SONOFF SNZB-02D Zigbee Smart Temperature and Humidity Sensor

1. Introduction

The SONOFF SNZB-02D is a Zigbee smart temperature and humidity sensor designed to monitor your home's environment in real-time. Featuring a clear 2.5-inch LCD display, it provides accurate readings and can be integrated into your smart home system via Zigbee 3.0 gateways. This sensor supports app monitoring, smart scene automation, and voice control through platforms like Alexa and Google Home, helping you maintain a comfortable and healthy living space.

2. Package Contents

• 1 x SONOFF SNZB-02D Temperature and Humidity Sensor
• 1 x User Manual

3. Specifications

4. Setup

4.1 Battery Installation

1. Gently remove the back cover of the sensor.
2. Insert one CR2450 (3V) button cell battery into the battery compartment, ensuring correct polarity (+/-).
3. Replace the back cover, ensuring it clicks securely into place.

4.2 Mounting Options

The SNZB-02D sensor offers three versatile mounting choices:

• Stand: Use the integrated stand to place the sensor on any flat surface, such as a table or shelf.
• Magnetic Back: The sensor features a magnetic back, allowing it to be attached to metallic surfaces like refrigerators.
• 3M Adhesive: For non-metallic surfaces, use the provided 3M adhesive to securely attach the sensor to walls or furniture.

4.3 Pairing with a Zigbee Gateway

To integrate the sensor into your smart home system, you need a compatible Zigbee 3.0 gateway (e.g., SONOFF Zigbee Bridge Pro, SONOFF NSPanel Pro, SONOFF ZBDongle-P/E, or Alexa with Built-in Zigbee Hub).

1. Ensure your Zigbee gateway is powered on and in pairing mode. Refer to your gateway's manual for specific instructions on enabling pairing mode.
2. Open the eWeLink app (or your preferred smart home app compatible with your gateway).
3. Follow the app's instructions to add a new Zigbee device. This usually involves pressing and holding a reset button on the SNZB-02D sensor until an indicator light flashes, signaling it's in pairing mode.
4. Once successfully paired, the sensor will appear in your app, and its real-time data will be displayed.

5. Operation

5.1 LCD Display

The 2.5-inch LCD screen provides real-time temperature and humidity readings with large, bold numbers. It also features intuitive icons to indicate air conditions (Hot/Cold/Dry/Wet) and battery status.

• Temperature Display: Shows the current temperature in Celsius (°C) or Fahrenheit (°F).
• Humidity Display: Shows the current relative humidity in percentage (%RH).
• Air Condition Icons: Visual indicators for comfort levels.
• Battery Status: An icon indicating the remaining battery life.

5.2 App Monitoring and Notifications

Through the eWeLink app, you can monitor temperature and humidity remotely. The app provides:

• Real-time Data: View current temperature and humidity readings from anywhere.
• Historical Data: Access half-year free cloud storage to view hourly, daily, monthly, and yearly data trends. Data can be exported as .CSV files for analysis.
• Alerts: Receive instant notifications on your phone if temperature or humidity levels exceed your preset comfort range.

5.3 Smart Scene Automation

The sensor's temperature and humidity readings can be used as triggers for smart scenes within the eWeLink app. For example:

• Automatically turn on a humidifier when humidity drops below 40%.
• Activate an air conditioner if the temperature rises above a certain threshold.

5.4 Voice Control

Integrate the SNZB-02D with Amazon Alexa or Google Home Assistant for convenient voice control. Simply ask your smart assistant for the current temperature or humidity in the room where the sensor is located.

6. Maintenance

6.1 Battery Replacement

When the low battery icon appears on the LCD display or in the app, it's time to replace the CR2450 battery. Follow the battery installation steps in Section 4.1.

6.2 Cleaning

Wipe the sensor with a soft, dry cloth. Do not use liquid cleaners or abrasive materials, as this may damage the device or affect its accuracy.

7. Troubleshooting

• Sensor not connecting to gateway: Ensure the gateway is in pairing mode and the sensor is within range. Try resetting the sensor and attempting to pair again.
• Inaccurate readings: Ensure the sensor is placed in a location with good air circulation, away from direct sunlight, heat sources, or drafts. Allow some time for the sensor to stabilize after placement.
• No data in app: Check the sensor's battery level. Ensure your Zigbee gateway has a stable internet connection.
• Voice control not working: Verify that the sensor is correctly linked to your Alexa or Google Home account through the eWeLink app and that your voice assistant device is online.

8. User Tips

• Optimal Placement: For the most accurate readings, place the sensor in a central location in the room, away from windows, doors, vents, or direct sunlight.
• Battery Life: While the CR2450 battery offers a long lifespan, regularly check the battery status in the app to avoid unexpected disconnections.
• Zigbee Network Strength: If you experience connectivity issues, consider adding a Zigbee router (e.g., a smart plug or light bulb) between the sensor and your gateway to extend the network range.
• Data Export: Utilize the data export feature to track long-term environmental trends, which can be useful for identifying patterns or issues in your home.

9. Warranty and Support

For warranty information, technical support, or further assistance, please refer to the official SONOFF website or contact their customer service. Keep your purchase receipt as proof of purchase.