Infrared sensors create an invisible beam between two units. When someone walks through and breaks the beam, the system counts a person.
Advantages:
- Low cost and simple installation
- Battery-powered models available
- Good for narrow entrances (about 1–5 meters)
Limitations
- A bit lower accuracy in crowded entrances
- No advanced metrics like dwell time
- Not ideal for wide or open spaces
Best for small shops, offices, or libraries with simple entrance structures.
Camera-Based People Counting
Camera systems use video analytics to detect and count people and can also produce heatmaps and behavior data.
Advantages
- Wider coverage than basic infrared
- Detects direction of movement
- Heatmaps and behavior analytics possible
Limitations
- Accuracy depends on lighting conditions
- Privacy and GDPR concerns
- Needs stable power and internet
- Higher cost and more complex setup
Best for retail and malls where heatmaps and video analytics are required, but consider privacy rules and maintenance costs.
Radar People Counting
Radar sensors like SensMax TAC-B 3D-W (Wi‑Fi) and SensMax TAC-B 4G (built‑in 4G) use mmWave radar to track moving objects with high precision. They work in bright light, darkness, and difficult outdoor conditions.
Advantages
- Works in any light or weather conditions
- High accuracy, even in busy entrances
- Multiple counting lines and zones
- GDPR‑compliant (no filming, anonymous detection)
- Detects direction and speed (e.g., pedestrian vs. cyclist)
- Indoor and outdoor use (malls, airports, stations, parks, trails)
- Can store data offline and sync later
Limitations
- A bit higher price than infrared
- Requires power; internet via Wi‑Fi or 4G depending on model
Best for wide entrances, public spaces, smart city projects, and locations with strict privacy needs.
Which Technology Should You Choose?
- Small shops with narrow entrances: Infrared is often enough.
- Retail stores needing heatmaps: Camera systems can work, but complex installation and need to check privacy rules.
- Modern projects that need accuracy, privacy, and flexibility: Radar (e.g., SensMax TAC‑B) is the best choice.
At the End
People counting has evolved. While infrared and cameras have their place, radar sensors offer the best mix of accuracy, privacy, and flexibility. With SensMax TAC‑B sensors, you get reliable real‑time data indoors and outdoors, fully GDPR‑compliant.