: Ensure the detection area matches your ceiling height and room size (OPS305: 3m radius, 100° angle).
Communication Protocol: Verify ZigBee 3.0 compatibility for stable mesh networking.
Power & Mounting: Micro-USB 5V supply with easy ceiling mounting.
OEM/ODM Options: OWON supports customization for system integrators and large-scale deployments.

FAQ

Q1: How is presence detection different from motion detection?
Presence detection senses the existence of a person even when they are stationary, while motion detection responds only to movement. OPS305 uses radar to detect both accurately.

Q2: What is the detection range and mounting height?
OPS305 supports a maximum detection radius of around 3 meters and is suitable for ceilings up to 3 meters high.

Q3: Can it integrate with my existing ZigBee gateway or BMS?
Yes. OPS305 supports ZigBee 3.0 and can easily connect with standard ZigBee gateways and building management platforms.

Q4: What environment conditions can it operate in?
It works from -20°C to +55°C, with humidity up to 90% RH (non-condensing).

Q5: Is OEM or ODM customization available?
Yes. OWON provides OEM/ODM service for integrators and distributors who need custom features or branding.

Conclusion

OPS305 is a professional ZigBee ceiling-mount radar presence sensor designed for smart buildings and energy-efficient automation. It delivers reliable occupancy data, seamless ZigBee 3.0 integration, and easy installation — making it the right choice for system integrators, BMS operators, and OEM partners.