What Is a Motion Sensor and How Does It Improve Home Safety
A motion sensor is an electronic device that detects the movement of people or objects through changes in energy such as heat, light or waves, and uses that signal to make other systems work automatically — switching lights on and off, raising a security alert, or controlling appliances around the house. The technology is now widely used in homes, office buildings and smart home systems because it adds convenience, saves energy and reduces the risk of everyday accidents.
Today, as smart home technology plays a bigger role, motion sensors are no longer limited to ordinary security systems. They are also built into specialised equipment that demands a higher safety standard, such as home lifts. Cibes home lifts integrate these sensors as part of the system to keep users of every age safe, and are designed to meet the European safety standard EN 81-41 for today’s multi-storey homes.
What Is a Motion Sensor
A motion sensor is an electronic device that detects the movement of an object, person or animal within a defined range, then converts the detected signal into an action by another device — turning on a light, opening a door, sounding an alarm, or stopping a machine.
Today, motion sensors play a key role across many industries, including:
- Home security systems
- Automatic lighting systems
- Automatic doors
- IoT systems
- CCTV cameras
- Smart City systems
- Assistive devices for the elderly
- Factory machinery
- Home lifts, in particular lifts from Cibes Lift Group
The technology is popular because it raises safety automatically and reduces the risk that comes from human errors.
How a Motion Sensor Works
A motion sensor works by processing “changes” in its environment — heat, light, distance or wave frequency. The key types are set out below. When movement occurs, the sensor detects the change and sends a signal to the control system to trigger an action, such as switching on a light, holding a door open, or slowing a lift’s travel.
- Detects change (it does not capture images)
- Sends an electrical signal to the control system
- Operates in real time
- Sensitivity and detection range can be configured
How Many Types of Motion Sensor Are There
A black V90 home lift installed inside a house
Although every motion sensor shares the same goal of detecting movement, the underlying technologies differ in accuracy and in the situations they suit best.
1. PIR Sensor (Passive Infrared Sensor): Heat Detection
A sensor that detects movement through changes in the heat given off by the human body.
- Detects infrared radiation emitted by people or animals
- Low power draw, suited to continuous operation inside the home
- Stable, with a low chance of false detection
- Ideal for everyday living areas such as hallways, living rooms or staircases
2. Microwave Sensor: High-Accuracy Motion Detection
A sensor that uses microwaves to detect the movement of objects.
- Analyses the waves reflected back from a moving object
- Detects even without a heat source, such as solid objects or small animals
- More sensitive and with a wider detection range than a PIR Sensor
- Suited to areas near machinery, automatic doors, or systems that demand a high level of safety
3. TOF Sensor (Time-of-Flight): Distance Measurement With High-Speed Light
A sensor that measures the distance to an object from the time light takes to travel out and reflect back.
- Millimetre-level accuracy in distance measurement
- Distinguishes the position and spacing of objects in fine detail
- Reduces the risk of collision or entrapment in confined spaces
- Suited to systems that need in-depth safety, such as the doors or openings of a home lift
A Closer Look at How the PIR Sensor Works
The PIR Sensor is the foundational technology behind motion detection, designed to read “changes in heat” from living things directly.
What Is a PIR Sensor (Passive Infrared Sensor)
A PIR Sensor is a motion sensor that detects the infrared radiation emitted by a human or animal body. When an object whose temperature differs from its surroundings moves through the detection area, the sensor registers that change and immediately sends a signal to the control system, allowing devices to be triggered automatically — turning on a light or activating an alert, for example.
Strengths of the PIR Sensor
- Low power draw, suited to continuous operation because a PIR Sensor works by receiving the heat signal genuinely given off by a human or animal body, without emitting any wave of its own. It therefore uses very little power and suits systems that must stay switched on around the clock.
- Stable, with a low chance of false detection because it relies mainly on temperature difference, making it less affected by light or electrical interference — ideal for use in ordinary homes and buildings.
- Well suited to indoor and residential spaces thanks to its clearly defined detection field, which is why the PIR Sensor is widely used in hallways, living rooms and other areas with regular foot traffic.
- Affordable and simple to install since its straightforward technology keeps the PIR Sensor reasonably priced and usable in both basic setups and smart home systems.
Limitations of the PIR Sensor
- It needs a direct line of sight because it cannot detect objects hidden behind a wall or other obstruction, so the mounting position has a major effect on performance.
- Performance may drop in high-temperature environments because when the ambient temperature is close to body temperature, the heat difference narrows and detection accuracy can suffer.
Why Home Lifts Need a Motion Sensor
A Cibes Lift V90 home lift installed right beside the staircase
A home lift has to deliver both convenience and safety, especially in a house with elderly residents, young children or wheelchair users. Among Cibes home lifts, motion sensors are fitted to the cabin lift models — Cibes V90 and Cibes V70.
Without a Motion Sensor, a Lift Could Face Situations Such As
- The lift door closing while someone is walking past the entrance
- The door starting to close before a wheelchair or trolley is fully clear
- A child reaching out a hand or a toy just as the door is closing
- An elderly person entering or leaving slowly while the door is in motion
- A pet running in or out of the lift unnoticed
To prevent situations like these, Cibes has designed a “multi-layered sensor setup” (Multi-sensor Safety System)
| Sensor type | Best suited for | Use in Cibes lifts |
|---|---|---|
| PIR | Good for indoor areas | Detecting passengers around the lift |
| Microwave | High accuracy for doors | Preventing doors from striking obstacles |
| TOF | Premium capability, highest accuracy | Used in the Safety Edge + Auto Sensor system |
| Ultrasonic | More common in factories | Not needed for home lifts |
| AI Motion Detect | Predicts movement | May be included in Cibes OS in future |
Cibes home lifts focus on sensors built to European standards, primarily Microwave + TOF. If you want a home lift that is safe, dependable and right for everyone in the family, choosing a brand with a complete motion sensor system is the soundest investment you can make — and Cibes Lift is one of the strongest options available.
