1. Introduction
The WenzhiIoT Zigbee 24GHz MmWave Radar Presence Sensor is designed for advanced human presence detection in smart home environments. It accurately identifies human presence, static states (like sleeping), micro-motions, and general movement. This sensor also integrates luminance detection and a 16A relay, enabling comprehensive automation and control within your smart home system.
A Tuya Zigbee gateway is required for this sensor to function, providing a stable connection for all your Tuya Zigbee smart devices.
2. Product Overview
The sensor features a compact, circular design suitable for various installations. It includes a 24GHz mmWave radar for precise detection and an integrated 16A relay for direct control of connected devices.
Image 2.1: Top view of the WenzhiIoT Zigbee 24GHz MmWave Radar Presence Sensor.
The sensor is capable of detecting various human states:
- Human Presence: Detects if a person is in the area.
- Human Static: Identifies a person remaining still, such as sleeping or sitting.
- Human Micro-motion: Detects subtle movements, like breathing.
- Human Movement: Recognizes general motion within the detection zone.
Image 2.2: Functional detection scenarios, illustrating the sensor's ability to detect sleeping, talking, lying down, and even blinking.
3. Specifications
| Feature | Detail |
|---|---|
| Brand | WenzhiIoT |
| Model Number | MTG275-ZB-RL-24G |
| Connectivity | Zigbee 24GHz MmWave Radar |
| Power Source | Corded Electric (AC 85-265V) |
| Maximum Range | 10 Meters |
| Mounting Type | Ceiling Mount, Wall Mount |
| Integrated Relay | 16A |
| Luminance Detection | Yes |
| Compatible Hub | Tuya Zigbee Gateway (recommended) |
| Product Dimensions | 4.57"D x 4.57"W x 1.3"H |
| Item Weight | 4.2 ounces |
| Included Components | Presence Sensor, Double-sided tape, Expansion screws, Manual |
4. Installation
The sensor supports both ceiling and wall mounting. Ensure the power supply is disconnected before installation.
4.1 Mounting Methods
You can install the sensor using either double-sided adhesive or expansion screws. The back of the sensor provides designated areas for these methods.
Image 4.1: Back of the sensor indicating mounting points for expansion screws and double-sided tape.
- Ceiling Mount: Ideal for comprehensive room coverage.
- Wall Mount: Suitable for specific area detection.
4.2 Wiring Instructions
The device connects to an 85-265V AC power supply. It features an optional 16A relay function that allows direct connection to a light or other appliance.
Image 4.2: Basic wiring diagram for the sensor, including optional light connection.
Steps:
- Ensure the main power supply is turned off at the circuit breaker.
- Connect the Live (L) wire to the 'L' terminal on the sensor.
- Connect the Neutral (N) wire to the 'N' terminal on the sensor.
- Optional Relay Connection: If using the 16A relay to control a light or appliance, connect the load (e.g., light bulb) between the relay output and the Neutral wire. Refer to Image 4.3 for a detailed relay wiring diagram.
- Secure the sensor to the desired mounting location.
- Restore power to the circuit.
Image 4.3: Detailed wiring for the 16A relay function, illustrating how to connect a light for automatic control.
5. Operation and App Integration
The WenzhiIoT Presence Sensor requires a Zigbee hub (Tuya Zigbee gateway recommended) and the Smart Life/Tuya app for full functionality and configuration.
5.1 Pairing with a Zigbee Hub
- Ensure your Tuya Zigbee gateway is powered on and connected to your network.
- Open the Smart Life or Tuya app on your smartphone.
- Follow the app's instructions to add a new device. Select "Sensor" or "Presence Sensor" category.
- The sensor should automatically enter pairing mode upon power-up. If not, refer to the sensor's specific reset procedure (usually a button press).
- Once detected, follow the in-app prompts to complete the pairing process.
5.2 App Parameters and Settings
The Smart Life/Tuya app allows extensive customization of the sensor's behavior, including detection sensitivity, delay times, and relay modes.
Image 5.1: App interface displaying common parameter settings for the presence sensor.
Common Parameter Settings:
- Sensitivity: Adjusts the sensor's responsiveness to presence and motion.
- Departure Delay: Sets the time before the sensor reports "no presence" after detection ceases.
- Detection Range: Configures the maximum distance for detection.
- Entry Sensitivity: Fine-tunes detection upon entry into the zone.
- Entry Filter Time: Filters out brief, insignificant entries.
- Entry Distance Indentation: Adjusts the effective entry detection boundary.
- Shield Range: Defines a minimum distance within which detection is ignored.
- Block Time: Sets a period during which the sensor will not re-trigger after an event.
Image 5.2: App interface displaying control parameter settings for the presence sensor.
5.3 16A Relay Function
The integrated 16A relay allows the sensor to directly control a connected electrical load, such as a light. Three relay modes are available in the app:
- Standard (Cloud Linkage): The relay can be remotely controlled (turned ON/OFF) via the Smart Life/Tuya app.
- Local (Automatic): If human presence is detected, the relay will automatically turn ON. When no presence is detected, it will turn OFF after the configured delay.
- Not Support (Disable Relay): The relay function is disabled. The device operates solely as a presence sensor.
5.4 Luminance Detection
The sensor includes an illuminance monitor. This feature allows for smart scene linkage with other smart devices. For example, you can configure your house lights to turn ON or OFF automatically based on changes in ambient brightness, enhancing energy efficiency and convenience.
Image 5.3: Example of illumination detection in a living space.
6. Troubleshooting
If you encounter issues with your WenzhiIoT Presence Sensor, refer to the following common problems and solutions:
| Problem | Possible Cause / Solution |
|---|---|
| Sensor not detecting presence accurately or false positives. |
|
| Sensor not pairing with Zigbee hub. |
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| Relay not controlling connected device. |
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| Luminance detection not working or inaccurate. |
|
7. Maintenance
The WenzhiIoT Presence Sensor requires minimal maintenance to ensure optimal performance.
- Cleaning: Periodically wipe the sensor's surface with a soft, dry cloth to remove dust. Avoid using abrasive cleaners or solvents.
- Firmware Updates: Check the Smart Life/Tuya app regularly for any available firmware updates for the sensor. Updates can improve performance and add new features.
- Environmental Conditions: Ensure the sensor is operated within its specified environmental conditions (temperature, humidity) to prevent damage.
8. Warranty and Support
For warranty information and technical support, please refer to the official WenzhiIoT website or contact their customer service directly. Details are typically provided on the product packaging or the manufacturer's official online resources.
For app-related issues, consult the help section within the Smart Life or Tuya application.