Radar Sensor Applications in Smart Home Appliances | Human Presence Detection

Application Scenario Design of Radar Sensors in Smart Home Appliances

Radar sensors—also known as human presence sensors or radar ranging sensors—are referred to by various names. Their primary function is to detect behaviors such as target approach, presence, movement, and departure. Under different scenarios, they can be implemented with different application solutions. Today, we will discuss the application scenario design of radar sensors in small smart home appliances.

Application Scenario Design of Radar Sensors in Smart Home Appliances

1. Smart Juicer

• Detects a user approaching and automatically turns on the control panel lighting
• Detects fruit being placed into the juicing cup and automatically selects an appropriate juicing program

2. Smart Fan

• In addition to existing functions such as detecting human position to adjust oscillation and wind speed
• Uses radar sensing to infer the user’s perspiration level (estimated by combining temperature and humidity data), and automatically increases wind speed or adjusts airflow modes

3. Smart Humidifier

• Detects the user’s activity range within the room and adjusts the mist direction toward the user’s location to improve humidification efficiency
• Automatically reduces humidification output when no person is detected in the room

4. Smart Electric Kettle / Tea Station

• When a user approaches, automatically displays information such as water temperature and remaining heating time on the kettle’s screen
• When the user moves away beyond a certain distance, the screen turns off automatically to save energy

5. Smart Coffee Machine

• When a user approaches the coffee machine, the radar sensor is triggered and the machine automatically enters a preheating state
• Detects hand gestures within the operation area, such as waving, to start coffee brewing or switch between different coffee types

What New Experiences Can Radar Sensors Bring to Users?

Radar sensors can bring novel user experiences to smart home appliances by enabling contactless activation. Classic scenarios include “presence-based wake-up” and “absence-based sleep.” Taking a fan as an example, it can lock onto the user’s position and rotate to follow the user’s movement, much like a sunflower tracking the sun.

Recommended Radar Sensor: WT4101 Series

The WT4101 series radar sensors offer multiple versions adapted to different application scenarios. They support multiple frequency bands and human presence detection.

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